I have just been given a junk Dunlap 6" lathe. I was surprised to find that they used a planetary gear reducer in place of the backgear. It is a neat little unit except it has a nice "window" in the housing. Now the window is great for figuring out how this little unit worked but with about 1/3 of the ring gear gone it doesn't work too well. Also exact number of neeeded teeth for replacement. Figuring it I came up with 96.6 teeth and while I have cut a few gears with partial teeth they don't seem to work too well.
Does anyone have a parts list for this antique and if so what is the number of the pot metal casting that contains the ring gear. It looks like a lot of work but might be able to make a new one but would sure rather find one.
In checking on planetary gears I find they recommend a 20째 pressure angle be used rather than the more common 14 1/2째 for the gears, sun and ring. Mostly for proper clearence on the ring gear teeth.