3D model hole size definition

[Booga]

I put a post over in another forum and it was suggested I should try here instead.
In brief my question is simple.
How do you decide on what hole size to put in your 3D models for standard drill sizes?

A more detailed explanation of my question is Here
Thanks,
Paul

http://www.martin-baker.co.uk/

 

[ewh]

Depends on tolerance.
Not just the tolerance on one piece, but all of the pieces being assembled, hole patterns, etc. You have to ensure that if all of the tolerances go to the small side that the fastener will still go through all of the intended holes.
I'm sure others here will elaborate better than I.


“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV

 

[TheTick]

The problem with the one-end-or-the-other approach to sizing in tolerance is that different processes have different requirements. Typically, you want MMC for machining and LMC for casting and molding.

Ideally, hole data and tolerance would be written and read in metadata associated with the hole.

Also, at this point in history, no competent manufacturer would simply rip parts from the model without double-checking tolerances.

 

[KENAT]

Hi Booga, if you past the thread ID that you see at the top of the page just under the title then you get this: thread31-339912

Many people here won't immediately click on a vague link due to security concerns etc. but if you actually link a forum folks are more likely to follow it.

Could I suggest other responders go over to that other post to read the full question.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​