laser power adjustment to the speed

Discussion about the arduino based g-code interpreter, grbl
felixa4
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laser power adjustment to the speed

Post by felixa4 » Tue Mar 29, 2016 7:52 pm

hello dear international friends, I am italian and new in the forum and I ask you to help with a problem of all those who use the CNC laser: during acceleration and deceleration the laser burns too much or pit material; I'm not good in programming and I ask you to change grbl code (dedicated to the laser) to proportion the laser power to speed during acceleration and deceleration, for example starting with P = 1 / k (programmable via $) to speed 0, and P = 100% at full speed. on the contrary for the deceleration ramp. this is my idea.
many thanks for your interest, byyyyyyyyyyyyeeeeeeeeee ;) ;) ;)

AnonymousPerson
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Re: laser power adjustment to the speed

Post by AnonymousPerson » Tue Mar 29, 2016 9:23 pm

Ahhhh, this is probably not the "correct" place for the suggestion.

Instead, it would be better here:

https://github.com/grbl/grbl/issues

Are you ok to add it there? :smile:
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cvoinescu
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Re: laser power adjustment to the speed

Post by cvoinescu » Tue Mar 29, 2016 9:27 pm

That's probably not the "correct" place either, because stock GRBL does not support lasers anyway. There are a few forks that do; maybe suggest it to them.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

AnonymousPerson
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Re: laser power adjustment to the speed

Post by AnonymousPerson » Tue Mar 29, 2016 10:11 pm

cvoinescu wrote:That's probably not the "correct" place either, because stock GRBL does not support lasers anyway. There are a few forks that do; maybe suggest it to them.
Good point. Doing some searching turns up this laser focused :D version of GRBL:

https://github.com/alpharesearch/grbl/tree/laser

It doesn't seem to be receiving updates though. The alpharesearch people themselves might be useful to talk to. :)
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AnonymousPerson
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Re: laser power adjustment to the speed

Post by AnonymousPerson » Tue Mar 29, 2016 10:19 pm

Another fork with laser support. Also not receiving recent updates:

https://github.com/alsliahona/grbl/tree/LaserMode
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picengravertoo
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Re: laser power adjustment to the speed

Post by picengravertoo » Wed Mar 30, 2016 1:19 pm

Shapeoko 2 Laser Diode Engraver-Analog/TTL/PWM
PicEngrave Pro 6 Image to Gcode for grbl/Mach3 controllers-Spindle/Laser
PicLaser: Image to Gcode With Editor
PicSender: Streams grbl Raster/Vector Gcodes
https://www.picengrave.com

FargoPhil
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Re: laser power adjustment to the speed

Post by FargoPhil » Wed Mar 30, 2016 3:18 pm

It sounds like official laser support is pending. This is discussed in more detail over in the Acceleration thread.

No idea how close it is to becoming real.

chamnit
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Re: laser power adjustment to the speed

Post by chamnit » Wed Mar 30, 2016 3:43 pm

Very close. :) I'm generally done, but need to test and optimize the code. However, I keep getting pulled into things that Inventables needs me to do before i can do it.

halfnormal
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Re: laser power adjustment to the speed

Post by halfnormal » Wed Mar 30, 2016 4:17 pm

Jtech's version of GRBL is made with laser in mind. Info here http://jtechphotonics.com/?page_id=1100
Download here http://jtechphotonics.com/Downloads/GRB ... J_TECH.zip
He is actually updating it and a newer version will be out shortly.

Also if you use PicEngrave software, it is optimized for laser. All their software is found here http://picengrave.com/

Welcome to the world of lasers and GRBL! I am having fun trying to optimize it for a 40 watt CO2 laser system.

AnonymousPerson
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Re: laser power adjustment to the speed

Post by AnonymousPerson » Wed Mar 30, 2016 5:18 pm

chamnit wrote:Very close. :) I'm generally done, but need to test and optimize the code. However, I keep getting pulled into things that Inventables needs me to do before i can do it.
Ahhh, is there a public branch with that in it?

The "test" part of "test and optimize" can probably be helped along just by pointing people at it... ;)
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