My understanding is limited and I am guessing that frequency output to pulse input do not coincide. The spindle speed is not correlating to the rpm selected. The only way I was able to get the motor to work is with the Pulse input. My understanding is that the N3 VFD spindle speed can be controlled via external source with either and anlog 0-10v input or Pulse Input. I am currently running PathPilot 2.7 with ECM v1.4 board and Teco N3 vfd. Extract 'Legacy' Arduino 1.8.x and rename the extracted directory to denote that it is modified for this purpose, since the Teensy 'cores' files will be modified.Hope someone can help me out understand how PathPilot ver 2.7 controls spindle speed with Tormach's ECM v1.4 board.

This firmware was developed using the Linux version of the Arduino environment, but it should be possible to use any of the supported platforms with some changes to the process. A customized version of the Teensy 'cores' are required, as it contains the customized USB HID implementation necessary for the controls to work. The firmware builds using Teensyduino, the Arduino environment wrapper for the Teensy series of microcontroller boards.

To date only Teensy LC and Teensy 3.5 have been tested.

The changes to the Teensy cores should work on any Teensy 3 or Teensy LC, but will not work on Teensy 4 unless the changes are ported. Note that other Teensy 3 devices will work if you do some work to remap the pins appropriately.

handheld pendant wheel support for step/continuous jogging of X,Y,Z,A axes with various step distances.

RGB LED status indicator for error conditions, ready, etc.

physical rotary encoder for spindle RPM override 0-200%.

physical rotary encoder for feed rate override 0-200%.

physical rotary encoder for max velocity control 0-100%, good when proving new G-Code or for new users.

physical CYCLE START, FEED HOLD, STOP buttons (potentially others).

Physical pendant based on Teensy LC (or Teensy 3) hardware This means it works with unmodified versions of PathPilot 2.9.2 onward - a vast improvement, allowing us to keep the control software up-to-date without a tedious manual patching process each time. Unlike the legacy version (circa 2017, contained in branch pathpilot1-custom-integration), which required extensive customization to PathPilot 1.x to function, this version emulates the official Tormach controls that have recently become available. R&D, Software and Electronics by Steve Richardson ( is the 2023 version of the custom pendant built for the MakeIt Labs Tormach CNC mill.

Emulated Tormach PathPilot Operator Console Controls

What cnc controler type is pathpilot