4-axis Arduino based CNC hot wire foam cutter

Projects General Guidance
1

Yesterday I tried to calibrate with the M92 command.

// NEMA 17 with standard pitch M8 threaded rod:
(400 * 16) / 1.25 = 5120

because my steppers are 0,9 degrees/ step = 400 per turn

So i sent these two commands to my board:

M92 X5120 Y5120 Z5120 E5120
M500

And nothing happened?!

I have this hardware

1 x RAMPS 1.4
1 x MEGA 2560 R3
4 x A4988 driver
1 x USB kabel
4 x NEMA 17 (0,9 degrees/ step = 400 per turn)

I have the A4988 driver on my Ramps and with all three jumpers set. So in my case it is set to 1/16 steps.

It's all running nicely - but uncalibrated!

Is there a simple way I can send this M92 gcode to be saved to my eeprom?

I am an RC plane hobbyist with a preference for big gliders, and I want to build a 4-axis CNC hot wire foam cutter to cut my wings.

2

You have not said what software is running on the Arduino to "receive" and interpret the M92 GCode command.

...R

3

Software:

  • Arduino 1.6.3,

  • 6 Axis CNC Demo Rumba:

  • GcodeSender

Get it here: GitHub - MarginallyClever/GcodeSender: Sends file commands to a serial connected device

The above code (6 Axis CNC Demo Rumba) actually makes a good job, but seemingly it is missing the possibity to choose TURNS_PER_UNIT or similar constants.

I don't want to use Mach3 or Repetier or whatever, because they don't support 4-axis the way I need it.

Well, not as far as I have understood, but I am a beginner in this world.

That's why I came here :slight_smile:

4

In the GcodeCNCDemo project there is a 2axis demo. that sketch uses STEPS_PER_TURN to calculate THREAD_PER_STEP, and then perform IK() to convert from your distance to machine steps.

If you could please add the IK to the 6 axis code and submit a pull request, I'll see that it gets included in the project and your name will be in the credits.

Thanks!

5

aggrav8d:
If you could please add the IK to the 6 axis code and submit a pull request, I'll see that it gets included in the project and your name will be in the credits.

I don't understand exactly, what you ask me to do?

I'm afraid this is beyond my skills :frowning: