Posted by Jim.ME on August 18, 2018 at 14:27:21 from (74.65.186.86):
In Reply to: Micrometer use posted by Bkpigs on August 18, 2018 at 12:32:31:
Your mic set looks good. Often some of the anvils or standards are missing.
The knurled collar on the right is to lock the spindle to hold a measurement, as someone said. Also as posted, the ratchet (knob) at the end is supposed to slip to give a consistent pressure so the readings are right. They are not fool proof and can slip early or hang up but help until one gets the feel of taking a reading. Many micrometers don't have them and many machinists won't use them even if the mic has one.
There should (and needs to be) be a nut at the extreme left to hold the anvils tight in the frame. Maybe it is there but it doesn't look like it, to me, in your photo. They use the same nut, often round with a knurled outer surface, with all four anvils. You calibrate each anvil to the proper standard (rods in the center) using the adjusting nuts on the inner side of the anvils, locking it with the outer nut before checking with the standard. If that nut is missing you might have trouble finding one, as the threads on the anvils may not be a pitch you find in a hardware store. Some of the B&S 55's had a set screw in the side of the frame where the anvil goes in and there will be a flat spot on the anvil that should line up with it when inserted. That should be just tight enough to keep the anvil from rotating when tightening the outer nut, and will not take the place of the outer nut. Originally there would have been a wrench or two to fit the adjusting nuts as well.
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