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Old Starrett locking thumb wheel

Frodge

Plastic
Joined
Jul 19, 2022
I have a question about a Starrett #230 I had acquired. When locking the thumb wheel, how far do you turn it to the right, and then how far to the left so you turn to unlock it. There are no markings or stops like the newer ones with the levers. It does lock and unlock, but there is no real way to know how far in either way I should be turning to fully tighten and to fully loosen.
 
I always just turn till it stops, and turn back till it is loose.

I serviced my old German indicator micrometer this week. With a little WD on the moving spindle, the indicator needle goes slow as molasses, till it dries..and then goes back to going fast .. likely near an air fit to the parts.

This kind, it is easy to get a few millionths when comparing to a JoBlock.
 
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Yeah, just turn it until the spindle is tight when locking. Back the other way until it's got no tension on it to loosen. There are generally no set positions. Some manufacturers' lock rings have a positive stop for the unlocked position, some don't. On all of them, tight is tight. That's the same for the lever versions also. When they're tight, they're tight, no set position for that.

Buck, I've got a Federal version of that micrometer, it's a neat old mic.
 








 
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