# Max travel speed?

(Reid Forrest) #1

Even though I’m a couple of days away from receiving my SO3 XXL, I’m already thinking of upgrades. Would like to add a laser, but I need to know the maximum travel speed of the X and Y axes to determine which laser I’ll put on the machine based on material and laser power. I couldn’t find this info anywhere on the website or through searching here.

That’s a good question.

The fastest material cutting speed listed at: http://docs.carbide3d.com/support/#tooling-support is 100" / min.

The original homing seek rate setting was 1000" / min., and then that was suggested to be 1500" / min for XLs and XXLS on the Grbl defaults page, and the default is now 2000" / min. I believe.

The thing is, the machine can only accelerate / decelerate so quickly.

``````\$110=5000.000 (x max rate, mm/min)
\$111=5000.000 (y max rate, mm/min)
\$112=5000.000 (z max rate, mm/min)
\$120=400.000 (x accel, mm/sec^2)
\$121=400.000 (y accel, mm/sec^2)
\$122=400.000 (z accel, mm/sec^2)
``````

so one ought to be able to calculate the max speed the machine can get up to — might be that one could tweak those settings for performance — see “Shapeoko Racing League”:

(Stephen Gullage) #3

Why would you need to know max feedrate to determine which laser to use? It’s not like your going to burn the image by turning the laser on continuously and then moving the head faster or slower to control the depth of cut. The laser would be pulsed to control that. The higher the power laser, the less time the head will have to linger over any particular spot to get the required depth.

(Reid Forrest) #4

That’s a good point, and I’m just learning. I was looking at recommended feed rates for various materials and laser powers. So when attaching a laser it’s possible to control the pulse rate depending on material or depth of cut? What software would I use for that? Sorry for the noob questions.

(Stephen Gullage) #5

I can’t answer that well, as my experience with a laser engraver is a 1500mw unit I picked up just to play around with. Came with some limited software that does what I want it to do. However, two good sources of info are the Jtech website with a specific page for the Shapeoko3, https://jtechphotonics.com/?page_id=3145 and the Shapeoko wiki has a ton of info https://www.shapeoko.com/wiki/index.php/Laser_Cutter

(system) #6

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