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\layout Chapter

Spindle Control
\layout Section

0-10v Spindle Speed
\layout Standard

If your spindle is controlled by a VFD with a 0 to 10 volt signal and your
 using a DAC card like the m5i20 to output the control signal.
 
\layout Standard

First you need to figure the scale of spindle speed to control signal.
 For this example the spindle top speed of 5000 RPM is equal to 10 volts.
 
\begin_inset Formula $10/5000=0.002$
\end_inset 

 so our scale factor is 0.002
\layout Standard

We have to add a scale componet to the hal file to scale the motion.spindle-speed
-out to the 0 to 10 needed by the VFD if your DAC card does not do scaling.
\layout Standard

loadrt scale count=1
\layout Standard

addf scale.0 servo-thread
\layout Standard

setp scale.0.gain 0.002
\layout Standard

net spindle-speed-scale motion.spindle-speed-out => scale.0.in
\layout Standard

net spindle-speed-DAC scale.0.out => <your DAC pin name>
\layout Section

PWM Spindle Speed
\layout Standard

If your spindle can be controlled by a PWM signal, use the pwmgen component
 to create the signal:
\layout Standard

loadrt pwmgen output_type=0 
\layout Standard

addf pwmgen.update servo-thread
\layout Standard

addf pwmgen.make-pulses base-thread
\layout Standard

net spindle-speed-cmd motion.spindle-speed-out => pwmgen.0.value
\layout Standard

net spindle-on motion.spindle-on => pwmgen.0.enable
\layout Standard

net spindle-pwm pwmgen.0.pwm => parport.0.pin-09-out
\layout Standard

setp pwmgen.0.scale 1800 # Change to your spindle's top speed in RPM 
\layout Standard

This assumes that the spindle controller's response to PWM is simple: 0%
 PWM gives 0RPM, 10% PWM gives 180 RPM, etc.
 If there is a minimum PWM required to get the spindle to turn, follow the
 example in the nist-lathe sample configuration to use a scale component.
 
\layout Section

Spindle Feedback
\layout Standard

Add this section
\layout Section

Spindle Enable
\layout Standard

If you need a spindle enable signal link your output pin to motion.spindle-on.
 To link these pins to a parallel port pin put something like the following
 in your .hal file making sure you pick the pin that is connected to your
 control device.
\layout Standard

net spindle-enable motion.spindle-on => parport.0.pin-14-out
\layout Section

Spindle Direction
\layout Standard

If you have direction control of your spindle the hal pins motion.spindle-forward
 and motion.spindle-reverse are controlled by M3 and M4.
 S must be set to a positive non zero value for M3/4 to turn on spindle
 motion.
 
\layout Standard

To link these pins to a parallel port pin put something like the following
 in your .hal file making sure you pick the pin that is connected to your
 control device.
\layout Standard

net spindle-fwd motion.spindle-forward -> parport.0.pin-16-out
\layout Standard

net spindle-rev motion.spindle-reverse => parport.0.pin-17-out
\the_end