new HC115 MPG CNC Handwheel Handle Manual Pulse Generator Fits for FANUC For TOSOKU.

CNC · MPG Handwheels · HC115 · Fanuc / Tosoku Compatible · Manual Pulse Generator

What Is the HC115 MPG CNC Handwheel?

The HC115 MPG (Manual Pulse Generator) is the handwheel that CNC machinists use to manually jog each axis -- the knob you turn to position the tool precisely before starting a program or to touch off a workpiece. It generates quadrature-encoded pulses as you rotate the dial: each click (detent) produces one pulse, and a typical HC115 outputs 100 pulses per revolution (PPR) with A/B 2-phase output. It is designed as a direct replacement for Fanuc and Tosoku MPG units found on machining centers, lathes, and EDM machines from the 1990s through today.

In short: The handwheel that replaces a worn or dead MPG on your CNC control panel -- if the dial on your VMC feels gritty, skips counts, or the rubber grip has disintegrated, this is the drop-in replacement.

Before You Swap It -- Wiring and Compatibility Check

1. Count the wires on your old MPG. Most HC115 units have a 4-wire or 5-wire connection: +5V (red), 0V/GND (black), A-phase output (white or green), B-phase output (yellow or blue), and optionally a shield/drain wire. Match color-for-color, but verify with a multimeter -- some machine builders used non-standard colors.

2. Confirm supply voltage. Standard MPG units run on 5V DC or 12V DC. The HC115 is typically 5V. If your control supplies 12V to the MPG, you will need a voltage regulator or a 12V-rated handwheel. Applying 12V to a 5V MPG may damage the internal opto-coupler.

3. Check the pulse-per-revolution setting in parameters. Fanuc controls expect either 25 PPR or 100 PPR from the MPG (set in parameter). If your new handwheel is 100 PPR and the control is set for 25 PPR, each click will move the axis 4x further than expected -- dangerous during setup. Verify the parameter matches the new MPG specification.

Key Specifications

PPR (pulses per revolution), supply voltage, output type (voltage differential vs open-collector), and connector pinout -- verify from MPG label or confirm with your machine manual.

Frequently Asked Questions

How do I verify an MPG is working before installation?

Power the MPG with the correct voltage (typically 5V DC). Connect an oscilloscope or a multimeter with frequency-measurement capability to the A-phase output relative to ground. Turn the dial slowly -- you should see a square wave pulsing. The frequency should increase as you turn faster. The B-phase output should produce the same signal shifted by 90 degrees. If either phase is stuck high or low regardless of rotation, the MPG is defective.

My axis only moves in one direction -- is the MPG bad?

Not necessarily. If the axis moves in one direction but not the other, the control is likely receiving only one of the two quadrature phases. The CNC determines direction by seeing which phase leads the other -- with only one phase, it cannot tell which way you are turning. Check the B-phase wire for an open circuit, broken pin in the connector, or cold solder joint. Swap the A and B wires temporarily -- if the axis now moves in the OTHER direction only, the B-phase wire or output is faulty.

Will this handwheel fit my non-Fanuc machine?

Electrically, an MPG is fairly universal -- A/B quadrature at 5V or 12V is the standard across Fanuc, Siemens, Mitsubishi, Heidenhain, and Fagor controls. The mechanical differences are the mounting hole diameter, the connector type, and the supply voltage. Measure the mounting hole in your pendant or control panel before ordering. Some machines use a 16mm mounting hole, others use 22mm or custom sizes. Adapter bushings are available if the hole is slightly oversize.

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