Hello
I recently desired to reduce the cutting speeds on my Jet VTM 830 below the 210 RPM speed. I once purchased a back gear driven unit from a man in Augusta, Georgia for my band saw. It worked great but I couldn't find hide nor hair of him or the Dar-Jay pull-gear unit he was hawking. I thought I'd make one myself and found the internal ring gear to be an expensive proposition and a pita to machine so I sat on the idea. Then one day I realized Ive been dealing with int. ring gears all along in the form of gear couplings. I hunted one down and machined the gear free, at 5" P.D. it looked like a fit. I purchased the planetary and sun gear to match the ring gear Dim. 12 D.p. 60 T 20' Press. angle. It will have the original three step pulley config. with the gear arrangement on top. I should see a 3.333 to one reduction in rpm. I started with the gear set machining first. I'll try to load some pics up. I'm currently working on the pulley part. Theres a cooler that sits on top to lock it up one for one in rpm. When I remove the collar and install the stop rod it locks up the ring gear so the sun gear runs the planetary gears around its orbit. Thus driving the pulley at a reduced speed. Hope thats confusing enough.
Thanks
Johnny O
I recently desired to reduce the cutting speeds on my Jet VTM 830 below the 210 RPM speed. I once purchased a back gear driven unit from a man in Augusta, Georgia for my band saw. It worked great but I couldn't find hide nor hair of him or the Dar-Jay pull-gear unit he was hawking. I thought I'd make one myself and found the internal ring gear to be an expensive proposition and a pita to machine so I sat on the idea. Then one day I realized Ive been dealing with int. ring gears all along in the form of gear couplings. I hunted one down and machined the gear free, at 5" P.D. it looked like a fit. I purchased the planetary and sun gear to match the ring gear Dim. 12 D.p. 60 T 20' Press. angle. It will have the original three step pulley config. with the gear arrangement on top. I should see a 3.333 to one reduction in rpm. I started with the gear set machining first. I'll try to load some pics up. I'm currently working on the pulley part. Theres a cooler that sits on top to lock it up one for one in rpm. When I remove the collar and install the stop rod it locks up the ring gear so the sun gear runs the planetary gears around its orbit. Thus driving the pulley at a reduced speed. Hope thats confusing enough.
Thanks
Johnny O