It is on the same pyvcp panel that was installed for showing spindle speed.Īssuming you’ve already installed Probe Screen above, these are the steps to set up a Z touch-off button.Īdd the following code to “pyvcp-panel.xml” to add a button to the GUI. When the cutting tool contacts the touch plate, the input pin will be grounded and read as active.įor finding Z zero, which must be done every time a tool is changed during a program, I added a button to the GUI.
#Cnc touch plate wired to audio jack software#
Inverting the signal in software will make it inactive at 24 vdc. Since the touch plate will supply ground when active, a pull-up resistor can be used to pull the input up to 24 vdc when the probe is not active. With the Mesa 7i76e, the inputs expect to see 24 vdc to read active. Then the routine can automatically calculate the zero point based on the programmed thickness of the touch-off plate. When the controller senses ground, it stops the motion and takes note of that Z coordinate. There is a wire connected to the plate that runs back to an input pin on the control board. When the tool makes contact with the touch-off plate, the plate becomes grounded. The probing routine drives the tool slowly down towards the plate. Many touch off plates work by applying a ground wire to the spindle or cutting tool and sensing the tool making contact with a plate. G54) so the machine knows where the part is mounted on the bed and can command all the moves in the G code program relative to the zero point of the part, as was defined in the CAM programming.
#Cnc touch plate wired to audio jack how to#
This article documents how to add a touch plate and probing function for the Torsion CNC Router when using a Mesa 7i76e FPGA board and LinuxCNC 2.8Ī probe routine can be used to detect the X, Y, and Z zero coordinates after you mount a part or piece of raw stock material on the CNC router bed.
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