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Using pin gages

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Using pin gages Empty Using pin gages

Post by Bronko22000 07/02/22, 01:49 am

After looking at a recent post (bore size) I would like to pass along some knowledge I've learned from using various measuring equipment including pin gages for over 35+ years. Many times dealing with tolerances in ten thousands.
Calipers and micrometers give you darn accurate measurements (I prefer mics whenever possible) when calibrated but using pins is a bit different!
The case in point the OP was measuring the bore sise on his 58 cal muzzy.  He stated that the .582" pin fit the bore but the .583" did not go in.  He said based on this that his bore was .582".  
That is incorrect at least to a point. His bore is actually a bigger than .582". But for his intended purpose it is close enough. The minimum actual clearance for a pin gae is .0002".
You cannot get a .582 pin in a .582 hole.  
The same with flash hole size. If we consider .035" max, if we can put a .035 pin in the hole then it is actually bigger than .035! But again close enough.
I'm not lying guys.  Search it out yourself.
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Post by Admin 07/02/22, 08:18 am

My set of Pin Gauges are ZZ “Minus” which are .0002" undersized

Class ZZ Gages - ZZ gages have an inch tolerance of . 0002” and a metric tolerance of . 005mm. They are practical where good precision and speed are important.
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Post by Guest 07/02/22, 08:51 am

Idaholewis wrote:My set of Pin Gauges are ZZ “Minus” which are .0002" undersized

Class ZZ Gages - ZZ gages have an inch tolerance of . 0002” and a metric tolerance of . 005mm. They are practical where good precision and speed are important.

I agree with you. 2/10,000 is too minimal to even consider for muzzleloaders.

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Post by Bronko22000 07/02/22, 09:15 am

You are correct Lewis IF THEY ARE PURCHASED AS SUCH.  But the places I visited and used their gauges they were actual size.  That is why I posted this so people will know what they are actually getting.  Without using a hammer the largest pin you can put into a 1.000: hole would be .9998".
And Mustang you are also correct stating that .0002" in insignificant.  That is why I said its close enough.  I'm just throwing out some information here regarding use of pins.  But in the OP's thread his bore is likely closer to .583 than to .582. Possibly as large as .5828".  Precise measurements can only be made if you have a complete set of gauges.
Lewis for how much you're into perfection I'm surprised you don't have a CMM at your place....... Using pin gages 1139610133 Using pin gages 1139610133
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Post by Buck 07/02/22, 10:05 am



Interesting guys but only a few will go that fine.  Thanks.

Using pin gages Huntin33

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