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Stepper Motor Configuration

Based on the leadscrew and gearing of the stepper motor, the relevant files will need to be updated.

The files to be updated are in this folder: /home/cnc/linuxcnc/configs/REB/REB_Axes.

Data Needed for the Calculation

1. Within the relevant axis file, note the UNITS in the [JOINT_#] section. This is the basis for many calculations. The typical settings are:
   • linear axes (X, Y, Z, U, V, & W) - inch
   • rotary axis (B) - degree
2. Stepper motors used are typically 1.8 deg / step. If different on your configuration, this needs to be identified.
3. The drivers (StepperOnline DM542T) are set to
   • Microsteps = 32
   • Steps / rev = 6,400

4. Conversion of metric to imperial:

5. The leadscrew's relevant information:
   • Pitch = 2 mm
   • Starts = 4

6. The relevant information regarding gearing:
   • Motor gear = 12 teeth
   • Driven gear = 108 teeth

Calculations for Axis File

Note: Do not include the comma (",") when setting the value in the file.

Linear Axis Resolution

For the item noted above with an 8mm/rev leadscrew and a 9:1 gearing ratio (182,880 microsteps/in):

A more typical ratio for a NEMA 17 stepper motor is a 2mm/rev leadscrew and a 1:1 gearing ratio (81,280 microsteps/in):

Spindle Indexing Resolution

For a spindle with a 9:1 gearing ratio,