Feedrate Test

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Picengravertoo
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Feedrate Test

Postby Picengravertoo » Fri Mar 18, 2016 3:26 pm

We just did a feedrate test engraving a Dithered image with just S0 (white) S255 (Black) commands to pulse the laser on/off. The Feedrate was set at 200IPM in the gcode file and it took 47:29 (2849 sec) in time to engrave. The engraving is 10" X 8.34", but we used Skip White in PicEngrave Pro 5 to cut down on the overall engraving time.

We reversed engineered the gcode and it has a 9417.644408 inch perimeter (travel distance). To confirm the actual feedrate it engraved at, we did a simple calculation.

9417.644408 / 2849 = 3.305596492804493 * 60 = 198.3357895682696 Inches Per Minute.

This test confirms that the S commands for laser control are executed close enough in real time when using the J-Tech PWM grbl. To achieve these kind of accurate feedrates, some settings need to be changed in grbl to increase the overall performance.

$0=30 (step pulse, usec)
$1=255 (step idle delay, msec)
$10=18 (status report mask:00010010)
$11=0.005 (junction deviation, mm)
$14=1 (auto start, bool)
$110=5250.000 (x max rate, mm/min)
$111=5250.000 (y max rate, mm/min)
$120=12000.000 (x accel, mm/sec^2)
$121=12000.000 (y accel, mm/sec^2)

Here is the laser's travel path. There was a total of 587639 lines of gcode that we ran with our PicSender streamer.

Capture.JPG
Capture.JPG (110.42 KiB) Viewed 2765 times


Here is the TTL engraving on Birch Ply.

Fishy.jpg
Fishy.jpg (381.51 KiB) Viewed 2765 times

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Picengraver
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Re: Feedrate Test

Postby Picengraver » Fri Mar 18, 2016 7:04 pm

Slick (the engraving - math is ok, too :lol: )
John

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Re: Feedrate Test

Postby Honk » Fri Apr 08, 2016 3:09 pm

That is a great Bass picture but 200 IPM is almost the speed of sound. It would be in Montana
Jerry

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Re: Feedrate Test

Postby Picengravertoo » Fri Apr 08, 2016 6:51 pm

Hi Jerry,

You will be lazing at 200IPM in Montana before you know it. ;)

Jeff


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