Okay, I just tested these relays, https://amzn.to/47AuPBc . Mike’s idea… They work perfectly. I feel no hesitation to engage as a brake and it opens before the board boots, steppers works as expected. I can check anything you think I might have missed. So now can we use this and make it better. @M…

maybe it is to use a titanium plate and move the steppers to the frame and then the weight won’t be an issue. Either way it is challenging problem.

Anything you do to ‘harvest’ the energy will result in less braking torque. Just shorting the motor coils will produce the highest torque opposing the fall. I’m 100% confident that the e-brake can be easily designed and made and should be about as reliable as possible. It’s really just nailing do…

[image] orob: wouldn’t that be 15 lbs if you have 3 motors? assuming the load was perfectly evenly distributed, and there is no wind resistance and friction is negligible. That was for all three combined, not a single stepper. [image] Jono: If anything, that’s a much easier case to apply…

[image] Ryan: So we are at wobble prevention, or e-brake. Sorry, Wobble prevention, e-brake, or constant tension spring.

[image] Ryan: 20T has a radius of 12.22 mm 80T has a radius of 50.42 mm That’s a ratio of 4.13. I would have expected the tooth radius to be the important ratio, in which case 80:20 translates to 4:1 I just happen to have a few 252mm looped belts here, they were supposed to be for a diffee…

I won’t pretend like I’m an expert in this, so someone can correct me if I’m wrong/misremembering… Gear reduction is only related to speed. Speed and torque are inversely related. Torque is based on the moment force, in which the radius of the pulley is what drives the reduction ratio Now that b…

[image] Dan: I would have expected the tooth radius to be the important ratio, in which case 80:20 translates to 4:1 I do think that is what matters, the radius is probably 4:1 if you get the exact tooth midline.

Man you guys are making my head hurt. :rofl: I bet that’s why they do the gantry instead of the bed. I can’t imagine a 350x350 3/8” MIC6 bed and heater being light at all. But I could see 5 lbs being plenty to hold the gantry up

[image] Ryan: I do think that is what matters, the radius is probably 4:1 if you get the exact tooth midline. Everyone is making it more complicated than it is. The pulley tooth count is what matters. The belt is a constant, and the pulleys have matching teeth cutouts. The mechanical ratio…

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E-Brake for Belted Z axis

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