Galvo

[SerkanGuryalcin]

Hello dear I'd like to do galvolaser and ı need to read gcode. My project need 2 axis x and y so how can ı use grbl

[alflexRH]

the simple answer is: you cant. GRBL can only do steppers, not galvos.

[SerkanGuryalcin]

I see. Do you know how can ı read gcode for galvo motors ?

[langwadt]

if there is room for the code you could just modify GRBL, leave it mostly as is but instead of step/direction output, just have the galvos follow the resulting position

[X3msnake]

what are galvos btw, some kind of servo motor?

No dia domingo, 20 de janeiro de 2019, langwadt notifications@github.com escreveu:

if there is room for the code you could just modify GRBL, leave it mostly as is but instead of step/direction output, just have the galvos follow the resulting position

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-- Com os melhores cumprimentos, Vinicius Silva

[alflexRH]

Galvos usually take a 0-10V or -10 to +10v input for fully left to right. cant drive little to no load, but are VERY fast. full sweep in 0.05 - 0.1ms !

[X3msnake]

so servo then

No dia segunda-feira, 21 de janeiro de 2019, alflexRH < notifications@github.com> escreveu:

Galvos usually take a 0-10V or -10 to +10v input for fully left to right. cant drive little to no load, but are VERY fast. full sweep in 0.05 - 0.1ms !

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-- Com os melhores cumprimentos, Vinicius Silva

[alflexRH]

yes, but usually when people talk about servos they mean 3-phase BLDC-type servos, those that can do multiple revolutions, and their controllers take step/direction (or other) pulses.

or the 1-2ms pulse RC hobby servos).

[X3msnake]

so galvos are more like fixed motion rc servos but driven by voltage...

No dia segunda-feira, 21 de janeiro de 2019, alflexRH < notifications@github.com> escreveu:

yes, but usually when people talk about servos they mean 3-phase BLDC-type servos, those that can do multiple revolutions, and their controllers take step/direction (or other) pulses.

or the 1-2ms pulse RC hobby servos).

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-- Com os melhores cumprimentos, Vinicius Silva

[SerkanGuryalcin]

So can I read g code with galvos ??

[X3msnake]

I think you would need to change the way GRBL sends things to your galvo drivers.

We are talking of going from a looping model where each full tur corresponds to a number of steps that then correspond to a given axel motion to something that is more like controlling a PWM laser from 0-255 where 0 is the minimum position of your set table boundary and 255 is the max.

I don't know enough programming to know what you would have to change or where but i think it might not be as easy as swapping a few lines of code, I may be wrong tho.

SerkanGuryalcin notifications@github.com escreveu no dia segunda, 21/01/2019 à(s) 17:48:

So can I read g code with galvos ??

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[X3msnake]

some google Fu returned this:

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http://www.buildlog.net/blog/2018/02/laser-galvo-control-experiments/

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https://photonlexicon.com/forums/archive/index.php/t-27033.html

"According to the specification, all X / Y / Synch control signals should be synchronized with the 2MHz clock signal. In Arduino UNO it is very difficult. "

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https://plus.google.com/communities/109609533907401814291/stream/401252fa-796c-4680-afa6-961794b39ac8

https://github.com/Blacksheep70/Marlin-OpenSLA

[SerkanGuryalcin]

Thanks a lot I will try all methods

[X3msnake]

@SerkanGuryalcin Keep us posted here on your results i'm curious about this too :)

[TehseenHasan]

What if I make Stepper Motors based Galvo then control it with GRBL.? then is it possible and effective.? For example like this guy done: https://www.youtube.com/watch?v=46jKSFHXgiI