CNC (Computer Numerical Control) handwheels, also known as MPG (Manual Pulse Generator) handwheels or electronic handwheels, are devices used to manually control the movement of CNC machines. These handwheels allow operators to fine-tune the position of the machine's cutting tool or workpiece in a precise manner. They are particularly useful during setup, maintenance, and troubleshooting tasks where precise manual control is needed.

CNC handwheels typically have one or more rotary encoders that generate electrical pulses as the wheel is turned. These pulses are then translated into motion commands by the CNC controller, which moves the machine's axes accordingly. Some handwheels also feature additional buttons or switches for controlling various machine functions.

CNC handwheels can be used with different types of CNC machines, such as mills, lathes, routers, or plasma cutters. They are available in wired or wireless versions and can be integrated into existing CNC control systems.

Key features of CNC handwheels may include:

    + Axis selection: Allows the operator to choose which axis (X, Y, Z, or A) to control with the handwheel.
    + Increment selection: Enables the operator to choose the step size for each pulse generated, such as 0.001 mm, 0.01 mm, or 0.1 mm.
    + Emergency stop button: Provides an immediate stop of the machine in case of an emergency.
    + LCD screen: Some handwheels come with a small display to show relevant information, such as current axis position or selected increment.

Using CNC handwheels can greatly enhance the precision and control during manual operations, making them an important accessory for CNC machine operators.