mynoseisbrown&sh
Plastic
- Joined
- Dec 4, 2019
Brown & sharpe #24 crazy dual knob micrometer. Its in great shape on ebay item # 164297594393 if your into cool rare tools this thing might make you smile.
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Cool. How does it work?
I can't wrap my head around how you would use it, the ratchet thimble is throwing me off. I'm guessing you start by ratcheting onto the part like normal, but then what effect does turning the tenths dial have? Is it trial and error?... turn the tenths dial a little at a time until you get a reading with the marks lined up?
You probably set the thimble to size, then use the second thimble to back off the barrel to line the mark up exactly with a thousanths mark and then you read the vernier to determine the tenths.
If you think about measuring something that is on the half a thou, the mark will be half way between thousanths ticks. Rotating the barrel will rotate it half a thou so that the 5 on the vernier will like up.
Steve
Looks like a similar design (in precision..?) to one of these -
Starrett T221XL High Precision Micrometer 0-1" Range Carbide
I worked with a guy that had one, but I didn't quite grasp the concept over a regular tenth vernier reading mic.
Steve, you are absolutely correct according to the inventor's patent application where he lays out this mike's advantages and how it operates.You probably set the thimble to size, then use the second thimble to back off the barrel to line the mark up exactly with a thousanths mark and then you read the vernier to determine the tenths.
If you think about measuring something that is on the half a thou, the mark will be half way between thousanths ticks. Rotating the barrel will rotate it half a thou so that the 5 on the vernier will like up.
Steve
Steve, you are absolutely correct ...
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