renderedchild
Mechanical
- Sep 10, 2008
- 8
I did a search and didn't come up with much, so if I'm asking a FAQ, please point me in the right direction.
What is the best practice for sizing parts in an assembly?
Say you have 2 parts, one goes inside of another. Specifically in my case 2 sheet metal parts that get welded together.
In the past I have been designing the parts to fit together perfectly, then once the design is complete going back and shrinking down the parts to allow for tolerances. So the part that slips into another part gets undersized by .040" per side in the solidmodel and on my drawing the dimensions call out +/- .040".
In this most resent project I've been working on I have many layers of sheet metal that get welded and weldments that get welded to weldments and so on. As I started going through my normal process of shrinking parts I realized that what I was doing was A. a pain in the ass, and B. probably technically incorrect.
So that got me thinking, what is the correct(best) way to model parts with assembly tolerances in mind?
Should I model all parts to be the exact dimensions I want them, then in my drawing define my tolerances as +0 / -.040" or some such?
How do you handle this issue?
Thanks in advance.
What is the best practice for sizing parts in an assembly?
Say you have 2 parts, one goes inside of another. Specifically in my case 2 sheet metal parts that get welded together.
In the past I have been designing the parts to fit together perfectly, then once the design is complete going back and shrinking down the parts to allow for tolerances. So the part that slips into another part gets undersized by .040" per side in the solidmodel and on my drawing the dimensions call out +/- .040".
In this most resent project I've been working on I have many layers of sheet metal that get welded and weldments that get welded to weldments and so on. As I started going through my normal process of shrinking parts I realized that what I was doing was A. a pain in the ass, and B. probably technically incorrect.
So that got me thinking, what is the correct(best) way to model parts with assembly tolerances in mind?
Should I model all parts to be the exact dimensions I want them, then in my drawing define my tolerances as +0 / -.040" or some such?
How do you handle this issue?
Thanks in advance.