reading powder measure micrometer
MonkTx
February 11, 2013, 08:53 PM
Hello all,
Stupid question time: I've had this measure forever but never really used it (prefer my Harrells) but now I find myself needing it so I am wondering how you read the mic on it to record settings. I know how I would read them but it may be completely wrong so I thought I'd ask the experts.
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ReloaderFred
February 11, 2013, 09:06 PM
It's only for reference once you get your charge set with the use of a scale. Since different powders have different densities, there isn't any way for a micrometer to tell you how much powder you're dropping by aligning the marks.
Hope this helps.
Fred
MonkTx
February 11, 2013, 09:22 PM
Apparently you're not familiar with recording your powder measure settings so you can quickly get back in the neighborhood of a particular charge.
rcmodel
February 11, 2013, 09:37 PM
Yes, you can't use it to measure powder charges.
But yes you can use it to record old settings, which I think is what you are asking??
Your first photo show a setting of probably 750.
It's hard to tell, because of the camera angle.
The second photo seems to show "I can't tell" because of the camera angle.
The think what you need to know is how to read a vernier dial.
Each full hash mark in an even number 600 - 700 etc.
Each division is 50. = 650 - 750.
Then the dial marker is divided into 5's with each small mark = 1.
So zero the dial on 0 on 50 on the inside sleeve and it is = 50.
Turn it a frog-hair further to the sixth little mark and it equals 50.1.
Turn it further to the middle longer mark between numbers and it equals 50.5., etc, etc.
Turn it a frog-hair further to the sixth little mark and it equals 50.6.
Let me tell you it's way harder to explain a vernier scale then it is to read it once you understand how.
See this:
http://www.linnbenton.edu/auto/day/mike/read.html
rc
Certaindeaf
February 11, 2013, 09:37 PM
It seems you just answered you own question.
MonkTx
February 11, 2013, 09:52 PM
rcmodel, that is exactly what I needed to know. Thanks, for your help.
ReloaderFred
February 12, 2013, 02:43 AM
I set all my powder charges with a scale, since different powder lots sometimes vary in density. And since I load for 30 different calibers, and many different bullets within those calibers, it's much quicker to just use the scale to set up for the next batch and not worry about what the last setting was for that caliber, and with five powder measures on my bench, I may not use the same powder measure again for that caliber/bullet combination.
As for your snide remark, I'll just ignore it and give you the benefit of the doubt.........
Hope this helps.
Fred
cfullgraf
February 12, 2013, 08:08 AM
and with five powder measures on my bench, I may not use the same powder measure again for that caliber/bullet combination.
That I will agree with. If you do not use the same measure from time to time, the calibration of the micrometers may not be the same. So recording settings may not be useful, even if the powder measures are the same model.
Generally, for a particular cartridge, I use the same powder measure. I have several powder measures, each are dedicated to a certain range of powder charges so the metering drums never get changed. By recording the setting, I can quickly get the metering cavity close to the desired powder charge, then fine tune it with a scale. From session to session, the micrometer setting is rarely the same for the same powder charge.
Walkalong
February 12, 2013, 01:46 PM
That is an old measure. They are marked a bit different these days. As others have posted, the number is arbitrary. Use a scale to get the thrown powder weight correct and record the micrometer setting for future use. Then you can dial right back to it when still using the same weight of the same lot of the same powder. Do double check it though.
brickeyee
February 12, 2013, 04:12 PM
"a vernier scale"
Looks like a micrometer scale, not a vernier.
There is only one index line for the smaller divisions, not a vernier set.
TexasShooter59
February 12, 2013, 10:10 PM
One thing I found with my Redding, is that after I disassemble to clean on a powder change, the previous numbers are no longer valid. But, my micrometer will move after a while of knock-knocking, so I record the number to check/reset it.
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