Help specifying 2 meter long Ball screw for Z axis...

[disneytoy2]

Hello again!

So I'm working on a 2 meter tall project. I have a 30mm wide belt ordered I was planning on using for the Z-axis. Now I am having second thoughts and would like some advice on Diameter and pitch I should be looking for a ball screw option.

First, there will be no fast moves in the Z axis. Pretty much going from zero upwards every time say 1" Speed will be no issue.

So, I have been looking at 2,000mm Ball screws. There will be around 100-125lb payload. I may counterweight that is necessary. I have a Nema 34 motor already with a 14mm shaft. I may get a worm gear as a right angle.

So what diameter would suit such a project? Is there a specific pitch I should look for? Could I drive the Ball screw right from the Work Gear output?

And I Guess, I would just need a bearing pillow block at the top? Because of the weight, would you recommend a second pillow block to be like the anchor. Less stress on the worm gearbox?

Thanks

Randy

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[Jim Dawson]

A 1610 with a 2:1 belt reduction would be more than adequate given your low speed requirement, or even direct couple a 1605 to the motor shaft. More than enough linear force to handle 125 lbs.

Given your low accuracy, low speed requirement, I think a flange bearings would do fine. Not really designed for thrust, but they will actually take quite a bit, much more than the assembly could exert on it.

Now the real problem, how are you going to keep the abrasive clay off the the ball screw, and out of the lower bearing? That alone would cause me to look in another direction. My lathe has an extensive sliding shield system to keep the coolant and chips out, but the Z axis on my Haas mill has an exposed ball screw on the lower end and it does get splashed with coolant & chips, but that is really a pretty non abrasive environment.

[disneytoy2]

Jim you are great! My 30mm HTD5M belt came in yesterday. Seems a bit stiff but plenty strong for the Z axis. This is the white Poly belt, Maybe I should have bought the black rubber version. The Ball screw was just a thought, since I found some in 2 meter lengths not too expensive. I am working on the X axis as I call it and I wouldn't mind your thoughts on 3 or so options.

[Jim Dawson]

Happy I could help

I'll be happy to try to help guide you with the X axis.

[mactec54]

A 1610 with a 2:1 belt reduction would be more than adequate given your low speed requirement, or even direct couple a 1605 to the motor shaft. More than enough linear force to handle 125 lbs.

Given your low accuracy, low speed requirement, I think a flange bearings would do fine. Not really designed for thrust, but they will actually take quite a bit, much more than the assembly could exert on it.

Now the real problem, how are you going to keep the abrasive clay off the the ball screw, and out of the lower bearing? That alone would cause me to look in another direction. My lathe has an extensive sliding shield system to keep the coolant and chips out, but the Z axis on my Haas mill has an exposed ball screw on the lower end and it does get splashed with coolant & chips, but that is really a pretty non abrasive environment.

You would have a hard time finding a 2m long 16mm ballscrew they normally only go up to 1500mm

[Jim Dawson]

You would have a hard time finding a 2m long 16mm ballscrew they normally only go up to 1500mm

OK, 20-25mm then