GD&T help
GD&T help
(OP)
Hello,
I need to know how to use GD&T to dimension a shaft(R=5, L=14) assuming two cases:
1) it will be mating inside a cylinder(already dimensioned and tolerenced)
2) it will not be mating with anything
Can anyone give me a general overview of what tolerencing I need for both cases?
Thanks
K
I need to know how to use GD&T to dimension a shaft(R=5, L=14) assuming two cases:
1) it will be mating inside a cylinder(already dimensioned and tolerenced)
2) it will not be mating with anything
Can anyone give me a general overview of what tolerencing I need for both cases?
Thanks
K





RE: GD&T help
It would seem that you are somewhat a novice to the world of ASME Y14.5 and a course would be appropriate.
RE: GD&T help
Yes I am a novice in GD&T, hence the reason for signing up to this forum and asking for some advice.
Maybe you could let me know what other input I would need to make a useful dimensioning determination?
K
RE: GD&T help
In your post, you inply there are 2 different setups. That requires some clarification too.
Even with that information you will need a basic understanding of the language before you can successfully apply it.
RE: GD&T help
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I would use runout or TP but without knowing how the mating part is toleranced it's a crap shoot at best. I suggest getting a good work book and the spec itself....or have your employer send you to training. GD&T training is well worth the investment even if you have to pay for it yourself. If that's the case I would consider it a good investment in your future.
Best Regards,
Heckler
Sr. Mechanical Engineer
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RE: GD&T help
All you need to do to make the shaft fit in the hole is to set the dimensions and tolerances to make the hole smaller. This is straight arithmetic. The ANSI fit classes will help you to work out appropriate clearances.
It sounds like you need some formal training. Perhaps you should take a look in a machinery's handbook.
JHG
RE: GD&T help
This GD&T is new to me...I studied as a mechanical engineer but never had to use tolerencing in any of my designs.
Machinist handbook sounds like a good idea...any suggestions?
-K
RE: GD&T help
All mechanical engineers should have a copy of the Machinist Handbook somewhere.
Chris
Sr. Mechanical Designer, CAD
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RE: GD&T help
As far as GD&T is concerned, getting a copy of the standard and some training would be very beneficial.