On Wednesday 19 August 2020 17:52:39 Chris Albertson wrote: > I suspect that in the end you will need to design your own reduction > drive from a clean sheet of paper using what you learn from building > this. I think I'd make the gear teeth larger so that small printing > errors don't matter. > That also reduces the gear ratio. But I don't have that math handy other than to note I counted splines and decided it was a 30/1, but I am observing more than that I think.
I've made the second new flexgear at the same scale is the other, and according to my measurements to get full mesh, I need a wave bearing of 74.23mm so since I've lost the scale references for that part, but have made several bigger, too big in fact, I switched PLA spools for some white that I can write notes on, and reset the printer for a scale of 80.00 per mm, a std I can do math from, and its made the cap, with prelim measurements indicating it will be about 74.10mm so I'm already pretty close. The carrier I had in it, which is a hair too small, is 73.51, and a caliper stretching it to fit 100% at the apex's says I need 74.23. I should be able to assemble and test this one around 21:00. That 74.23 is a 2 point measurement, but this carrier has 6 bearings, 3 on each end. With the other 4 touching, 74.10 might be enough. I'm trying to conjure up a scheme to mount a good size rotron fan on the top frame bar to come on and blow down on the plate to speed up the glass cooling at the end of the job. The cooldown is a significant part of the production time for smaller parts like the bearing carrier > My plan with my plastic printed milling machine parts is to do a > boot-strap where I use the plastic machine to make metal parts. You > might have to do that same, use the plastic reduction units to make a > better one in metal. > > I'm wanting to try to make one of there using rubber timing belts as > gear teeth. There are some belt profiles that mesh with themselves Not without a cyclic velocity variation to deal with. One of the secrets to the splined design is very constant velocity because the "teeth" are all carrying load as they slide down the mateing side ramps of the saw tooth spline format. Thats primarily the reason I chose this project. Cycloid's share that but with all those bearings, bearing costs will eat your lunch. Thanks Chris. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
