Thanks for all your help on this one. As a result I have improved performace a bit and maybe a more powerful z stepper driver will make it even better. Thanks again Aaron ----- Original Message ----- From: Gene Heskett Sent: 11/10/13 02:58 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] (no subject)Rotary problems
On Sunday 10 November 2013 09:38:22 andy pugh did opine: > As I appear to have been ignored... > > The problem probably is linked to the limited lookahead, but if you > only notice it when the rotary is involved, then it may be that the > rotary acceleration is much too low. > It is acceleration that limits how fast a particular segment is > allowed to run, and the lowest-accel axis will dominate. > > Angular axis acceleration numbers are relatively enormous as a > consequence of the units. Tens of thousands of degrees/s/s I didn't go that extreme, but I am likely too low too, I was considering that the table has no inertia since its geared down 90 times, and was more concerned with the added mass of the all steel couplings I had made, which probably weigh about the same as the 425 motor's armature, and are about the same diameter. Some day I should make a new motor mount, sized 2" shorter, and using one of the alu flex couplings which would be ounces lighter. I bought a pag of them on fleabay when I started on the lathe. But I would also insert ball thrust washers for worm end play which I do not now have. That made a large difference in how much movement power actually got to the XY tables. Using those, hidden in the bearing hubs on the xy tables, with factorylike 20 tpi 10mm acme screws, a stalled spindle will break off a 1/4 solid carbide end mill, ditto if it plugs up cutting dead soft alu. I need more spindle revs and horsepower, about 10x more, badly. 200 watt motor, 2500 revs wide open, sucks. Its a toy. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) It is indeed desirable to be well descended, but the glory belongs to our ancestors. -- Plutarch A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Re-Form Furniture Aaron Moore Conileigh Skinners Bottom Redruth Cornwall TR16 5DY Tel: 01209 890084 Mob: 07805686188 Email:aaronmo...@linuxmail.org Web: www.re-formfurniture.co.uk ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
