Rotating Ballnut - design ideas

[teamloks]

HI JAZZ thanks for your insight regarding my question just talk with my ball screw supplier he suggest me to use 4040 for 3.2meter axis and 3232 for 2 meter axis..and i might follow their suggestion regarding that if budget is not constraint..anyway maybe i opt for 3232 all axis 4040 is really expensive

[JAZZCNC]

HI JAZZ thanks for your insight regarding my question just talk with my ball screw supplier he suggest me to use 4040 for 3.2meter axis and 3232 for 2 meter axis..and i might follow their suggestion regarding that if budget is not constraint..anyway maybe i opt for 3232 all axis 4040 is really expensive

Do they know you are rotating the nut and tensioning the screw.? Makes big difference.
This is the first 10x5 machine using rotating ball-nut I've built, I've built plenty of 8x4 and the difference between them really surprised me.

The secret is keeping the nut rotation speed down and getting a good tension on the screw with nice straight pull.

Good luck

[teamloks]

Do they know you are rotating the nut and tensioning the screw.? Makes big difference.
This is the first 10x5 machine using rotating ball-nut I've built, I've built plenty of 8x4 and the difference between them really surprised me.

The secret is keeping the nut rotation speed down and getting a good tension on the screw with nice straight pull.

Good luck

do you use BK/Fix unit on both end side?

[JAZZCNC]

do you use BK/Fix unit on both end side?

Don't need end bearings because not spinning the screw. The ends need to be either externally threaded or internally-threaded so you can tension the screws. I've used both methods on different machines and prefer externally threaded as can get more torque.
The force required to take Sag out over 10ft is considerable so make sure the brackets holding the ends are substantial and adjustable so can align screw in two planes.