Industrial Mechanic/Millwright (MIL)

2020 Guide - Fourth Period Package (29 Modules) Comments

Date: 10/6/2022 9:50:20 AM
Module: 160201a
Version: 24
Page: 11
Comment: The information should state that the pressure ratings are cold temperature ratings and the drawing on the bottom right has a type O. the classes should read 400, 600. 900,1500 and 2500.
Status: Declined

Date: 8/18/2025 3:38:25 PM
Module: 160401aA
Version: 1st
Page: 46
Comment: The second paragraph is repeating the inspection list on the previous page (45). Move this paragraph to the second bullet point on page 45. The second point should read "Check the cylinder.... and feeler gauge blades. As a rule of thumb, you should..."
Status: Approved for Review

Date: 8/18/2025 3:40:49 PM
Module: 160401aA
Version: 1
Page: 46
Comment: Figure 35 has an incorrect label on the image. The label "Underslung crank" should read "Main bearing cap for underslung crank."
Status: Approved for Review

Date: 11/10/2025 9:38:26 AM
Module: 160402c
Version: 1st
Page: 48
Comment: Second paragraph in the overspeed trip routine maintenance section. Last sentence needs to have the word "is" removed or the sentence be rewritten.
Status: Approved for Review

Date: 9/6/2025 6:35:40 PM
Module: 160403aB
Version: 1st Edition
Page: 11
Comment: The image in figure 12 on the right side has listed classes 400, 600, 300, 1500 & 2500. I believe this should reat 400, 600, 900, 1500 & 2500. Also the paragraph above this says that for the 1/16" raised face it is generally used for pressure classes up to 900 psi but the image in figure 12 on the left side shows classes 150, 250 & 300. This might need to be manipulated to include the 900 class? This does not seem very clear or accurate. Please update.
Status: Approved for Review

Date: 11/21/2025 8:52:40 AM
Module: 160404aA
Version: 1
Page: 13
Comment: First paragraph, last sentence. Remove the words "or fundamental" from this sentence. The sentence makes it seem that predominant frequencies and fundamental frequencies are the same things.
Status: Approved for Review

Date: 11/24/2025 10:24:10 AM
Module: 160404aA
Version: 1
Page: 21
Comment: The frequencies in the example that refer to figure 13 are all incorrect. The fundamental frequency is 29.67 Hz. The multiples are 59.33 HZ (2x), 89 Hz (3x), 118.67 Hz (4x).
Status: Approved for Review

Date: 9/6/2025 6:18:29 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 9
Comment: In step 5 on this page it has the wrong shim moves to correct this alignment. They should add 13.3 mils at S2 and 17.4 mils at S1. The reason these numbers are wrong is because in Figure 6 on page 10 they used the 9 mils at S4 from page 8. But on page 8 when calculating S4 they used the wrong number for the A dial, on page 7 in the text in step 1 and in figure 5 it shows A dial reading as +5 mils but page 8 uses 3 mils for some reason. Continued mistakes like this throughout this ILM are so frustrating. How can we expect students to keep using resources like these? How long will they continue to pay for poor resources?
Status: Approved for Review

Date: 9/6/2025 6:11:31 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 10
Comment: There are many issues with this graph in Figure 6, it needs to be completly replaced. The coupling centre labels at the top of the page should read B dial and A dial. On this graph there are those odd bold small vertical lines down the center that do not align with 5s or 10s, they are just in random locations, what are they? There is a pile of graph on the left of S2 and Right of S4 that is not being used. It is common practice to use an entire graph page to increase the size, readability and accuracy of the graph but this is just sitting there taking up paper. The scale numbers on all three lines are in between the lines so how can a person tell if it indicated the line above or below the number? The shim scales need a label for add or remove, or positive or negative instead of just all positive numbers everywhere. Why is the dial scale on this graph at all? Those numbers are not used for anything. The location of S2, S1, Coupling centers, B dial, A dial, S3 & S4 are all placed with no accuracy. The purpose of this graph is to VERY accuratly determine shim moves for an extremly precise alignment, putting lines on in the wrong place is not accurate. When building this graph with the wrong number for S4 from page 8 it makes this graph entirly wrong. The gear box line is at the wrong angle and so the shim numbers for this example on page 9 are entirely wrong. They should be Add 1.3 at S2 and Add 17.4 at S1. Why did you remove the Math only method of Face Face spindle shaft alignment from the last module? It was useful and didn't require knowing math and graphing to do the same thing.
Status: Approved for Review

Date: 9/6/2025 5:48:22 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 8
Comment: If you follow page 7 for the example they are trying to show there are many issues here. When trying to calculate S2 offset The correct measurement is 33" like listed on Line 5 (rear foot to coupling centre) but 3 lines down from there where it should be entered into the formula it is entered as 23", then the math is done using 23" resulting in -16 mils, But on the next line it says that the rear foot of the motor is 23 mils above the center line. So you use the wrong numbers to show the math but if you used the correct number it is -23 mils. On the two lines the numbers should be the same, but both numbers are wrong. When doing the math the correct number should be -23 mils. Then there is no explanation why when graphed on page 10 in Figure 6 this negative number goes up and why the positive number calculated for S4 goes down? On the bottom 1/2 of the page where calculating S4 They state the Face reading = +3 mils while showing on page 7 in the text and on Figure 5 that the face reading on dial A should be +5 mils. This gives us the wrong value for S4. With the correct number it would be 15 mils instead of 9. This causes the graph on page 10 to be completely wrong.
Status: Approved for Review

Date: 9/6/2025 5:35:14 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 6
Comment: Figure 4 on this page has a VERY bad graph and the whole thing should be replaced, but here are the issues I see with it. This graph should according to the description on page 5 be based on Figure 3 on page 5. The Labels 1, 2, 3, 4, Motor Dial and Gearbox Dial should be replaced with S2, S1, B Dial, A Dial, S3 & S4. The gearbox dial and motor dial labels are not nicely aligned with the lines they reference. The scale numbers for all 3 scales are not aligned with the lines they correspond to so its hard to determine which line is which value. There are odd bold lines in odd places all the way down the center of the graph (I at first thought they may indicate every 5 or 10 lines to help reading the graph but they are at random spacings). The coupling center lines on the graph are not accurately placed in relation to S2 and S3, they are close but this is an operation requiring attention to detail and accuracy. S1 and S2 lines are not properly located to show 20" where they should. A dial to S3 is also not accurate. The two dials are not accuratly spaced apart. S2 to the B dial line is not accurately placed. Why do we have to see the portion of the graph to the right of line 4 and left of line 1? It is proper graphing procedure to use the entire graph to increase accuracy. This Graph is EXTREMELY poorly built, this creates MANY challenges for students and needs to be replaced.
Status: Approved for Review

Date: 9/6/2025 5:17:22 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 36
Comment: The graph in figure 22 has issues. The TIR scale in the center should have negative numbers on the bottom half instead of positive on top and bottom. The Shim scales on both ends should have an add/remove or move left/right and a unit of measure depending on if this is a verticle or horizontal graph. The MTBM and Fixed Machines should be labeled on here. If this graph is supposed to be built bases off of figure 21 on page 33 then the distance from S4 to S3 should be 26" not 24", so where it is labeled 24" this is a typo.
Status: Approved for Review

Date: 9/6/2025 5:07:45 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 66, 62 & 64
Comment: This is the answer for Question #12 on page 62 but uses the graph on page 64 to get the answer. It asks for the thermal growth at FF, there are many issues here. First is there are 4 lines labeled with numbers but there is nowhere describing what these lines are for? What do these lines mean? The other issue I see is that there is only line 1 which is likely the Zero point and line 2 that cross the FF plain. According to the shim scale on the right side of the page this looks like 7 mil of growth but the answer in the answer key on page 66 says "C 10 mils". This needs to be corrected and more information added to the graph. Also the scales used on the graph have numbers on the sides between the lines so is the number shown for the line above or below the number? This is VERY poor graphing habbit and creates stress and confusion for anyone trying to read the graph and apply knowledge. Please revise the graph.
Status: Approved for Review

Date: 9/6/2025 4:51:17 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 18
Comment: Figure number 11 shows 3 angles for each example and has all 3 (60, 120 & 90) labeled as Minimum. This makes no sense. I believe that it was meant to say Minimum, Maximum & Ideal on both examples.
Status: Approved for Review

Date: 9/6/2025 4:48:10 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 7
Comment: In the description for step one on the last line it says "outboard feet (S2)". This is a typo, it should have been S4, in the image S2 is shown on the motor, while S4 is the outboard foot on the gearbox.
Status: Approved for Review

Date: 9/6/2025 4:43:15 PM
Module: 160404c
Version: 1st Edition May 2025
Page: 28
Comment: 1/2 way down the page there is a NOTE. In this NOTE the word unites is not correct. This should say units.
Status: Approved for Review

Date: 8/20/2025 9:51:46 AM
Module: 160404c
Version: 1st
Page: 18
Comment: Figure 11 has errors on the angle descriptions. Each side of the image should read "60° minimum, 120° maximum, and 90° ideal".
Status: Approved for Review

Date: 9/24/2025 12:22:31 PM
Module: 160404d
Version: 1st Edition May 2025
Page: 29
Comment: In question #14 part A it asks about a band saw. In the beginning of #14 the information does not include a band saw. The question describes a turbine pump.
Status: Approved for Review

Date: 10/31/2025 9:15:27 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 1
Comment: ILM 160405aC has information on safely locking out electrical systems. At the start of each of these four modules 160405aA, aB, aC and aD it states "The content of the electrical section in this course outline is not to suggest that a journeyperson millwright should complete tasks normally performed by journeyperson electricians. The intent is to provide the millwright with enough electrical knowledge so that they can make safe decisions when working around electrical and PLC equipment." If we are intending to develop safety skills why is safety left out of this module entirely? Should there be some basic electrical safety skills added to begin with?
Status: Approved for Review

Date: 10/31/2025 9:08:09 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 1
Comment: These electrical calculations can be challenging and frustrating for someone with no experience. Can you please add a page that summarizes all of the formulas used. Like a chart or formula page of some type?
Status: Approved for Review

Date: 10/31/2025 9:05:32 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 46
Comment: The Image in Figure #54 has an error. According to the solution given on this page R1 and R2 should be 0.5 ohms but the image shows 5 ohms for each. Please correct this image.
Status: Approved for Review

Date: 10/31/2025 9:03:20 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 46
Comment: On the last section of the solution the line with RT = 25 Ohms should be moved above the formula, to the line just below the line "Calculate the total amperage".
Status: Approved for Review

Date: 10/31/2025 8:57:27 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 33
Comment: In the Cross-Sectional Area paragraph at the top it uses the term "circular mils". There is no description of this anywhere in the module. Please add an explanation of what this means.
Status: Approved for Review

Date: 10/31/2025 8:31:36 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 32
Comment: The paragraph for factors affecting resistance should include the resistor's designed rating.
Status: Approved for Review

Date: 10/31/2025 7:55:12 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 32
Comment: The line under figure 39 says " Current flow determines the speed and power output of the electric motor.". This is very misleading. There are many factors that contribute to speed and power of electric motors. Some of these factors include Current, Voltage, Frequency, Efficiency, # of poles and MANY other design and engineering variables. At the bare minimum it should be corrected to "Current flow and voltage determine".
Status: Approved for Review

Date: 10/31/2025 7:43:14 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 31
Comment: At the end of the fourth paragraph it says " resistance is a useful method of achieving desired results and is a property to take advantage of". List examples of this to help clarify.
Status: Approved for Review

Date: 10/31/2025 7:39:58 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 18
Comment: The chart on the left side of Figure #24 needs proper labels to help understanding. What are the numbers across the top? They should be labeled "position of rotation in image to the right". The Y axis should be labelled "Voltage" and have values assigned to it.
Status: Approved for Review

Date: 10/31/2025 7:34:31 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 1
Comment: This series of module on Electricity and PLCs have MANY terms that require proper definition. Please add a glossary in this module. Like the one in the new Failure Analysis module.
Status: Approved for Review

Date: 10/31/2025 7:29:45 AM
Module: 160405aA
Version: 1st Edition May 2025
Page: 8
Comment: In Figure 7 on magnetic attraction and repulsion there is inconsistent arrows on magnetic flux lines. The bottom bar, top middle bar and top left bars are correct. But the bar at the top right is showing the flux lines coming out of the south end of the bar. Like the rest the flux lines would go into the south end. This needs to be corrected.
Status: Approved for Review

Date: 10/13/2025 7:02:07 PM
Module: 160405aA
Version: 1st Edition May 2025
Page: 51
Comment: Self test question #17 asks for total current but only give us resistance. With this information there is no way to answer the question. It needs the resistance to change to amperage, the question to ask for total resistance or the system must add 100V to the question to get the answer in the back of the book.
Status: Approved for Review

Date: 11/24/2025 3:08:20 PM
Module: 160405aA
Version: 1
Page: 45
Comment: Kirchhoff's voltage law formulae variables should be represented with E not V.
Status: Approved for Review

Date: 10/13/2025 6:55:29 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 42
Comment: The last line under the topic Running is incomplete. It simply says to run 5-10 minutes to allow excess grease to escape. It should then add to safely wipe off the excess grease that escaped. Install the vent plug, reassemble anything else that had been removed like guards and put back into service.
Status: Approved for Review

Date: 10/13/2025 6:51:57 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 36
Comment: Figure #32 shows virtually no useful information. Please replace with something helpful to understanding of this information. Perhaps something that shows the delta configuration that is most common with the three-phase three-wire system here.
Status: Approved for Review

Date: 10/13/2025 6:48:23 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 35
Comment: The first line says only the secondary winding is shown. What is this referring to? What does it look like with it shown?
Status: Approved for Review

Date: 10/13/2025 6:46:17 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 34
Comment: The math in the middle of the page calculates the resistance of 20m of wire. But it shows a formula for this that is not shown anywhere in the module. Describe the formula, where to find it, when to use it, how to use it and why it is required here.
Status: Approved for Review

Date: 10/13/2025 6:43:40 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 34
Comment: The current draw math example at the top has an error. It says the current draw is at 120V but then in the math numbers they use 240V. The line should be 240, not 120.
Status: Approved for Review

Date: 10/13/2025 6:39:29 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 24
Comment: The last line on the page uses the term current limiting. All terms used in the ILMs should have descriptions. Please explain what current limiting means as this is seriously important when talking about a safety device like a fuse.
Status: Approved for Review

Date: 10/13/2025 6:36:57 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 25
Comment: The Control Fuses section does not describe what a control fuse it, it is a definition that should be explained but there is nothing here on what this is. A control circuit is normally the low voltage, low current portion of a system, used to control the high voltage, high current main supply to heavy equipment. The label for Figure 19 Says assorted control fuses but the 400amp and 600amp 600V fuses are not control fuses. This image or description needs to be changed.
Status: Approved for Review

Date: 10/13/2025 6:20:17 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 17
Comment: The Danger Note at the bottom makes sense here but it should be added on Pg 5 as well in the safety section.
Status: Approved for Review

Date: 10/13/2025 6:18:04 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 16
Comment: The image in figure 12 has a broken junction box. The description says it was due to broken bolts. This is wrong, it is clear to see there was a threaded nipple holding the box to the side of the motor. The first paragraph mentions compromised conduits or electrical fittings causing grounding issues and moisture and dust concerns. What about the possibility of rodents, insects and birds that can get into our devices and cause more damage?
Status: Approved for Review

Date: 10/13/2025 6:16:06 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 12
Comment: The image in figure 12 has a broken junction box. The description says it was due to broken bolts. This is wrong, it is clear to see there was a threaded nipple holding the box to the side of the motor.
Status: Approved for Review

Date: 10/13/2025 6:13:54 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 12
Comment: The first paragraph mentions compromised conduits or electrical fittings causing grounding issues and moisture and dust concerns. What about the possibility of rodents, insects and birds that can get into our devices and cause more damage?
Status: Approved for Review

Date: 10/13/2025 6:09:03 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 12
Comment: The description of the image in figure #7 explains about multiple specific power supplies to the equipment. How can we find these numbers from this image? If I come across a sticker in the future that says more than one lice circuit is it those specific voltages, currents and the three-phase source?
Status: Approved for Review

Date: 10/13/2025 6:04:43 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 7
Comment: The opening disconnects section says to stand on the same side as the disconnect. There are many companies that have a policy that you stand on the hing side of the panel so if there is an arc/explosion the energy is directed away from you by the door as it swings open. What is the most safe method? Should we mention both or find out which one is safer?
Status: Approved for Review

Date: 10/13/2025 6:01:13 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 6
Comment: The image in figure #1 is supposed to be a good example of a clear workplace. Why is a photo of a workplace used when there is a bunch of debris laying on the floor? There is no equipment or boxes in front of the MCC panel but all the rubble on the floor should be swept up, this is still not safe or acceptable.
Status: Approved for Review

Date: 10/13/2025 5:56:40 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 10
Comment: It would make much more sense to move the last paragraph to page 20 as it is where they are talking about this topic.
Status: Approved for Review

Date: 10/13/2025 5:54:13 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 10
Comment: The first paragraph mentions locking the handle in the off postion. It would be much easier to understand if the image given had an example that shows how it can be locked out.
Status: Approved for Review

Date: 10/13/2025 5:49:42 PM
Module: 160405aB
Version: 1st Edition May 2025
Page: 9
Comment: The Control Power lockout procedure is not complete. What about locking out the disconnect? What if the system does not have a key?
Status: Approved for Review

Date: 8/7/2025 9:58:18 AM
Module: 160405aB
Version: 1st
Page: 21
Comment: The description of the single pole, single phase braker and the image figure 16 do not match. Figure 16 A shows the tripped breaker. Figure 16B shows the breaker ON. Figure 16C shows the breaker OFF. The image should be changed to match the procedure for resetting the breaker. Switch B and C.
Status: Approved for Review

Date: 11/2/2025 11:43:39 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 51
Comment: In figure 39 on rung #8 Td2 is labeled a 2 sec Dode. But on page 52 in Table 2, Line #8 describes this relay coil as delay on energize. On page 32 there are a list of abbreviations for time delay relays. The proper abbreviation for this relay should be TDOE but it is Dode. This image needs to be changed.
Status: Approved for Review

Date: 11/2/2025 11:40:20 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 51
Comment: In figure 39 on rung #5 Td1 is labeled a 5 sec Dode. On page 32 there are a list of abbreviations for time delay relays. The proper abbreviation for this relay should be TDOD but it is Dode. This image needs to be changed.
Status: Approved for Review

Date: 10/31/2025 11:32:30 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 62
Comment: The answer for number 6 cannot be logic. That would make the answer to the question read "Relay logic is called logic logic because the logic is determined by the wiring connections." The correct answer is "machine". The first sentence on page 37 describes this.
Status: Approved for Review

Date: 10/31/2025 11:26:47 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 59
Comment: Point #2 has a grammar issue. Remove "is" from this line.
Status: Approved for Review

Date: 10/31/2025 11:24:08 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 53
Comment: The section on Touch is very dangerous. It says problems with hydraulic hoses can be detected by touch. This is scary. If the problem with a hose is a leak, or if it happens to be leaking while under pressure and anyone gets their hand in the path of this leak, it will seriously injure them. In hydraulics in third year it is stressed for safety to never check for leaks with your hand. This needs to be emphasized. The danger bulletin in this section only mentions heat as a hazard, this needs to mention pressurized fluid as well.
Status: Approved for Review

Date: 10/31/2025 11:16:22 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 52
Comment: Table #2 in the top half for line No. 6 has DODE. On page 32 you show that the abbreviations for time delay on energize is TDOE and time delay on de-energize is TDOD. So this needs to be relabeled TDOD.
Status: Approved for Review

Date: 10/31/2025 11:11:43 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 51
Comment: Figure #39 has two outdated labels. On page 32 you show that the abbreviations for time delay on energize is TDOE and time delay on de-energize is TDOD. But on rung 5 it is labeled Dode, this should be TDOD. And on rung 8 the other relay is labelled Dode and should be TDOE.
Status: Approved for Review

Date: 10/31/2025 11:06:13 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 45
Comment: Third symbol from the bottom is a three-position switch. It is nice to show this. But there is no description or explanation anywhere in the module for this component. Please add information on this, what it is used for and what it will do.
Status: Approved for Review

Date: 10/31/2025 11:02:46 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 42
Comment: Figure 33 In this ladder diagram there is a circle near the right end of wrung #1. What is this symbol supposed to indicate? This is not complete and needs to be an actual symbol or removed from the line. I imagine it should be a relay coil but an empty circle is not complete.
Status: Approved for Review

Date: 10/31/2025 10:58:13 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 39
Comment: Figure 30 has a label for a symbol "Solenoid #1" but this is the wrong image for a solenoid. This symbol is supposed to indicate a fuse. The symbol should be replaced with a very similar image of a horizontal zig zag line that is used for a load.
Status: Approved for Review

Date: 10/31/2025 10:57:34 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 38
Comment: Figure 29 has a label for a symbol "Solenoid #1" but this is the wrong image for a solenoid. This symbol is supposed to indicate a fuse. The symbol should be replaced with a very similar image of a horizontal zig zag line that is used for a load.
Status: Approved for Review

Date: 10/31/2025 10:52:28 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 30
Comment: Figure 21 at the top there is an incomplete symbol. The empty circle should have a wavy horizontal line in the middle or possibly "AC" added to the center.
Status: Approved for Review

Date: 10/31/2025 10:49:20 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 29
Comment: Figure #20 should have the label modified. Please add "mechanical" to the description. Just to ensure that nobody gets this confused with a solid state relay.
Status: Approved for Review

Date: 10/31/2025 10:46:43 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 29
Comment: The paragraph in the middle of the page could have a couple initials added to help comprehend the description. Third line down between "contact" and "moves" add "A". Fourth line down between "contact" and "This" add bold "C"
Status: Approved for Review

Date: 10/31/2025 10:26:06 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 25
Comment: Figure #18 shows single break and double break switches. But there is no description of these definitions, when or why they are used.
Status: Approved for Review

Date: 10/31/2025 10:21:29 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 22
Comment: The third paragraph says that these proximity sensors have indicator lights. Some do not. This should read that may have a light.
Status: Approved for Review

Date: 10/31/2025 10:18:51 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 10
Comment: Why is there virtually no information on analog inputs? Please expand on these devices?
Status: Approved for Review

Date: 10/31/2025 10:12:20 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 12
Comment: Last paragraph of the page, There are many locations that use momentary switches and maintained switches. Keyed switches, Rope/Cable pull switches, and even keyboards could be a type of operator input control switch.
Status: Approved for Review

Date: 10/31/2025 10:05:47 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 12
Comment: Last paragraph of the page, last sentence, says joysticks can select one to eight different conditions. This is not accurate, there are joysticks that can have more than eight.
Status: Approved for Review

Date: 10/31/2025 10:00:39 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 12
Comment: Last paragraph of the page, There are not just 5 operator input control switches. There may be only 5 commonly but technology is advancing so rapidly this will not be accurate.
Status: Approved for Review

Date: 10/31/2025 9:56:10 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 11
Comment: On this page the Pulse Width Modulation section is not clear or easy to follow. The first sentence of the second paragraph says "PWM is a control technique that generates analog signals from discrete devices". This is very deceiving. This control technique will only generate a digital signal that mimics analog actions. A better sentence would be "PWM is a digital control technique that uses a digital (on/off) signal to simulate analog behavior by varying the average power delivered over time."
Status: Approved for Review

Date: 10/31/2025 9:21:55 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 10
Comment: In the first note on this page it states "a specific question, such as “is the temperature 100 °C?”" This should be changed to "the temperature ≥ 100oC?". The sensor would likely be open until the set point of 100 Celsius is reached and closed at any point above. So a greater than or equal to should be added.
Status: Approved for Review

Date: 10/14/2025 6:23:30 AM
Module: 160405aC
Version: 1st Edition May 2025
Page: 51, 52
Comment: In figure #39 on page 51 ladder rung #8 Td2 is labeled delay on de-energize (Dode) Then on page 52 in the description of what happens in this system (Table #2) Line #8 describes Td2 as "delay on energize". One of these is wrong and this is very confusing. On pages 32-35 they describe these timer relays as time delay on energize (TDOE) and time delay on de-energize (TDOD) but pages 51 and 52 keep using DODE (pg 52, table #2, Line #7) and Dode (page #51, Figure #39, Rungs #5 & #8) They should be using the same abreviations as earlier in the module (TDOE & TDOD) if these are the correct terms.
Status: Approved for Review

Date: 8/7/2025 10:02:56 AM
Module: 160405aC
Version: 1st
Page: 11
Comment: The first paragraph says variable frequency drives use PWM. This is not true. PWM and VFD are similar but not the same. PWM changes the DC "on" time while VFD changes the frequency of the AC power.
Status: Approved for Review

Date: 11/2/2025 12:33:36 PM
Module: 160405aD
Version: 1st Edition May 2025
Page: 27
Comment: On pages 26 and 27 they have descriptions of AND and OR uses. There should also be examples of NOT functions. It is mentioned on page 25 but there is nothing expanded on this.
Status: Approved for Review

Date: 11/2/2025 12:27:53 PM
Module: 160405aD
Version: 1st Edition May 2025
Page: 25
Comment: At the end of the second line in the first paragraph, where it says OTL for consistency add "(latch)". This will make it more clear and synchronize with later in the paragraph where it says OTU (unlatch).
Status: Approved for Review

Date: 11/2/2025 12:22:06 PM
Module: 160405aD
Version: 1st Edition May 2025
Page: 17
Comment: Figure 10 has some issues. It shows a Motor directly supplied from an output module terminal. Output modules are not designed to handle the current requirements and so the proper way to wire this is to add a contact or relay to the main power supply that is controlled by the output module. The output module is clearly labeled 24V DC and the image shows 24V AC connected to it. This is a serious issue that could result in harm to personal or damaged equipment. This image needs to be fixed.
Status: Approved for Review

Date: 11/2/2025 12:03:38 PM
Module: 160405aD
Version: 1st Edition May 2025
Page: 13
Comment: The Note at the bottom of this page says I/O modules typically have eight, sixteen or thirty-two input connections. I believe the second "input" should be removed. Also the newer PLC units are commonly using multiples of ten connections. So this needs to be adjusted and updated.
Status: Approved for Review

Date: 11/2/2025 11:57:19 AM
Module: 160405aD
Version: 1st Edition May 2025
Page: 12
Comment: On this page they describe many types of memory. But this is not straightforward. Where would a hard drive fall on this list? Please simplify and clarify.
Status: Approved for Review

Date: 11/2/2025 11:52:52 AM
Module: 160405aD
Version: 1st Edition May 2025
Page: 7
Comment: In figure 2 there are three places where L2 is labeled (identified). There is no description or explanation of what this means. Please add clarity to this information.
Status: Approved for Review

Archived Comments

Year: 2025

11/24/2025 10:14:17 AM
Module: 160401aA
Version: 1
Page: 19
Comment: Second paragraph. "In the case of shafts, the natural frequency is higher if the shaft is heavy and stiff." Remove the word heavy from this sentence. Mass decreases the natural frequency as described on page 20.
Status: Declined

Year: 2021

10/14/2021 10:22:56 AM
Module: 160404a
Version: 21
Page: 8
Comment: The end of the second paragraph mentions that figure 8 is an exploded view. It is not an exploded view. It should be changed to a cut away view. Also the description for figure 8 says exploded view and should be changed to a cut away view.
Status: Declined

4/6/2021 12:46:45 PM
Module: 160304b
Version: 21
Page: 16
Comment: The figure 17 does not match the descriptions in the points just above it. Example: Fig 17 C shows the off position but the description says it is in the on position.
Status: Implemented

3/24/2021 6:08:25 PM
Module: 160405c
Version: 21
Page: 8
Comment: The last bullet point on page 8 mentions that "double lane curves can maintain the minimum roller spacing at the outside of the curve." This is true only for staggered lane roller curves. See page 9 for reference.
Status: Declined

3/23/2021 4:33:00 PM
Module: 160405a
Version: 21
Page: 7
Comment: The top paragraph is difficult to understand or maybe incomplete. It should be reworded to make it easier to understand. Maybe something like: "If the receiving conveyor is positioned at an angle to the unloading conveyor, a side loading chute (figure 8) is required. The side loading chute requires space to redirect the material to the receiving conveyor, so there must be a greater height difference between the conveyors than the distance of an in-line conveyor. Because of the difference in height between the two conveyors, the material velocity and impact would be higher than that of an inline conveyor. To overcome this problem, baffles are installed in the chute to slow the material and direct it to the centre of the belt."
Status: Implemented

3/22/2021 12:35:38 PM
Module: 160405a
Version: 21
Page: 17
Comment: The last sentence of the page has a spelling error. It reads "slow-peed conveyors" but should read "low-peed conveyorth" so people with speech impediments can speak that part of the sentence without lisping.
Status: Implemented

3/22/2021 12:22:32 PM
Module: 160405a
Version: 21
Page: 17
Comment: The top paragraph on page 17 seems to have a word that is incorrect. The sentence "The method of ATTACKING rubber vulcanized plates has the advantage of..." should read "The method of ATTACHING rubber vulcanized...."
Status: Implemented

3/16/2021 12:38:42 PM
Module: 160201a
Version: 21
Page: 9
Comment: The last paragraph on page 9 mentions the procedure for finding the compression stroke. The last sentence is "...of the same cylinder by hand after the exhaust valve closes." It should read "...after the inlet valve closes."
Status: Implemented

3/15/2021 11:57:25 AM
Module: 160401f
Version: 21
Page: 11
Comment: Figure 9 missing
Status: Implemented

3/15/2021 10:27:17 AM
Module: 160401e
Version: 21
Page: 16
Comment: Figure 11 uses the word combination instead of combustion several times. Combination should be changed to combustion.
Status: Declined

2/10/2021 11:46:57 AM
Module: 160401a
Version: 21
Page: 24
Comment: In the description of the inline engine, a comparison of the number of bearings between a 6 cylinder and an 8 cylinder engine states that the 8 cylinder only has 5 main bearings. This should state that the 8 cylinder with 5 bearings would be a V8 arrangement not an inline 8, which would have 9 main bearings.
Status: Implemented

Year: 2019

1/1/2019 12:00:00 AM
Module: 160401h
Version: 7.3
Page: 9
Comment: The last paragraph states that: The easiest way to determine TDC compression stoke is to slowly rotate the engine crankshaft in the correct rotation until you can rotate both push rods of the same cylinder by hand after the *EXHAUST valve closes. To make this statement less confusing it should say after the *INTAKE valve closes. Because the last valve to close before compression would be the intake valve.
Status: Implemented

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