Messages

1

FAQs / Re: Step and Dir signals

« on: May 14, 2010, 08:44:27 PM »

Thanks. 
Also, what is the state of the dir pin when the motor is not supposed to turn?

2

General Mach Discussion / Spindle Control Pins

« on: May 14, 2010, 08:40:44 PM »

Is there a way to prevent Mach 2/3 from sending a PWM signal to the spindle?  I am using a relay that will die if it is being constantly switched on and off by a PWM signal.  I only want the relay to turn on or off, thus a simple high or low should come from the step pin.  The motor has its own speed control. 

Thanks,
Nishant

3

Mach4 General Discussion / Re: New people welcome !! Come in here and introduce your self!

« on: May 14, 2010, 01:03:50 AM »

I am a sophomore in high school who is interested in pursuing engineering.  One of my projects is a CNC router.  I am paralleling my design with several online versions.  I am also building a simple h-bridge controller board (thank you mach 2/3 for providing easy signals to work with).  This is my first major project (I did a small mill conversion on a dremel drill press).  Our robotics team has a Tormach at school that uses Mach 3.  Once I get to work on the machine, I can explore the world of CNC even more than just the theory. 
Any general advice on building a CNC router would help. 
Thanks,
Nishant

4

FAQs / Step and Dir signals

« on: May 13, 2010, 07:45:05 PM »

Can someone please tell me the truth table for the step and dir signals.  In the manual, it says that the dir signal is active low, however, how can the computer tell the machine to go cw and ccw while in the low state?  Is it that high is cw and low is ccw, or the other way around? 

Thank you,
Nishant