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HELP, HELP, HELP !

HELP, HELP, HELP !

(OP)
Pin gauge.
if it is marked 1.000-, what the exact diameter it is?
no class is etched on it.
as I read, (-) means no-go. so it would be smaller than 1.000000". but by how much?
thanks.

RE: HELP, HELP, HELP !

Is there a "42" marked on it?

I'd guess 42 first...

Proud Member of the Reality-Based Community..

To the Toolmaker, your nice little cartoon drawing of your glass looks cool, but your solid model sucks. Do you want me to fix it, or are you going to take all week to get it back to me so I can get some work done?

RE: HELP, HELP, HELP !

(OP)
thanks for answering my question.
no additional marking except 1.000-.
chatted with Meyer, they are shop grade, no class.

RE: HELP, HELP, HELP !

It means it's a minus pin. It will be .0001"-.0002" under the stated size. So that one should actually measure .9998"-.9999" in diamter.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech

RE: HELP, HELP, HELP !

To assume what it measures is foolhardy and potentially costly. Have it calibrated if it's important.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: HELP, HELP, HELP !

ornerynorsk,

I don't know if that was directed at me but if it was, my post was not an assumption. I know what the - after the dimension means...100% sure.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech

RE: HELP, HELP, HELP !

No directed comments powerhound. Simply stating the fact that you asked what the diameter is, presumably it is an unknown at this point. It cannot be known by you or anyone on this forum unless you measure it properly, I don't care what's etched on it or what class it is. Of course a minus gauge should be smaller than the nominal listed, but why assume anything? I see people get into trouble all the time with uncalibrated tools and gauges. If you don't have a current calibration report, all you have is a chunk of hardened stock, nothing more.

I have a new micrometer standard that calibrated at 0.0041 over the factory-etched size. I keep it in my toolchest (tagged, of course) as a reminder never to assume anything.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: HELP, HELP, HELP !

Quote (ornerynorsk)

Simply stating the fact that you asked what the diameter is,

Where did I ask this?

Quote:

Of course a minus gauge should be smaller than the nominal listed, but why assume anything? I see people get into trouble all the time with uncalibrated tools and gauges. If you don't have a current calibration report, all you have is a chunk of hardened stock, nothing more.

All of this is outside the scope of what was being asked. He just asked what the minus meant. I told him what it meant. I also told him what the diameter SHOULD be. If it doesn't actually measure that then that's another question.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech

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