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MX | Off-Road Gear Info & Reviews
Primary Drive Aluminum Sprocket
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[QUOTE="Jaybird, post: 1022274, member: 22283"] LOL...I can't believe I left the playground without replying on this one. For something that points to the advantage of case hardening only the tooth profiles, concentrating on the working faces, I submit the quote below. Tsubaki is the largest chain manufacturer in the world. They have a good handle on what works and what doesn't in the way of chain drives. They are also involved in motorsports applications, so I provided their info instead of a sprocket mfg that may only concentrate on industrial applications, but their sprocket hardening practices are spot-on in line with Tsubaki's. [i]<font color="#0000FF">All U.S. Tsubaki sprockets are made from high quality steel. Since chain loadings are evenly distributed over all engaged sprocket teeth, tooth breakage or distortion is not normally a problem. [b]It is seldom necessary to use special high strength material.[/b] [/i][i]Sprocket diameter and pitch determine the specific material used.[/i] [i]The hardening process of small diameter, small pitch sprockets are usually a on-step procedure: heat treatment (electrical induction). Large diameter, large pitch sprockets can usually be directly flame hardened.[/i][i] [b]These methods are used to provide a high hardness at the wear areas, plus provide the ability of the tooth to absorb shock loads.[/b] This is accomplished by hardening only the wear area of each tooth while maintaining a ductile tooth core that is tough and resilient. The hubs and bores remain soft to permit reworking.</font></FONT>[/i] [url="http://www.ustsubaki.com/pdf/gen_catalog/gen_C72.pdf"]http://www.ustsubaki.com/pdf/gen_catalog/gen_C72.pdf[/url] The above PDF provides a hardness conversion chart. Compare the tensile stregths of the Ironman sprockets and you will find they are way up on the hardness scale. Way past what Tsubaki, or any other streel sprocket mfg recommends. Ironman is selling a gimmick, and the joke is on your chain. [/QUOTE]
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MX | Off-Road Gear Info & Reviews
Primary Drive Aluminum Sprocket
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