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

[wallyblackburn]

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

[wallyblackburn]

First movement!!!

[Clive S]

First movement!!!

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

[JAZZCNC]

First movement!!!

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

[JAZZCNC]

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

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.

[wallyblackburn]

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.

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

Thanks!


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[Davek0974]

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

Thanks!


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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.

[wallyblackburn]

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

Thanks,
Wallace

[Davek0974]

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

Thanks,
Wallace

Totally dependant on the mechanical setup - pulley sizes etc

[JAZZCNC]

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

Thanks,
Wallace

Step per rev isn't a setting you can pick or choose. It's an absolute calculation that is derived from several factors. The pitch of the ballscrew, Microsteps set on drives and any mechanical ratio.

If your unsure mach3 can do this for you. Go to settings tab and just above Reset you'll see Set Steps per button. Click this and select the axis want to set. It will then ask for distance to move. Enter a value, make it small to start with, then measure how far it actually moved and enter the amount. Mach3 will then calc and set the steps per for you.
Do this for each axis using a small value to start then repeat and set over a longer distance. Very important you measure accurately.