Sending a bitmap/raster image in G-Code syntax (which is designed for vector instructions) is a terrible waste of bytes. Second reasone is the speed of communication in relation to the G-Code data stream.
grbl/grbl#41 (this is not the bottleneck in your case) With your $100=126 this is equivalent to 30000/126 = 238mm/s = 14'285mm/min so this is not the limit. However, as already mentioned, there are speed limits due to some reasons.įirst reason is arduino's working frequency and grbl code speed that fix a limit of about 30kHz as step frequency.
#$400 40w laser cutter inkscape laserdrw software
Faster and powerfull hardware usually have a dedicated software optimized for controller board. In developing LaserGRBL I always had in mind hobby use of hardware with limited power and speed, specially DIY engraver up to 10W laser diode. Hi and thanks for your precious comments and computation I Greyscale engrave at 10 pixels per mm, so that's 100mm per second or 6000mm per minute. So there we have about 1000 lines per second. I am experimenting with gcode where 1 pixel looks like 'X12.4S465' which is only 11 characters per line. With your resolution set to 20 pixels per millimeter, your have 500 / 20 = 25mm per second, or 1500mm per minute. With each line being 1 pixel, you have 500 pixels per second. Add 2 for a carriage return and you have 23. Your screenshot shows lines line 'G1 X0 Y0.05 F40000 S0' which is 21 characters. So from the you need to look at the gcode file and estimate how many characters per line there are. Because of the ping pong mature of GRBL, lets just say 10000.
#$400 40w laser cutter inkscape laserdrw serial
So on an Arduino Uno running a 328, you have a maximum serial bandwidth of 115200 (By default, can be recompiled with a higher settings) that give you 12800 characters per second. I have also found for what ever reason, GRBL-LPC receives data much faster than the 115200 baud selected. If speed is keep, GRBL-LPC is the way to go. Even Marlin on a Mega2560 and it's base64 method seems to run out of processing power at around feed rates of 7000. On the Arduino Mega, with it's larger buffers seems to be a little better, but GRBL-LPC just kicks everything else out of the park. GRBL on the Arduino with a 328 just runs out of steam with.
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