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Hy, can you send us picture of your breakout board. If you use cheap chinese version and connect only 12v power supply without 5v power supply over usb, steppers will go one direction only.
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I had few days ago the same problem with referencing y axis on tc240 without rotation. try reseating all connectors in el. cabinet.

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triming in 3d parametric software is a nono. try using splitting instead, I read/watched several tutorial and trimming is not a way to go. designing in 3d is way faster when get the hang of it...
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overvoltage deffinitely killed your capacitor, I believe 15v is max on cheap chinese BOB

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You can also use USB phone charger to supply 5 volts. you also need 12 volts to get inputs working, this is just a bug on BOB, I lost three days to find out I need both power supplies.

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why don't you send inquiry directly to siemens. They have tech support for such things

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I agree, definitely check datasheet, but I didnt encounter different type, so I didnt even think that different types exists (Im not an expert)

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Linear guides have same capacity in four directions, up, down, left, right. So if you dimension properly it doesnt matter if you hang weit or lean it on guides.

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Which software do you use for transfer, do you also generate nc code on pc? Also which software do you use? We have trumpf tc240 and we still program manually.

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I ran thru your videos and the amount of work in programming behind this must be huge. Its really cool robot! I tried to do similar thing several years ago but it ended up as not good enough to...