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Thread Gauge


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14 minutes ago, workmantm said:

Quick answer: Yes 

 

long answer: the no go requirements are the same for 3B and 2B. The go member has different tolerances. 3B being a tighter tolerance can be used to buy a 2B requirement. 

 

46 minutes ago, MIL-TFP-41 said:

Yes, A 3B gage is a tighter tolerance than a 2B.

Specifically the "GO" pitch diameter is the same. The "NO GO" pitch diameter on a 3B gage is smaller than a 2B gage

 

 

Thanks. That is what I thought seeing as the 3B is the tighter tolerance. Just was not sure if common sense ruled with pitch diameters.

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Response from Vermont Gauge tech support. Emastercam tech support spot on again. :D

Quote

Brian,

 

The simple answer is, yes. You may use a 3B gage to inspect a 2B thread. See the attached illustration to better understand why. The same would not be true for a 2B gage used to inspect a 3B part. You will be surrendering a portion of the upper your manufacturing tolerance using the 3B gage. From a cost standpoint, the only gage you really need is the 2B No-Go member. The Go gage for a 1B, 2B or 3B is the same gage. For this reason, many gage manufacturers only mark the Go Plug gages as “Basic” instead of 1B, 2B or 3B.

 

Wall Chart CYL-THD Final 8-15-11 2.pdf

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3 hours ago, MIL-TFP-41 said:

Yes, A 3B gage is a tighter tolerance than a 2B.

Specifically the "GO" pitch diameter is the same. The "NO GO" pitch diameter on a 3B gage is smaller than a 2B gage

 

yes you can - but if your 3B NOGO enters the hole it doesn't mean that the part is reject. It may still meet 2B requirements... 

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On 12/8/2017 at 10:16 AM, workmantm said:

Quick answer: Yes 

 

long answer: the no go requirements are the same for 3B and 2B. The go member has different tolerances. 3B being a tighter tolerance can be used to buy a 2B requirement. 

sorry but this is partially wrong, The go member is the the same for 2b and 3b, the no go is the one that is different. You are right though about using a 3b top check the nogo on a 2b thread.

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