All controllers actually support slaving as long as there are enough step and direction connections on the controller to allow for either the A, B, or C axis to be used. The feature is set up in Mach3 or Mach4. Under the config menu, you can select the Slave Axis selection and specify the A, B, or C axis as the slave. The A axis is motor connection 4, B is 5 and C is 6. Make sure to set the steps per unit the same as the main axis since Mach will not do this automatically.
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does the pokeys57cnc controller support slaving an axis?