topic Re: Interference in Inventor Forum

Interference

Anonymous — Sat, 13 Aug 2016 02:40:40 GMT

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.

Re: Interference

Mark.Lancaster — Sat, 13 Aug 2016 03:25:02 GMT

@Anonymous

Standard components from the content center are read-only and can not be changed unless you placed them into your assembly "as-custom" (and save them in your model location).

Re: Interference

JDMather — Sat, 13 Aug 2016 11:29:42 GMT

There is no problem.

Trying to override the size of fasteners is wrong.

Re: Interference

Anonymous — Sat, 13 Aug 2016 11:59:33 GMT

What will be the correct size of the fastener?

Re: Interference

JDMather — Sat, 13 Aug 2016 12:20:35 GMT

Fasteners should be covered in your textbook.

Do you own a Machinery's Handbook.

This information is now all over the internet if you don't have a book.

But maybe all of those tables are a bit too abstract.

You have used two different sizes (8-32 and 10-24) in your assembly.

Do this.

Go to the local hardware store and purchase these parts.

Try doing a real world physical assembly of these parts.

No student should graduate from a design course until they understand threaded fasteners.

Hands-on experimentation might be the best teacher.

Do you have access to a 3D printer at your school?

Does your school have a machine tool lab?

Go to the lab and ask whoever is in charge to help you manually thread a shaft and drill and tap a hole and then assemble the two parts together. In my opinion - any apprentice in this field should have to do this 8-hrs a day for 4 years before being permitted to design anything.

Re: Interference

Anonymous — Sat, 13 Aug 2016 12:23:21 GMT

I found a correct size.

Re: Interference

JDMather — Sat, 13 Aug 2016 12:28:51 GMT

@Anonymous wrote:
What will be the correct size of the fastener?

What do your instruction say.

Surely the instructions do not specify an 8-32 and a 10-24?

Re: Interference

JDMather — Sat, 13 Aug 2016 12:38:40 GMT

@Anonymous wrote:

I found a correct size.

Nope.

All wrong.

Entirely wrong.

Stop what you are doing and make a trip to the hardware store.

You need to get physical - real world - parts in your hands.

In this image from your parts -

what does the 8 mean?

what does the 12 mean?

what does the 32 mean?

what does the 24 mean?

Re: Interference

Anonymous — Sat, 13 Aug 2016 12:45:18 GMT

Only clue is given about the wing nut is in the BMO table.

Re: Interference

Anonymous — Sat, 13 Aug 2016 12:55:22 GMT

.875 - 9 UNC - 2A

.875 - Major Diameter.
9 - Number of threads per inch.
UNC - Type of thread.
2 - I am not clear about 2.
A - External Thread.

Re: Interference

JDMather — Sat, 13 Aug 2016 12:59:38 GMT

@Anonymous wrote:

Only clue is given about the wing nut is in the BMO table.

That is not a clue.

That is an exact specification.

What does the 10 in the 10-24 mean?

(and can you explain why you ignored this "clue" and changed it to 12-24?)

Re: Interference

JDMather — Sat, 13 Aug 2016 13:06:12 GMT

@Anonymous wrote:
.875 - 9 UNC - 2A

.875 - Major Diameter.
9 - Number of threads per inch.
UNC - Type of thread.
2 - I am not clear about 2.
A - External Thread.

This does not answer the questions in Post #8.

These are the wrong numbers for Post #8.

Answer those questions.

Specific to the numbers in Post #8.

Re: Interference

Anonymous — Sat, 13 Aug 2016 13:06:33 GMT

What does the 10 in the 10-24 mean?
---------------------------------------

This is referring to wing nut specification.

Re: Interference

JDMather — Sat, 13 Aug 2016 13:08:05 GMT

Where are the specifications for the Shaft part?

Where you given any instructions?

If you weren't given any instructions and the only "clue" you have is from the BOM for the Wing Nut - what size would the shaft be given this "clue"?

Re: Interference

JDMather — Sat, 13 Aug 2016 13:11:44 GMT

@Anonymous wrote:
What does the 10 in the 10-24 mean?
---------------------------------------

This is referring to wing nut specification.

What does the 10 mean?

(Hint: The correct answer will be a number. The correct answer will be found in a table of numbers that you have to look up.)

Your answer should be something like

A. The 10 in 10-24 means a Major Diameter of .....

Re: Interference

Anonymous — Sat, 13 Aug 2016 13:53:17 GMT

According to given wing nut specification I selected from content center but it is interfering.

Specification for the shaft is:

Re: Interference

JDMather — Sat, 13 Aug 2016 13:56:17 GMT

@Anonymous wrote:

Specification for the shaft is ...

Something is very very wrong then.

The specification for the threads must be identical for mating parts.

Ask your instructor which one you should use - or make an educated decision on which one your are going to use and then be prepared to explain to your instructor why you made an Engineering Change Order (ECO). (As part of your explanation for your instructor - I recommend that you go to the local hardware store and purchase the parts so that you can physically demonstrate why you had to make the change.)

(You should probably run your explanation past the experienced designers here first.)

BTW - you still haven't answered my questions in Post #8.

Re: Interference

Anonymous — Sat, 13 Aug 2016 13:57:52 GMT

I showed it to instructor he accept it but he didn't give any solution. That is what I am looking for.

Re: Interference

JDMather — Sat, 13 Aug 2016 14:10:24 GMT

You now know (because I told you) that mating parts must have identical thread specifications.
(But you shouldn't take my word for this (I could be clueless) - you should make a trip to the local hardware store and purchase some parts for experimentation.)

Because you know that - and because your instructor has not instructed your - you must make a decision on what size you are going to use (for both parts). (In the real world your supervisor will expect you to make many decisions about topics that the supervisor may or may not be well informed.)

What is your decision?

(BTW - You still haven't answered my questions from Post #8.)

Re: Interference

Anonymous — Sat, 13 Aug 2016 14:23:49 GMT

(BTW - You still haven't answered my questions from Post #8.)
-------------------------------

No 8, 12 referring to major diameter.
24, 32 - pitch value (TPI).

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