Re: [Emc-users] Spindle Control

[Peter C. W. <pc...@me...>]

On Fri, 5 Jul 2019, John Dammeyer wrote:

> Date: Fri, 5 Jul 2019 11:21:38 -0700
> From: John Dammeyer <jo...@au...>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc...@li...>
> To: "'Enhanced Machine Controller (EMC)'" <emc...@li...>
> Subject: [Emc-users] Spindle Control
> 
> 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
>
>

You would need (for a parallel port) to add a stepgen component, set it into 
velocity mode and set the scaling so that a velocity command of 3000 gives you 
25 KHz (setp stepgen.N.position-scale 8.333 ) then net motions absolute speed 
command to the stepgens velocity command

for forward and reverse you net the desired parallel port pins to motions
spindle forward or reverse pins

For a Mesa card you basically do the same thing except you dont need to load a 
stepgen component, instead the firmware you are using must have a free hardware 
stepgen for the rate --> analog converter

>
>
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Peter Wallace
Mesa Electronics

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