On Mon, 2009-10-12 at 08:41 -0400, Gene Heskett wrote: ... snip > the edge. There isn't enough room to get any fancier than that in a 7x12's > head. It is installed between the two nuts that adjust the bearing pre-load, > and I'll need smaller opto assemblies to pull it off, the LMC piece, since > I'd need 3 of them, would be difficult to fit into the space available, so > I'm still in the thinking out loud stage.
One option might be to use a small timing belt running a separate encoder similar to: http://www.wallacecompany.com/cnc_lathe/HNC/00011-1a.jpg This way the optics can be sealed against chips and fluid. Another option I have considered, is to use Hall sensors which would work okay without an enclosure, but I seem to recall that Hall sensors are not very fast, though engine crankshaft sensors seem to work well enough. Another idea I haven't had time to pursue, is having two encoders, one low resolution for high speed, and one high resolution for low speed and rotary axis mode. The problem here is to figure out when to switch from one to the other. I suppose using a g-code word might work, leaving it up to the programmer to make the choice in the program code. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
