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Author Topic: Galil + MPG  (Read 5715 times)

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Galil + MPG
« on: March 06, 2007, 09:30:48 AM »
What choices are there for a handwheel on a Galil system?

Extra axis on the Galil, ModIO or basic input?

Re: Galil + MPG
« Reply #1 on: January 06, 2008, 10:56:21 AM »

Will the ModIO or Mod bus work in conjunction with the Galil?


Offline poppabear

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Re: Galil + MPG
« Reply #2 on: January 06, 2008, 12:13:18 PM »

    Aurturos Modbus Cards will pull in MPG's he even has a 6 axis MPG with selector, and yes Modbus will work with galil, Modbus is just another Com channel.
Commercial Mach3 & Mach 4, Design/Build/Retrofit CNC and Industrial machines.
Re: Galil + MPG
« Reply #3 on: July 22, 2009, 01:49:47 PM »
Hello there,

Will the combination of Mach3 + galil motion controller also work with stepper motor and with a linear encoder for control?
In the galilplugin.pdf it mentions MPG [I'm guessing rotary] but I would like to use a linear one.


Offline smurph

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Re: Galil + MPG
« Reply #4 on: July 23, 2009, 08:40:46 PM »
The plugin will work with steppers.  However, you will not be able to use an encoder for closed loop operation.  If you want to use an encoder for moving and axis, then you will have to use a spare Galil axis main encoder, as the secondary Galil encoders are not available with axes configured as stepper axes.  But it makes no difference what type of encoder (linear or rotary) is used as long as it outputs quadrature.  Just that most people use a rotary encoder (hand wheel).

Just to be clear, MPG stands for Manual Pulse Generator.  It's primarily used for manual control of an axis.  And stepper motors do not use an encoder to operate like servos do.  With steppers, you run "encoderless" (open loop) and there is no servo PID loop where encoders provide feeedback.  Mach simply says step this many steps and assumes that the motors arrive at their final destination.

Read the Galil manual for you controller to find all of the details about running stepper motors on the axes.  It's very important that your stepper motors are correctly sized so that they do not "loose" steps.