Interference

[Anonymous]

Interference is detected. I tried to change wing nut to “Major” option but I couldn’t because box is blank, there is no option to select. How to fix it?

Wing nut is placed from content center.

 

[JDMather]

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I am not in a position to take a decision because I am a novice.

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You absolutely must make a decision to pass my class.

Let's frame the question in another way.  We are driving down the road - you are a novice driver and I am the instructor.  A child darts out into the road in front of us. There is not possible for me to instruct you on what to do in the time that a decision must be made.  What is your decision?  (Hint: The correct answer is not, "I am not in a position to take a decision because I am a novice.")

Now make your decision!

No 8, 12 referring to major diameter.  
You are just guessing. This is not real answer - I already told you how to present the answer.

When you give your real answer (as opposed to guess answer) also provide the http:// url address to your Reference.

I already told you that you will have to look up the answers in a table - a chart of thread specifications.

Let me write this out and then all you have to do is fill in the blank.

The 8 in an 8-32 thread specification refers to the Major Diameter.  The Major Diameter is equal to .... (this is where you fill in the blank information).

The 10 in a 10-24 thread specification refers to the Major Diameter.  The Major Diameter is equal to .... (this is where you fill in the blank information).

[JDMather]

OK.

10 minutes has passed.  No decision made.

Let's limit the possible choices to those already mentioned in this thread.

8-32 

10-24

12-24

Now it is narrowed to a multiple choice decision with 3 possible solutions. (Hint:  None of the solutions are incorrect.)

Pick one of the three.

Make your decision.

[Anonymous]

I can't make any decision because now I am in a confused state. Let me go through each post again to clear the confusion.

[Anonymous]

The 8 in an 8-32 thread specification refers to the Major Diameter.  The Major Diameter is equal to .... (this is where you fill in the blank information).

--------------------------------------------

0.1640 inch \ 4.1656 mm

The 10 in a 10-24 thread specification refers to the Major Diameter.  The Major Diameter is equal to .... (this is where you fill in the blank information).

-----------------------------------------------------------

0.1900 inch \ 4.8260 mm

[JDMather]

OK, 

Now forget everything else and look only at Post #22.

What is your decision?

[Anonymous]

Let's limit the possible choices to those already mentioned in this thread.

8-32 

10-24

12-24

Now it is narrowed to a multiple choice decision with 3 possible solutions. (Hint:  None of the solutions are incorrect.)

Pick one of the three.

Make your decision.

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8-32 is for the shaft so it was ruled out.

10-24 is for wing nut but this interfering with shaft therefore it was also ruled out.

12-24 this was selected in post 6 but I was told incorrect.

Therefore no matching thread for wing nut in this option.

[JDMather]

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@Anonymous wrote:

.... (Hint:  None of the solutions are incorrect.)

---------------------------------------------------------------------------------

Therefore no matching thread for wing nut in this option.

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 I told you to pick one of them.

What is hard about that?

8-32 is for the shaft so it was ruled out.

Who ruled this out?  Not me?  What did I write?

Didn't I write that whatever size was used - the same size has to be used for BOTH parts?

10-24 is for wing nut but this interfering with shaft therefore it was also ruled out.

Who ruled this out? What happens if you push a screw into a nut without turning either?

Do they interfere or does the screw go through the hole in the nut?

12-24 this was selected in post 6 but I was told incorrect.

Why were you told this was incorrect wingnut for your 8-32 shaft thread.

Could it be because this is a basic violation of the stated rule that whatever size was used - the same size has to be used for BOTH parts?

Since you couldn't make a decision - I will make it for you and then walk you through understanding threads.

Since your shaft is 8-32 UNC, lets pick that size for both the shaft and the wingnut.

So to be clear - I have made the decision it is 8-32 UNC (later we will see what happens if I had selected either of the other 2 sizes).

Let me work up starting example - back in a minute.

OK,

Open the Shaft part.

Start a new sketch on the XY Plane.

Project Geometry the top side of the cylindrical face and the end face as shown (green lines in image).

Create a Polygon with 3 sides.

Add a Horizontal constraint to one of the sides.
Dimension with the equation shown.

[Anonymous]

This is what is coming. After that what to do?

[Anonymous]

There is a another problem as well. In the cross section I couldn’t see any cross section of thread.

 

[Anonymous]

[JDMather]

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@Anonymous wrote:

There is a another problem as well. In the cross section I couldn’t see any cross section of thread.

 

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No wonder you are having trouble understanding threads.  I thought we covered the topic of cosmetic thread representation vs modeled threads months ago.  I thought I instructed you to zoom wayyyy in on a cosmetic thread months ago.  The cosmetic thread is simply a picture wrapped around the shaft or hole - no real threads at all.

[Anonymous]

I was explained before without any image therefore it was unclear. You can see I didn’t mark any solution as a acceptable one. Now only it is understandable and marked acceptable ones.

A picture is worth a thousand words - JDMather

http://forums.autodesk.com/t5/inventor-general-discussion/cosmetic-threads/td-p/6362166

[JDMather · Accepted solution]

I am uploading a video that will be ready in a few minutes.

While it uploads - I recommend that you review this image from Wikipedia....

and this page.

I seem to recall having given you this same information for AutoCAD (see attached document) 6 mths ago.

Note that there is a minor error at the end of the video where the horizontal line extends past the triangle.

I simply trim or drag that back the triangle to fully constrain.

[JDMather · Accepted solution]

Now cut the physical thread and compare to the cosmetic thread.

Then attach the Wing Nut here and I will demonstrate how to cut the internal thread and then test the assembly of the two components.

There might be a bit of confusion in the video as Inventor refers to the Coil Height (for length of thread) where I used the name Thread_Height for the distance from the root of the thread to the crest of the thread.  Note that these are two different "heights".

[Anonymous]

This is an excellent video. This is a first time I come to know to convert cosmetic thread into model thread.

Thank you very much.

[JDMather]

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@Anonymous wrote:

This is an excellent video. This is a first time I come to know to convert cosmetic thread into model thread.

....

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Uhmmm, you posted link to YouTube video for doing this 6 mths ago?

http://forums.autodesk.com/t5/autocad-mechanical-general/drawing-nut-and-bolt/td-p/6041792

And I gave you written step-by-step instructions 6 mths ago.

The process is all the same.

When you attach your Wingnut here - I will show how to properly create and test the internal threads.

[Anonymous]

Is it a common practice to convert cosmetic thread into model thread if interference found?

[JDMather]

How many times do I have to write this, "Didn't I write that whatever size was used - the same size has to be used for BOTH parts?"

Because you still don't understand that both mating parts must be the same size - I recommend that you go to your local hardware store and purchase the parts so that you have something physical in your hands to test.

[JDMather]

Having trouble selecting the correct Wing Nut?

Hint:  If the shaft thread is 8-23 then the Wing Nut size must also be 8-32.

If the Wing Nut is 10-24 then the shaft thread is also 10-24.

See how this works now?

Two mating parts must have same thread sizes.

[Anonymous]

I am working with other assignments to meet the deadline. Having completed that I will return to this work. I have other one as well from you.