Zootalaws

The better way is to use servo motors rather than steppers

Or…. Bridging the price gap, closed-loop steppers

You would need external drivers and to use in step/direction mode

You would be better off to use a 12V supply for the laser. It’s probably cheaper than a DC-DC transformer.

The PWM output will be fine to use to control your laser, but you will need to have a different set of operating PWM parameters than you would for a spindle. Your LED laser (I presume) will be expecting a different range than your spindle.

This may help: https://jtechphotonics.com/?page_id=6798

• This reply was modified 2 years, 11 months ago by Zootalaws.

Need to make the CNC move as fast as in the below video link. Can someone help me do it?

I don’t understand the question.

What’s stopping you moving as fast as that machine?

What have you tried and what hasn’t worked?

I want to run like Hussein Bolt. Can someone help me do it?

If you don’t describe your problem, what you’ve done so far, and why yo’ve been unsuccessful, how do you expect someone that knows nothing about your machine to tell you what to do?

$XVM=5000 tells the machine what the maximum velocity should be when executing G0 moves. Why isn’t your machine traversing at that rate? What is happening? Are the TinyG stepper drivers big enough to drive the machine at that rate?

You’re asking a tiny little solid state stepper driver to drive what looks like at least 10kg of hardware at 5 metres a second. 18 km/h. Faster than I can walk and almost the maximum I can run.

I’ve got some pretty hefty machines and nothing I have runs at that rate.

I have a machine with hybrid NEMA32 stepper/servos running at 50V that can just reach that rate, using an advanced DSP controller that is about 20-50x faster than a TinyG

I’m not sure you have defined your needs properly if the TinyG was the answer to your requirement to go 5M/sec.

You certainly haven’t described your issue enough.

All axes can be homed.

The docs use ‘x’ as the example, but xyz and abc are supported.

https://github.com/synthetos/TinyG/wiki/Homing-and-Limits-Description-and-Operation#g282—homing-sequence-homing-cycle

edit: can’t find the G2 support forum…

Wossappened?

• This reply was modified 5 years, 2 months ago by Zootalaws.

Why are you homing on max, rather than min?

Max is for limit, not homing

• This reply was modified 5 years, 8 months ago by Zootalaws.
• This reply was modified 5 years, 8 months ago by Zootalaws.

You can go further and make it wireless using ESP32 or Bluetooth.

Works great.

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.