C
C.M.
Guest
Has anyone any advice to get started lapping brass cylinders of about 0.665 dia and matching monel steel pistons for a trumpet ? These are through holes, about 4 inches in length. I have a decent lathe and mill. The suppliers of laps want several hundred dollars in start up tools. Is there a way to make one's own laps ? They have to be finished to a tolerance of about +/- 0.0002