On Mon, 2010-11-29 at 14:43 -0500, Colin Kingsbury wrote: ... snip > It's not magic and won't make the machine > "more precise," but it would make it more fault-tolerant and that seems > significant.
Maybe not tolerant, but it's nice to get a warning when a step or two are missed and otherwise is not obvious. ... snip > Is this something that could be done just by wiring a few ~$50 encoders into > a parport, or would you need more specialized IO hardware? The only problem I can think of is the parallel port speed limit. If one has high resolution encoders or fast axes, the encoder pulses can swamp the parport. The fix here is to go to a hardware counter. The least expensive that works I think is the Mesa 7i43P, which has other advantages too. But the cost adds up when one starts to tack on an improvement here and there. I would tend to make sure that the motors, pulleys, drivers and power supply are up to snuff to begin with. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
