Author Topic: core-xy  (Read 197 times)

ggallant571

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core-xy
« on: July 31, 2017, 07:49:20 AM »
Based on the posts by pawpawpaw69 and others I have started a core-xy build. Have frame and first pass belt done. Has anyone determined the necessary belt tension?
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ggallant571

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Re: core-xy
« Reply #1 on: October 25, 2017, 11:59:03 AM »
Machine is operational with a few oddities. Number 1 is speed. I etched a drawing and cut a frame around it. Dimensions of the cut are good. Speed was much slower than expected. The frame was 260 mm at a cutting speed of 600 mm/min. I think it should take 26 seconds. Instead it takes 37 seconds. This is approximately square root of 2 times longer. Is this because a horizontal or vertical line is a 45 to the motor? Why doesn't the firmware compensate?
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ThothLoki

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Re: core-xy
« Reply #2 on: October 25, 2017, 02:00:41 PM »
Ggallant. I cannot speak to any of your questions because I am just starting my corexy setup. I am converting my old broken A5 to a corexy system. I will try to catch up. I am very interested in how it turns out and what answers you find.

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« Last Edit: October 25, 2017, 02:01:31 PM by ThothLoki »
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Zax

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Re: core-xy
« Reply #3 on: October 25, 2017, 02:05:06 PM »
The only reference I have is the EleksDraw and it is slower than the calculations compared to the Cartesian laser but I just figured it was their Mana firmware (Grbl 0.9 and their settings). It does seem odd that Grbl wouldn't calculate the correct feed rate but CoreXY isn't very common.

ggallant571

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Re: core-xy
« Reply #4 on: October 25, 2017, 02:06:44 PM »
Does grbl calculate the "true" feed rate for 45 degree cartesian moves?
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Lob0426

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Re: core-xy
« Reply #5 on: October 26, 2017, 12:28:49 AM »
There is a couple of settings in the grbl firmware for CoreXY did you set everything to CoreXY?
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ggallant571

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Re: core-xy
« Reply #6 on: October 26, 2017, 06:36:15 AM »
I think so. The x/y distances are good.
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