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How are holes dimensions on a cylindrical surface?

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JTLaflamme

Industrial
Feb 23, 2009
1
I am trying to check some drawings and I was never taught the proper way of dimensioning holes on a cylindrical surface. Like as if I were dimensioning the bolt holes for the top of a fire hydrant?
 
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Try forum1103

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]
 
Better in GD&T as ewh says but to get you started...

I'll assume since you posted in ASME forum that you're working to the current ASME drawing standard - 14.5M-1994.

As such, take a look at Figure 5-24. Don't get hung up on the use of composite position tolerance but the general dimensioning scheme may be of assistance.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:
 
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