Preferences Screen

Purpose: The factors on these screens control how speeds and distances are determined.

• The values shown in a  tan box  show values on the Nextion. Touching one of the text boxes allows you to edit that value using the Number Pad screen.


• The values shown in a  gray box  show the ones stored on the Teensy controller. These are read only and should match the settings on the Nextion.

Microsteps	This must use valid values for the stepper driver, and is usually 1, 2, 4, 16, 32, 64, or 128. These settings must match the jumper settings on the PCB. 32 is the designed value for the MDF Rose Engine Lathe 2.0 (as outlined in Instructions for Building the Stepper Controls).
Steps/360	This must use valid values for the stepper motor. The typical step angle is 1.8 deg, so this would be \[ \frac{360 \, \mathrm{deg}}{1.8 \, \mathrm{deg}} = 200 \] 200 is the designed value for the MDF Rose Engine Lathe 2.0 (as outlined in Instructions for Building the Stepper Controls).
Gear Ratio	This is the ratio of the gear on the stepper motor to the gear driving the spindle. This value drives the calculation of RPM. 9 is the designed value for the MDF Rose Engine Lathe 2.0 (as outlined in Instructions for Building the Stepper Controls).
Polarity	The Polarity High and Low radio buttons for both Spindle and Z Axis are set as: High High setting is for use for some external stepper drivers Low Low is the default, which is the correct setting when using the StepperOnline DM542T and the Pololu DRV8825 Stepper Drivers.

★ Strongly recommend you take care when changing these.