Ballscrew Thickness!

[AdCNC]

hmmm ive already got the drives and motors from kelling in the states, the motors and drives are the 425 oz-in motor and KL-4030 Bipolar Driver the drive features are ..

* Voltage up to 24 to 40VDC, current output up to 3.0 A
* Selectable resolutions, 1,1/2, 1/4, 1/8, 1/16, 1/32, 1/64
* Suitable for 4,6,8 lead motors
* DIP switch current setting:
0.9A,1.2A,1.5A,1.8A,2.1A,2.4A,2.7A,3.0A
* Over voltage, heat and short-circuit protection

If i did end up gearing the ballscrew with some kind of belt and belt grip was a issue i could devise some sort of roller bearings in between the two pulley wheels so it would wrap the belt more so around the small drive pulley! just a thought, i suppose that all depends on what hight the teeth were on the pulleys and belt.

[John S]

I think you need to come to accept realistic terms with what you have.
Running large 25mm screws at high speed with these motors and drives isn't going to happen.

You have a 6 volt motor that to accelerate up to speed is expecting to see 6 x 20 volts or around 100 to 120 volts and you only have a 40 volt max supply that is really only going to be happy on about 32 to 35 volts to stay inside a decent safety factor.

Gearing up, then micro stepping will only bleed off available torque making the situation worse.

.

[Gary]

Those motors and drivers will be way too small.
If you are going to spin a 2500mm x 25mm screw you need a large 34, and a good supply of volts.
Under the speed you need those motors will most likly be only giving about 1Nm, also the inertia mismatch is way to large, even if you gear it.

hmmm ive already got the drives and motors from kelling in the states, the motors and drives are the 425 oz-in motor and KL-4030 Bipolar Driver the drive features are ..

* Voltage up to 24 to 40VDC, current output up to 3.0 A
* Selectable resolutions, 1,1/2, 1/4, 1/8, 1/16, 1/32, 1/64
* Suitable for 4,6,8 lead motors
* DIP switch current setting:
0.9A,1.2A,1.5A,1.8A,2.1A,2.4A,2.7A,3.0A
* Over voltage, heat and short-circuit protection

If i did end up gearing the ballscrew with some kind of belt and belt grip was a issue i could devise some sort of roller bearings in between the two pulley wheels so it would wrap the belt more so around the small drive pulley! just a thought, i suppose that all depends on what hight the teeth were on the pulleys and belt.