On Wed, 2008-04-16 at 12:27 -0400, John Kasunich wrote: > Kirk Wallace wrote: > > > > Thanks for your reply, Erik. I was wondering if there was a way to > > figure out the steps per revolution with the motors disconnected, but > > it's probably not important, because I can adjust settings after I get > > the motors working. Although, it would be nice to know to figure out > > what pulse rate I would need for my planned rapid of 100 inches per > > minute (with 5 rev. per inch screws). > > > > Small steppers (as in printers, etc) tend to come in all flavors. But > once you get into the kind of motors that are used on larger machines, > 200 step per rev is the huge majority. In your shoes, I would assume > 200 until proven otherwise. > > Regards, > > John Kasunich
Thanks John and Jon. While I was using the machine, it seemed I could dial in a least a half thousandth on the axis dials and the motors are directly coupled. There is .2" per rev. so at least 400 half thousandths or steps per rev. I must be missing something about steppers. So for 200 steps/rev: 100 inches/minute x 1 minute/60 seconds = 1.6667 inches/second x 1 rev./.2 inches = 8.3333 rev./second (500 RPM) x 200 steps/rev. = 1666 steps/second That seems a little low. It is well within parport frequency, though. Stepgen type eight seems to be what I need. I assume that for a direction change phase C and D sift two periods or a half wave? I could use an inverter chip to create phase B and D from type 2 but I don't mind using two more pins. I guess that could change. I found that the controller ground was +12 Volts relative to my scope probe, so I rigged up an optocoupler and it works well. Now, with another opto, I can scope out the driver IO. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/Bandit CNC) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
