Hi Everyone
I am having a hard time finding a CNC control board that will work with 3 amp stepper motors, and Grbl (non Mach)
Either a separate stand alone board or one with changeable stepper motor drivers
Any help greatly appreciated.Thanks
Oops Trying to put this in CNC , think it might have ended up else where, first post
That is a good question that I cannot answer. We have no information on the motor. Let us know what are you using for a power supply? What are the stand alone boards and do you have a data sheet on them. You might also include a schematic, not a frizzy drawing.
Thanks for the help, will get back to you
Normally for that sort of current level you need discrete-MOSFET based stepper drivers like Gecko
drives or similar (there are some cheaper brands than the major industrial stepper drivers).
Single chip drivers are limited to about 2A maximum in practice, as single chips use DMOS
MOSFETs (down to about 0.2--0.3 ohms minimum), not VMOS MOSFETs (minimum 0.001 ohms or lower!)
VMOS requires the back of the chip to be the drain contact, so you can only have one MOSFET
per die.
Hi Brattain
Thanks for that info, do you have any recommendations for a breakout board to go with Gecko drivers,
also would you happen to know, can i use DRV 8711 high amp rating plugin drivers in a
controller board that will run Open source, programs like GRBL,
Thanks Stephen
Ah yes the DRV8711 is a great chip - I've made a board in the past using it, and they do
sell cheapish basic driver boards using it. No idea if there's a breakout to host multiple
DRV8711's though. It requires SPI control so you'd need to run SPI, 4 selects, power,
step and directions....
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