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Messages - skmetal7

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Feature Requests / New Spindle Output Option
« on: June 06, 2010, 06:10:12 PM »
Ok so many of us have been looking into brushless motors from the RC industry to drive our high speed spindles. I was thinking, if you guys could implement the control scheme to drive a brushless motor Electronic Speed Control or ESC. What this ESC needs to run is a modified version of a PWM square wave. Its a 1-2ms pulse every 20ms at 5v. So 1-2ms pulse @ 50Hz (0 rpm @ 1ms, full rpm @ 2ms).  

-____-____-____  <---- 1ms   --___--___--___  <---- 2ms

Also have an arming feature built in since some have a safety feature where they need to have the "throttle" at a certain pulse rate ( 1.5ms or whatever) for a second or so when you first turn it on ( just have a box to enter a wait period, and ms pulse length).  So if mach3 reads an m3 command, it will activate a relay, turning on the spindle ESC. I guess this could be tied into the Dwell feature of mach3... not sure...

Right now I getting help programming an arduino to take mach3's normal square wave and convert it to this control scheme.  But if you can do this, this extra electronics won't be needed.

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