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===Re-grinding pawl ring/gear ring dogs=== | ===Re-grinding pawl ring/gear ring dogs=== | ||
This is best accomplished with a small sharpening stone, light oil, and a ton of patience. The idea here is to reface the dogs to be perpendicular to each other and thus eliminate the tendency to cam out against the spring. Be careful to check the fit of the gear ring with the pawl ring before reassembly, and do not remove too much material, since the parts are case hardened, not through hardened. The case depth with carburizing methods typically used by such parts is seldom very deep, and therefore this regrinding method may not last very long. (I have heard that Sturmey-Archer used the sodium-cyanide bath method of carburizing; according to my information, this method produces what is known as superficial hardness — the case depth may be only a few thousandths of an inch) | This is best accomplished with a small sharpening stone, light oil, and a ton of patience. The idea here is to reface the dogs to be perpendicular to each other and thus eliminate the tendency to cam out against the spring. Be careful to check the fit of the gear ring with the pawl ring before reassembly, and do not remove too much material, since the parts are case hardened, not through hardened. The case depth with carburizing methods typically used by such parts is seldom very deep, and therefore this regrinding method may not last very long. (I have heard that Sturmey-Archer used the sodium-cyanide bath method of carburizing; according to my information, this method produces what is known as superficial hardness — the case depth may be only a few thousandths of an inch)<ref>Aus dem [https://amzn.to/3oxVABc Machinery's Handbook 24th ed., Robert Green, Industrial Press, 1992 (Partnerlink)]</ref> | ||
I am also experimenting with a reverse-taper grind and face texturing of the dogs to help keep them in contact under load. Results will be posted here at a later date. | I am also experimenting with a reverse-taper grind and face texturing of the dogs to help keep them in contact under load. Results will be posted here at a later date. | ||
===Polieren=== | ===Polieren=== | ||