Dave wrote: > > If you have a big gantry, you don't want to have to rotate the motors or > encoders to get the index pulses aligned. > > Consider a gantry that has 1+ kw motors on each side of the gantry with > gearboxes and encoders integral to the motors. > > That would not work. > So, your solution is to allow the motors to move, independently, to their index positions, which could randomly be up to 1/2 shaft rotation apart, and then move to the correct home offset for each side? Well, I think that won't work, either. The two sides of the gantry must always be kept aligned within a small difference from the rest position at turn-on. I am sure there are ways to align the two sides of the machine so the index marks are nearly equal. Slipping the pinion a few teeth (May require removing the pinion from the shaft) should be able to get it close. Many encoders have slots to slip the encoder angle for these adjustments, or to slip the shaft coupling at the encoder. But, my guess is that the machine is ALREADY well-aligned, and that only needs to be verified once before powering up.
Jon ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
