On Fri, 4 Jul 2014 19:45:31 -0500, you wrote: >That would be large enough to have some physical instability at high speed. >You could also have room to put a number of pickups around it and gain >resolution by reading them sequentially.
I have an encoder disk made of tufnel on my lathe - it's around 7" diameter 4mm thick. No problems at 4000 rpm. I only made it as I couldn't get hold of a low count encoder at a reasonable price and I had some lying around along with dozens of slotted opto switches. Nice thing is it's easy to machine, did the 120 encoder slots with a new disposable 3mm HSS 2 flute endmill in one pass, then the center and mounting holes and finally cut it out all with the same tool. The index slot is twice the length of the others and that opto is mounted further in than the A & B ones. Steve Blackmore -- ------------------------------------------------------------------------------ Open source business process management suite built on Java and Eclipse Turn processes into business applications with Bonita BPM Community Edition Quickly connect people, data, and systems into organized workflows Winner of BOSSIE, CODIE, OW2 and Gartner awards http://p.sf.net/sfu/Bonitasoft _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
