On Thursday 24 July 2014 15:12:50 Marius Liebenberg did opine And Gene did reply: > On 2014-07-24 21:06, andy pugh wrote: > > On 24 July 2014 19:43, Marius Liebenberg <[email protected]> wrote: > >> Has any one done this before. I have a rotational fourth axis that > >> has a stepper and the rest of the system is servo based. Is there > >> an example or some direction from the coven? :) > > > > It should be straightforward, especially if 500 steps per second is > > enough. > > > > What hardware? > > I am going to put the stepper on the parport with a cheap bob. The rest > is 5i23 with 7i77. We have to swing the rotary axis at a fairly fast > pace as they want to cut 3D stuff with it.
That could be a limitation then. Most tables have a worm drive that may or may not be sloppy, and has something like a 90/1 ratio, so real speed means the motor must turn lickety split. I'd imagine you customer would be far better served with a custom belt driven table with a much lower "gear ratio" than a std rotary table. Tight timing belts will have better rotational accuracy than my own motorized POS $100 table can do. 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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
