clock speed etc

hi all,ive built a cnc mill/engraver with a uno and nema 23 steppers,if i run the drivers on 1/32 microstepps the motors run quiet and smooth but the uno falls over with the amount of pulses it tries to output,is there a board faster than a uno that can do this?,that is still gbrl compatable?,cheers m3vuv paul.

m3vuv:
is there a board faster than a uno that can do this?,that is still gbrl compatable?

Don't you think you could at least look at the GRBL website before you ask here?

dont you think ive already done that,smartarse!!

Steady on, there's absolutely no need for name calling.

m3vuv:
dont you think ive already done that,smartarse!!

No I don't, since the FAQ section of the website clearly links to ports of GRBL to other microcontrollers. There's a version for the STM32F103 which is a fair bit more powerful than the ATMega328, as well as a couple of other micros that I'm not familiar with.

m3vuv:
is there a board faster than a uno that can do this?,that is still gbrl compatable?,cheers m3vuv paul.

Yes, details are on the GRBL Website.

ive looked on the gbrl website but cant find anything,that seems a dropin replacement for my cnc shield,any ideas?

m3vuv:
ive looked on the gbrl website but cant find anything,that seems a dropin replacement for my cnc shield,any ideas?

No until you tell us exactly which CNC shield you have.

My guess is the problem isn't software, but EMI or noise on the power rails from the motors.

the shield is a v3 protoneer,thought i mentioned that before?.

m3vuv:
the shield is a v3 protoneer,thought i mentioned that before?.

Not in this thread. I don't know of anything that's going to help you here- you can certainly use an STM32 to run GRBL but I haven't seen an STM32 board that matches the Uno footprint.
Honestly though I think DrAzzy is on the money here. Can you give us some more details about the problems you're having? Exactly what happens when the Uno 'falls over'?

when it goes pear shaped, both steppers run for say 6 seconds then come to a halt for about 4 seconds then run as normal againe,it continues like this,thats using 1/32 microstepping,it runs fine using half steps but is so noisy,its like the buffers empty then have to refill.,cheers m3vuv.

m3vuv:
when it goes pear shaped, both steppers run for say 6 seconds then come to a halt for about 4 seconds then run as normal againe,it continues like this,thats using 1/32 microstepping,it runs fine using half steps but is so noisy,its like the buffers empty then have to refill.,cheers m3vuv.

During that time, do you see the LED on the Uno board (which may be a big hard to see with the shield attached) do a triple-blink pattern? If you see that tripleblink, that proves that the board is resetting (probably repeatedly) at that point, which would be consistent with my theory aboveā€¦