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ball mill Salty Dog; Tuner's right, that is a method...but ball end mills of that radius will need to be specially ground, (= expensive), and your setup must be very rigid due to the shearing forces of a ball mill, so you will need a very good fixture. I prefer a contoured wheel on the...

40 lines per inch Nitetrane; I don't do much 40 line work, but 30 line is .025 deep, so I'd say metalman is on the money... Get an MSC catalog and look up Scientific Cutters. They 're carbide; a little pricey, but they are the best I've ever used.. very tough and durable.. Concentricity...

Well, Old Fuff; You and I have banged heads a time or two, but I must commend you on this one...that is a very good post. Jerry

1911 /S&W hammers Fuff; What's not similar about a 90 degree notch?? The same mechanical function takes place whether it is a 1911 or S&W. The notch on the S&W may be much shorter, but it is 90 degree, and the same.. S&W and Kuhnhausen recommend against stoning because it is impossible...

Chamber alignment Hawk; An observation over the years has been that the chamber circle (layout) is normally held to extremely close tolerances by S&W. The C/C distance rarely varies more than .001 which is quite good, so their quality control on the cylinders must be a priority. The...

Fixtures Hawk; There are none available commercially that I know of. Those of us that specialize in that work make our own... When stoning the trigger engagement area, we need to know the existing angular relationship. That relationship may need to be increased/decreased or remain as is...

Hammer push off Hammer push off may not be a product of amateur smithing. Often times, it is the hammer hook as it comes from the factory. As tooling wears, the inside corner is often not as sharp and square as it should be. The hook itself is very short;. . It doesn't take much of a radius...

Extractor rod run out Andrew; The extractor rod can have a large effect on the felt trigger pull. I use a Ron Power fixture to bring the TIR down to absolute minimum. The locking end of the rod is also squared and counter bored to match the angle of the locking plunger and if needed, the...