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Correct way to write the hole size

Correct way to write the hole size

(OP)
hi, All: We are using Class Z plus (+) and minus (-) gage pins to check the hole size, for example a hole size Ø.250±.002:

A. If pin gage Ø.251 (+) can go, but pin gage Ø.252 (+) cannot go, so the actual hole size on the inspection report is Ø.251 or Ø.252?
B. If pin gage Ø.251 (+) can go, but pin gage Ø.252 (-) cannot go, so the actual hole size on the inspection report is Ø.251 or Ø.252?
C. What is the correct way to report (write) the hole size inspected by plug gage test method? Any ASME standard to support it?

Thanks for all inputs

Season

RE: Correct way to write the hole size

Season,

Our inspection reports require the operator to list the inspection method used, or in some cases limits the inspector to a single tool. In your case, the inspection report would list the method as "pin gages" or similar.

If/when we have + and - sized gages, the measured value is listed as the gage size, i.e. .252- or .251+.

RE: Correct way to write the hole size

(OP)
Thanks for the reply, btrueblood.

I was heard the actual hole size on the inspection report should be one larger pin size, that means a measured pine size is Ø.251(+), then the actual hole size on the inspection report should be Ø.252, is that true?

Thanks

RE: Correct way to write the hole size

"I heard..."

Heard from who? On what basis?

I would suggest that you record "pin gage Ø.251 (+) can go, but pin gage Ø.252 (+) cannot go"

RE: Correct way to write the hole size

Maybe ASME Y14.43 would speak to this issue?

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

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