On Sunday 28 May 2017 08:20:24 John Thornton wrote: > I wish the BP knee mill Z was good enough to 3D print I'd give it a > try... I just need to get on with making the CoreXY printer. > > JT > Whats the problem with it John?
With the weight its carrying, I wouldn't think dropping 10 thou to put down the next layer would be a problem, even with an acme screw in it. All that should mean is that you'd need a 4x bigger stepper to lift it. This is much the same problem as I had in a scaled down size, with lifting the head on the g0704. It turned out that whoever suggested I replace the 1600 oz-in nema 34 with a 950 oz-in nema 34 was quite correct. The low current, very high inductance 1600 quickly ran out of torque going up, so about 27 ipm was the best it could do. Replacing it with a 960 oz-in 8 wire, and its driver and power supply with an integrated driver/$upply, and it can now do 70 ipm up the tower. And it runs 50F cooler doing it. So, since I had them, that motor and driver are on the Z screw of the Sheldon, where it can do even with some geardown in the timing belt, something it the 65 ipm range. But I am not impressed with the dm860 driver, its step to step size is plumb doofy, one step in the 8 its set for cannot be heard or felt, and now that the stuff inside the lid of the power electronics box will be gone, I'll have room for a taller auto-tech k6080 to replace it, 6 amps at 80 volts. I've around 65 volts to bang it around with, and I'll bet the improved smoothness will let it do 90 ipm. Now if I could do the same with the 8 wire, parallel configured nema 24 on the X screw, I'd be happy. Thats a small, unk pitch 8mm screw of unk make, and its out of steam and may stall with a 2/1 geardown, at 37 ipm. Same screw is on TLM's x, direct drive, does a g76 retract fast enough I can cut threads at 400+ rpms. But on the Sheldon, which will be turning slower most of the time, I traded speed for holding, or being able to program any taper I want by having enough twist to move it under cutting loading. > On 5/27/2017 8:54 PM, andy pugh wrote: > > On 16 May 2017 at 14:27, Gene Heskett <ghesk...@shentel.net> wrote: > >> Has anyone put a printhead on a std moving table milling machine, > >> and used it to do some 3d additive printing? > > > > https://www.youtube.com/watch?v=NEyL6cVWlo4 > > > > So, it clearly can work. > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
