Here's some questions for the gear/sprocket experts -
I'm looking at chain and sprocket data for the size chain I use on our vintage race motorcycles - #219 cam chain in this case. Finding data on #219 chain is not as easy as more standard chain like #35. In fact it's been downright frustrating at times, but I think I may have figured something out.
I have found the sprocket charts and data at the Azuza website , as well as looking at sprocket cutter data on the Ash Gear website.
It looks to me like #219 chain might use the same involute sprocket cutter as #35 chain as the roller diameter is exactly the same at .200" but on a smaller sprocket pitch diameter and smaller pitch distance of .306" vs .315". Am I right in that? I've looked a lot and <never> found a 219 sprocket cutter - if I'm right that would explain it.
It appears that 428 vs 420 (and 415) chain might also use standard roller chain cutters but with adjustments as well - the 428 chain that is stock on our racers has a 1/2" pitch and roller diameter of .335", while 415 and 420 chains have 1/2" pitch and roller diameters of .306", with 415 being just narrower between the sideplates. Those would appear to use cutters for #42 british (.335" roller diameter) and #41 american (.306" roller diameter) on appropriate pitch diameters and pitch distances.
Any thoughts from the actual experts?