![]() ![]() ![]() Spoiler, it works really well for my needs, noting I only use the K40 occasionally and for relatively small gifts mainly for friends and family. This instructable will assume you can connect up the board to the machine. ![]() I will also try to link the sites I found useful and link to the places I got firmware from. I will also include any specific files I created / edited with the caveat that they have been created for my specific needs. The attached photo details the connections that need to be made to the K40 Power supply from the CNC shield for controlling the Laser Power through software running on a connected PC / Mac to the Arduino. Z limit switch if you have one should be connected to Spindle enable I have not included the motor connections as these should be obvious. The base or gate of the transistor needs to be connected via a 1 Kohm resistor to Z+ pin on the CNC shield. ![]() I have not included the requirement to power the CNC shield, but Power will need to be connected to the CNC shield, in this case, 12 to 36v DC, make sure the polarity is correct. Note, the CNC shield does not provide 5V, this is supplied to the shield directly from the Arduino, which in turn is supplied by the PC / Mac from the USB cable.įor connection of a potentiometer and voltmeter see. In order to build the firmware, you are going to have to go to to get the firmware first and you will need the Arduino IDE from. There is a Wiki page on how to build the firmware and install it to your machine. You should only need to edit the Config.h file if you have any specific requirements. Note you have to add the GRBL library to the Arduino IDE to get it to work, details on this are at An example of specific requirements could be disabling the need to Home the Z axis for instance if you don't have a variable height table or in my case, as I have 2 optical endstops and a mechanical one, you can invert each endstop individually in the config file. I have also added the GRBL file for my setup, note the X & Y steps and so on should be the same if you haven't changed the gearing and have the same Microstepping as me set on the motors, otherwise you will need to experiment. ![]()
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