- Joined
- Mar 22, 2014
- Messages
- 847
I picked up a very old Brown & Sharpe Model 48 1-2 inch micrometer for a price that I could not pass up. It is in decent condition but I don't understand how adjust (zero set) the reading.
The barrel and frame appear to be one solid part - the barrel cannot be rotated and there is no hole on the barrel for a wrench. I think there is a sleeve within the barrel and the spindle screws into the sleeve. There are two compression nuts - labeled A and B on the attached photos. I think the outer compression nut (B) is used to adjust for thread wear. I don't know what the inner compression nut (A) does, but I suspect it is used to make zero adjustments. I removed the nuts and tried to remove the sleeve but would not budge.
Can anyone explain how to adjust this thing? I'm perplexed.
The barrel and frame appear to be one solid part - the barrel cannot be rotated and there is no hole on the barrel for a wrench. I think there is a sleeve within the barrel and the spindle screws into the sleeve. There are two compression nuts - labeled A and B on the attached photos. I think the outer compression nut (B) is used to adjust for thread wear. I don't know what the inner compression nut (A) does, but I suspect it is used to make zero adjustments. I removed the nuts and tried to remove the sleeve but would not budge.
Can anyone explain how to adjust this thing? I'm perplexed.