A knurling tool is applied to the piston, as it is held in the chuck of a lathe. The tool knurls, which means raises the surface of about 50 % of the surface of the piston. A knurled surface is like that of a brass handled screwdriver, you know, the ones that have 7 screw drivers, each threading into the next larger screwdriver, and the biggest threading into the handle of a hammer. If I didn't explain it right, Google Knurl, or knurling tool. The idea is to expand out the diameter of a worn out piston, a frequent "cheat" in days of old.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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