Zootalaws

The motion control should aim to get all three axes converging at the same point in time. It uses the feed rate to determine the speed of convergence.

If, for example, your Z has to move 50mm, your A 10mm and your C 5mm, Z will move at the maximum feedrate, with A and C calculated to meet it at the appropriate feed rate to achieve this.

If your C has to move 270 degrees, your A 340 degrees and your Z 0.5mm, all axes will start moving at the same time, but your Z will be moving very slowly in relation to your other two axes.

You also need to factor in the type of motion control planning that TinyG implements, compared to other systems like GRBL. The S-curves of increasing/decreasing acceleration that the TinyG implements is very different from other systems, which makes for very complicated 3-axis movements in accelerate, sustain, decelerate motion.

Like a 3D helix created in real-time to ensure a point is reached in concert.

Unless this is resulting in an incorrect cut, I’m not sure why you should care about the individual rate of movement of each axis.

I must say, I’m a bit confused about what exactly is going wrong.

Earthing problem

You’re welcome.

If you connect your vfd pwm inputs to the pwm + – on the TinyG, you can control the speed of your spindle using the TinyG.

Without knowing what vfd you have, impossible to give you more information than that

I use an OrangePi Zero Plus (about $20 with case, another couple of cents or so for a 12v > 5v step-down) running serial port json server with chilipeppr as my wireless interface. On the same Pi I have Laserweb/CNCWeb host and octoprint, but it took a little fettling.

I use TinyG/G2 with laser and CNC router and it is solid.

If I was going to use external drivers, I would use a Due with G2Core and appropriate shield, rather than a TinyG

• This reply was modified 6 years, 3 months ago by Zootalaws.

Firstly, good job at placing your expensive electronic device on an earthed metal conductor. Bonus points for magic smoke!

Second, have you adjusted the drivers power? Have you connected that stepper to a different axis? What happened when you did that?

I just json it from a stock file.