Symmetry Around a Triangular Part 1

[Oaklandishh]

Hey guys,

Let me preface this with I don't have much experience with in depth GD&T I haven't had instruction in it in years and that was not very in depth.

I have a part that is an equilateral triangle with some other features added. I want to avoid dimensioning all three sides of the triangle if I can, because the drawing gets really cluttered really fast and many features are the same distances about the center hole rotated +-60deg. Because its a triangle and symmetric about 60deg increments I am not sure how I am supposed to go about dimensioning the part such that its clear the other arms of the triangle are the same dimensions

I looked online for information about GD&T on symmetric things, but I couldn't find anything close enough to what I wanted.

Can I just say the dimensions are typical as I did in the example simplified drawing I attached?

Any advice or resources are appreciated.

Thanks.

http://i.imgur.com/EmxY9F2.jpg

 

[Oaklandishh]

I forgot to attach the picture just in case.

 

[CheckerHater]

Using "TYP" designation is generally considered Faux Pas.

Your have petty clear case of "repetitive features" and using multiplier "3X" should do just fine.

 

[Oaklandishh]

Thanks,

That seems like what I was looking for.

 

[Tunalover]

As an aside, use of TYP is not condoned by Y14.5 or Y14.100. It's much more clear to use a multiplier e.g. 4X. I think that if it MUST be used then only when the number of occurrences is hard to count like with fillet radii in a complex molded or cast part.



Tunalover

 

[SeasonLee]

For a symmetric part on your case, here is an example for your reference. As for the three holes on the tabs, you can call out the position FCF with the same way as shown, but need to change 3.08 TYP to Ø6.16 pitch circle.

Season