epicycloidal gears

Tom Miller · 2006-02-09T08:58:41+00:00

One of the old steam rollers at the museum where I spend a bit of time as a volunteer,is up for restoration.We have removed the wheels and gear train covers to find that the final drive gears are badly worn. The pinion has 14 teeth and the bull gear has 72.. The bull gear is about 1160 mm diameter on the pitch circle. As we haven't removed the shafts yet, I don't have exact centre to centre distances. Looks like a straight forward exercise in gear cutting, except for one problem. The gears appear to be epicycloid in profile. The bull gear , we (I) intend to draw in a cad program and send a DXF file to a contractor with a CNC plasma pinion will have to be milled I think.. Anybody have any thoughts on if there are any standards for epicycloid gears? They were supplanted by involute profiles many years ago on just about everything but clocks. I've found a few web sites by Googleing , but any help will be appreciated.RegardsTom Miller

Feb 09, 2006 21 Replies

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F. George McDuffee 20 years ago

=================== Has anyone wirecut a cycloid gear?

Uncle George

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Tom Miller 20 years ago

"F. George McDuffee" wrote in message news: snipped-for-privacy@4ax.com...

Good Idea! It never occurred to me! I've already made a DXF drawing of the pinion and was going to check out waterjet cutting, but this would give a better finish.. Thanks

Tom

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