10/28/2022 0 Comments Jacobs gear hobber![]() ![]() teeth/Pitch Circle Diameter (PCD) = n/PCD = 80/4 = 20DP. They will and must also have the same pressure angle.Ī gear with a Pitch Circle Diameter of 4" with 80 teeth has a diametral pitch (DP) of no. If you make, buy or acquire the subject hobbing machine and don't have the hobs with the required 8mm bore (and diameter and length) you are going to have to seriously consider making them!!Īnd that is where "transititional screw-cutting" (with a "pi" or 22/7 element/component in it) needs to be addressed.įirst of all, all gears with the same DP have the same circular pitch which will equal the axial pitch of the spiral of that DP hobbing cutter required to cut/hob those gears. I dropped Gary an email asking him about availability of the hobs.And this is where it can "interesting" or you can dig yourself into quite a hole. I've got about a dozen commercial gear hobs of various sizes, and they all use a 1 1/4" arbor. Based on Robin's link, I'm guessing the Jacobs uses 8mm hobs? So there are no DP (Imperial) hobs available for the Jacobs kit? ![]()
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