Low cost 0 backlash transmission - Ball bearing + trapezoidal screw

[Jonathan]

Your not agreeing with me are you.

I use these belts on my lathe the Z is about 300mm BC

I was cutting some tool steel and a bit too hard it pushed the bar in the lathe chuck but the pulleys are about £30/40 each, built it has awesome power. Backlash is 0.05mm

Phil

Sorry maybe I came across wrong there - I meant to agree with you!
I meant to say that the laser cut pulleys and only 5mm wide belts were not good.

I've used XL pulleys and 1/2" (some bigger) belts on my machines. HD belts would be nice...

...better than the X-axis nuns.

Just noticed that typo I made - oops!

[M250cnc]

Jonathan

I was joking, as we always seem to be at loggerheads.

Phil

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[LabSkis]

Thank you all!
Jonathan,
You have done exactly what I intend to do.
Except that I was going to use an ACME rod.

Where did you find this thing on the picture, enclosing the ball bearing?
Did you get it machined?



Laurent

[Jonathan]

Where did you find this thing on the picture, enclosing the ball bearing?
Did you get it machined?

I cnc milled it on my machine. I can send you the drawing/Gcode/make another if you like. I made it that slightly odd shape to fit in a tight space on the Z-axis before changing the router design somewhat and using it on Y. If I did another for the Y I would leave more material there for the bolts, and put a spring/belville washers on the bolts so that it rides over imperfection in the screw,

[LabSkis]

OK. Thanx for your proposal.
But I have nothing around here to get this thing machined.
For the moment, I think I will stick to 0 backlash nuts like the one you find on dumpster cnc.
Yet, do you think it has a real advantages on those nuts in terms of backlash or friction? Despite the Acme being worn by the roller bearing?