[Emc-users] Spindle Control

[John D. <jo...@au...>]

I have a small module  (DC_06) from Homann Designs for generating the 0V to 10V voltage for spindle VFD from step pulses that range from 0Hz to 25kHz for 0% to 100% respectively .  

Under MACH3 it's easy to use because one just clicks on the Ports and Pins menu entry and up comes the dialog with this section.
http://www.autoartisans.com/mill/SpindleStep_Dir.jpg

With LinuxCNC it appears that there is only support (documented) for PWM to spindle speed.

What do I set up in the HAL and INI files so that S3000 creates 25kHz stepping pulses (100%) for3000 RPM and one of the outputs is set high/low for M3/M4?

Is the PWM module even required?  

Thanks
John