Converting an axis to belt drive

[Desertboy]

Hi,
I want to convert my bottom axis Axis, dual motor to belt drive.
I have 2 nema 23 4nm motors to fit on this axis over doubling the torque.
https://www.cnc4you.co.uk/Stepper-Motor/Nema23-4Nm/Stepper-Motor-4Nm-60BYGH401-03-Nema23

I have 2 questions
What T5 pulley should I use?
What T5 belt?

Will this Belt do?
https://www.cnc4you.co.uk/T5-Pulleys/Belts/T5-Timing-Belt-20mm

And are these pulleys even suitable?
https://www.cnc4you.co.uk/T5-Pulleys/Pulleys-with-Grubscrews/T5-Timing-Pulley-20mm-wide-tapped-with-grubscrews

I see grubscrew and think 4nm is a lot of torque to hold on 4 grubscrews.

[Doddy]

Hi,
I have 2 questions
What T5 pulley should I use?
What T5 belt?


Unhelpful answer, but why T5 and not e.g. HTD? or GT2?, improved backlash and better high speed performance (random google).

[Clive S]

I have 2 questions
What T5 pulley should I use?
What T5 belt?



HTD 5 would be a better belt and pulley

https://www.beltingonline.com/timing-pulleys-bars-272/

[Desertboy]

HTD 5 would be a better belt and pulley

https://www.beltingonline.com/timing-pulleys-bars-272/

Does size matter?

Thinking how many teeth and how wide the belt is. Guessing widest belt is better but pulley diameter not so important.

I have 4nm Nema 23's I want to run 1:1 gear ratio.

[johngoodrich]

I would personally run the smallest gear possible as there us less weight to turn

[Desertboy]

Wide and small?

[JAZZCNC]

First, convert to a belt drive from what.?

HTD is the belt to use. Pulley size will depend on how you do it and the resolution you want. Don't think because it's a 5mm pitch belt that's the actual pitch or linear movement you'll get because it's not. The diameter of the pulley x Pi is the actual pitch you'll end up with. So depending on how it's done and pully size you could need a gear ratio to give the resolution you need.!

[Desertboy]

First, convert to a belt drive from what.?

HTD is the belt to use. Pulley size will depend on how you do it and the resolution you want. Don't think because it's a 5mm pitch belt that's the actual pitch or linear movement you'll get because it's not. The diameter of the pulley x Pi is the actual pitch you'll end up with. So depending on how it's done and pully size you could need a gear ratio to give the resolution you need.!

Coupling driven, I'm upgrading the motors and would like to undersling the motors more for space than anything else, 1610 ballscrews.

I was going to run on a 1:1 ratio I was hoping it was a case of 2 matching pulley's just different ID mounts.

I'll get some photo's when it's light it becomes obvious in the day light.

I'm happy with 0.05mm resolution per step the 1610 gives me.

[Desertboy]

I found a (bad) pic of the motor mounts, I ditched those flexible couplings as soon as I actually tried to use the machine. Having cutting problem, they were the first thing I replaced.

27416

And one from when I was still building it, I have it on a catering table now and connected to a DDCSV.

27417 you can see the mounts better.

I want to flip the motor mount upside down, then mount the motor under the machine. The motor mount has 4 mounting holes which align with 4590 aluminium track. I can slide the mount left and right to tension the belt before bolting down with T nuts.

Motor mount is 10mm thick aluminium plate NOT ecocast.

I have the machine in a van so undersling the motors will create me a little more space and protect the motors.

I have bolted an extra piece of 4590 behind the machine to space it off the ply.

That groove isn't from the machine but it does line up perfectly LOL.

[Desertboy]

Would something like this be suitable with the right bore for the Nema's and Ballscrew?

https://www.beltingonline.com/16-tooth-htd5-pulley-16-5m-25f-7792

[JAZZCNC]

Ok I misunderstood. Thought you were converting completely to belt drive not just wanting to connect motors. Forget what I said that doesn't apply in this case.

Still use HTD thou.

[AndyUK]

I'm using 18 tooth HTD pulleys for exactly this from belting online with 2x M4 grub screws. Seem to do the job so far. Model number (18-5M-15F) (HP18-5M-15F)

I think I remember from figuring it out at the time you want as many teeth in contact with the belt at once to reduce backlash, so larger pulley the better, but also you want flexibility to increase or reduce the ratio later on without having to buy all new pulleys for everywhere.