On Sunday, August 29, 2010 11:38:12 pm Igor Chudov did opine: > Guys, would you recommend some inexpensive encoder type hand controls? > I would like to control "speed override" with a rugged encoder type > rotary control. > A thought that I have played with in my mind, and gone as far as to order a few parts, is to use a more or less std small stepper motor with 12 or 24 volt rated coils, as an encoder by feeding it to a pair of comparators which should give a quadrature A & B output. I haven't worked out a 100% reliable method of protecting the comparator inputs from the over-voltage a fast spin of the knob on the motor shaft would feed them, nor have I worked out the most reliable hysteresis feedback to prevent low level vibrations and such from outputting spurious signals. But, based on the fact that the average $3 stepper motor is also a heck of a good generator, I see no reason why it couldn't be done.
Suitable stepper motors can be had for small change. I have a box that I was going to use that would hold one encoder/motor for each of the 4 axis's I have, a bit big, but with one knob per axis I think it would be more usable than a game pad that I have hooked up now. A 5th motor could be installed for feed rate control, and a 6th for spindle speed is not a huge problem a long as I could get some help with the hal stuff. But my box would be pretty crowded by the time I shoehorned 6 of the motors I have right now into it. So its an idea I'm tossing out because I could do all 6 of those for less than a single pendant with one dial at the current prices. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) You will be divorced within a year. ------------------------------------------------------------------------------ Sell apps to millions through the Intel(R) Atom(Tm) Developer Program Be part of this innovative community and reach millions of netbook users worldwide. Take advantage of special opportunities to increase revenue and speed time-to-market. Join now, and jumpstart your future. http://p.sf.net/sfu/intel-atom-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
