Calibrating an inside micrometer

#tools #machining

Hi everyone. I had this old Bowers internal micrometer offered in a non-working condition. In this video I will take it appart and find out how to calibrate it.

I hope this might help someone with a similar micrometer.

00:00 Introduction
00:27 Tool description
01:09 Condition check - out of calibration
02:43 Disassembly and inspection
06:46 Fixing spindle backlash
08:02 Reassembly
11:46 Calibration
15:28 Final check