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Old 08-10-2016, 10:45 AM
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Default need help reading mic

I just used my mic to find the shaft diameters of the extended reach tap holders. The larger shaft reads 4.0075 and the smaller one I read as 3.0076.

Can you guys check and or correct my readings out for me and tell me what drill size I should use to bore holes through the brass bushings?

I have "WHEELER ENGINEERING GUNSMITH LAPPING GRIT COMPOUND" I can put on the shafts to fit them if that is a good idea.

Thanks for your instructions and help.
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Old 08-10-2016, 11:14 AM
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Unless I am out of sugar both are wrong, what pic is the large shaft and what one is the small?
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Old 08-10-2016, 11:23 AM
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Quote:
Originally Posted by digr View Post
Unless I am out of sugar both are wrong, what pic is the large shaft and what one is the small?
digr the first picture is the smaller shaft.
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Old 08-10-2016, 11:27 AM
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Isn't the first one 3.865?
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Old 08-10-2016, 11:33 AM
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I read them at .3711 and .4711 and I can't understand how a tap holder could be over 3"
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Old 08-10-2016, 11:54 AM
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noting the tenths reads up to 5 not 10 as other mic's.

.3706
.46605

Assuming you do not have a metric mic.

The smaller lines on the mic shaft are .025 each so you add them as you go past, 0-, .025, .050, .075-. .100
Both readings are past two lines so you add each line .025 + .025 = .050
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Last edited by GWIZ; 08-10-2016 at 12:16 PM.
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Old 08-10-2016, 11:55 AM
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I think they are .3706" and .466". Those are not nominal sizes, but I haven't checked metric cross reference yet. Sent from my iPhone using SFT

9.41mm and 11.8364 mm. I would not think they are metric.

The .3706 is close to .375 or 3/8", could your mic be off a little. Do you have a 1-2-3 block that you can check your mic against?

The .466 is just not what I would expect from a machining standpoint, unless it is custom made to certain holes.
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Old 08-10-2016, 11:59 AM
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.3706" and .466

First one we have .3, plus two graduations on the sleeve, .05

Barrel (thimble) shows .020, plus a .0005 graduation.

Vernier scale shows another .0001.

Add up

.3
.05
.020
.0005
.0001

For a total reading of .3706".

Two thumb typing on a phone, as I never have time to use a computer!
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Old 08-10-2016, 12:04 PM
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Quote:
Originally Posted by digr View Post
I read them at .3711 and .4711 and I can't understand how a tap holder could be over 3"
I see your decimal point please allow me to blame it on my dirty glasses. Dollars, quarters and pennies got me again. I have to get a mic that reads in thousandth's, ten thousandths mics confuse the hell out of me.
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Old 08-10-2016, 12:15 PM
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Quote:
Originally Posted by greywynd View Post
.3706" and .466

First one we have .3, plus two graduations on the sleeve, .05

Barrel (thimble) shows .020, plus a .0005 graduation.

Vernier scale shows another .0001.

Add up

.3
.05
.020
.0005
.0001

For a total reading of .3706".

Two thumb typing on a phone, as I never have time to use a computer!
Thanks greywynd.
I have to study your way of figuring out how to read a mic... I makes more sense to me, "I think", than the dollar quarters and cents method I'm not so good at.
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