That's the reduction ratio of the unit I'm building for an X axis power feed for my mill . Input will be an HF 18v motor from a drill powered by an
18volt wall wart thru a PWM controller for speed control . Gearset is loosely copied from a Logan reduction gearset in my QCGB . 16t input gear drives a 48t which is pinned to another 16t which drives another 48 . Input and output are concentric , I'll be copying the drive dogs on the leadscrews for both in and output . So far I have the gears made and sideplates machined . I still need to make an axle and bushings for the 16/48 pinned pair , bushings all 'round , and the input and output shafts . I'm using 20DP gears cut from a JD tractor (from my 317 , badly worn) axle for the small ones and from a piece of 4140-type stock that used to be shipping bracing for a 5 x 12 foot CNC router table . Side plates are 1/2" aluminum stock , holes drilled then final machined with a shop-made boring head . In a little while I'll be out in the shop getting started on the in-out shafts and bushings . This will give me enough low speed torque for smooth slow feeds , with the top speed at 100RPM's at the output - I tried this motor directly coupled , but low speeds were jerky . Not all that fast , but a lot less work that cranking tha wheel by hand . The big benefit here will be much more uniformity in feed speeds and therefor much better surface finishes . Final configuration for controls hasn't been decided yet , but I do have everything but a DPDT reversing switch in hand . Coming next will be a belt driven feed for the Z axis , for those times when I use the boring head and need a very smooth finish . -- Snag- posted
8 years ago