On Fri, 5 Jul 2019, John Dammeyer wrote:
Date: Fri, 5 Jul 2019 11:21:38 -0700
From: John Dammeyer <jo...@autoartisans.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "'Enhanced Machine Controller (EMC)'" <emc-users@lists.sourceforge.net>
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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Mesa Electronics
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