1st Build, Steel, Epoxy 24"x24" for Wood

I'd try the setup as is. The worst case scenario is the belt flaps far too much and causes resonance problems, and you then have to add some idler pulleys.

If it does need a couple idlers added, I would probably add a couple rollers to the top, to drop the belt down in the middle and increase wrap on the ballscrew pulleys.

Rigged up a tensioner using stuff on hand - including a Subaru timing belt idler bearing:

Attachment 23897

First movement!!!

https://youtu.be/HMjVgd4S_KA

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First movement!!!

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I don't think it will cut anything without a Z axis:applause:

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Originally Posted by wallyblackburn

Rigged up a tensioner using stuff on hand - including a Subaru timing belt idler bearing:

Attachment 23897

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Be careful not to over tension because will deflect the ball screws causing whip when at opposite end of travel. It would have actually been ok without a tensioner thou it's better down out of the way.

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Originally Posted by wallyblackburn

First movement!!!

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Thats not movement that's a twitch.!. . . . Let it have it's head to shake the gremlins out.:smiley_simmons:

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Originally Posted by JAZZCNC

Be careful not to over tension because will deflect the ball screws causing whip when at opposite end of travel. It would have actually been ok without a tensioner thou it's better down out of the way.

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Interesting. I’ll back off the spring pressure and adjust as needed when it’s actually working.

Thanks!


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Originally Posted by wallyblackburn

Interesting. I’ll back off the spring pressure and adjust as needed when it’s actually working.

Thanks!


Sent from my iPhone using Tapatalk

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Yes, that long run of belt, I would have probably around 10mm of easy deflection in it - you really do not want to "twang" timing belts like guitar strings ;)

As long as they are not flapping in the breeze, the tension does not affect accuracy as much as you might think, but it will wear things out, cause resonance and generally not be good.

What do you guys typically use for steps per revolution on your drivers?

Thanks,
Wallace

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Originally Posted by wallyblackburn

What do you guys typically use for steps per revolution on your drivers?

Thanks,
Wallace

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Totally dependant on the mechanical setup - pulley sizes etc