Welcome! Log In Create A New Profile

Advanced

Dual motor and belt on Z

Posted by Blackgnome 
Dual motor and belt on Z
November 28, 2017 05:07AM
Any comments on the idea of using dual motors for Z and connecting them with a belt ?
Is this like begging for problems in case of 1 motor missing a step or could this help
kepping the bed in level even if 1 motor skips a step or 2 ?
Re: Dual motor and belt on Z
November 28, 2017 05:21AM
Good solutions are:

A. A single Z motor, driving 2 or 3 screws through pulleys.

B. 2 or 3 Z motors driven from separate stepper drivers, and use firmware and a Z probe to perform automatic levelling after homing (the firmware adjusts the Z motors individually to get the bed level).

Both of these solutions avoid the problem of multiple Z stepper motors getting out of sync.

Regarding your suggestion of dual Z motors connected by a belt, that should be viable. Motors slip 4 full steps at a time, not 1 full step, so the pulleys need only be large enough to constrain the relative movement to within +/-2 full steps. Using 1.8deg motors, this is +/- 3.6 degrees. The tooth width of a 20-tooth pulley is 9 degrees; so 20-tooth pulleys should be sufficient if the belt is tight.

However, if you will be using a belt and pulleys, why not use just one motor?

Edited 3 time(s). Last edit at 11/28/2017 05:25AM by dc42.

Delta printer calibration calculator, mini IR Z probe, and colour touch screen control panel: [escher3d.com]

Large delta printer, and other 3D printer blog postings: [miscsolutions.wordpress.com]

Disclosure: I have a financial interest in sales of the Panel Due, Mini IR height sensor, and Duet WiFi/Duet Ethernet [www.duet3d.com].
Re: Dual motor and belt on Z
November 28, 2017 05:40AM
Got plenty of steppers/leadscrews/pullys/belts and probe solutions laying around, building a corexy just for fun and to try out diffrent solutions atm and this just got me thinking that 2 should give some extra torque for those Heavy lifting/holding jobbs winking smiley

So it is possible and should not be a problem, will try this to see how it goes. Worst case I´ll just use the good old 1 motor/pulleys/belt solution.

Thanks.
Re: Dual motor and belt on Z
November 28, 2017 01:02PM
Quote
Blackgnome
Got plenty of steppers/leadscrews/pullys/belts and probe solutions laying around, building a corexy just for fun and to try out diffrent solutions atm and this just got me thinking that 2 should give some extra torque for those Heavy lifting/holding jobbs winking smiley

So it is possible and should not be a problem, will try this to see how it goes. Worst case I´ll just use the good old 1 motor/pulleys/belt solution.

Thanks.

This solution is old because it is good ! Like the round wheel is still with us while all the inventors of the square wheel have been quickly forgotten. It is why they keep popping up regularly smiling smiley


"You failed to maintain your weapon, son" (Harry Brown )
Re: Dual motor and belt on Z
November 29, 2017 01:24PM
If you need more power, using 1 motor give you the opportunity to gear up. Use a small pulley on the motor, and larger ones on the screws. It lowers maximum speed but this isn't important on Z. Also still cheaper then 2 motors.
Re: Dual motor and belt on Z
December 02, 2017 10:52PM
Quote
MKSA
Quote
Blackgnome
Got plenty of steppers/leadscrews/pullys/belts and probe solutions laying around, building a corexy just for fun and to try out diffrent solutions atm and this just got me thinking that 2 should give some extra torque for those Heavy lifting/holding jobbs winking smiley

So it is possible and should not be a problem, will try this to see how it goes. Worst case I´ll just use the good old 1 motor/pulleys/belt solution.

Thanks.

This solution is old because it is good ! Like the round wheel is still with us while all the inventors of the square wheel have been quickly forgotten. It is why they keep popping up regularly smiling smiley

Skateboarders that have tried them swear by them! (Truth is often stranger than fiction: wheels that are both square AND round!)
I have no connection to the sellers or creators or any financial ties, I just couldn’t resist responding winking smiley

[www.amazon.com]
Re: Dual motor and belt on Z
December 03, 2017 12:33AM
Quote
Blackgnome
Got plenty of steppers/leadscrews/pullys/belts and probe solutions laying around, building a corexy just for fun and to try out diffrent solutions atm and this just got me thinking that 2 should give some extra torque for those Heavy lifting/holding jobbs winking smiley


Have you considered a belt-lifted Z axis?


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: Dual motor and belt on Z
December 03, 2017 05:32AM
Instead of two motors you should use a single one with sufficient power. There simply is no need for a second one since the leadscrews will lock anyway (except if you use the wrong ones) and the power required for lift should usually does not exceed what a 1.7A NEMA 17 can deliver.


[www.bonkers.de]
[merlin-hotend.de]
[www.hackerspace-ffm.de]
Re: Dual motor and belt on Z
December 03, 2017 06:27AM
Quote
JonathanThompson
Quote
MKSA
Quote
Blackgnome
Got plenty of steppers/leadscrews/pullys/belts and probe solutions laying around, building a corexy just for fun and to try out diffrent solutions atm and this just got me thinking that 2 should give some extra torque for those Heavy lifting/holding jobbs winking smiley

So it is possible and should not be a problem, will try this to see how it goes. Worst case I´ll just use the good old 1 motor/pulleys/belt solution.

Thanks.

This solution is old because it is good ! Like the round wheel is still with us while all the inventors of the square wheel have been quickly forgotten. It is why they keep popping up regularly smiling smiley

Skateboarders that have tried them swear by them! (Truth is often stranger than fiction: wheels that are both square AND round!)
I have no connection to the sellers or creators or any financial ties, I just couldn’t resist responding winking smiley

[www.amazon.com]

Yet an hybrid but anyway, fame at last, after more than 5000 years of trying smiling smiley

Edited 1 time(s). Last edit at 12/03/2017 06:29AM by MKSA.

"You failed to maintain your weapon, son" (Harry Brown )
Re: Dual motor and belt on Z
December 13, 2017 04:37AM
Quote
Srek
Instead of two motors you should use a single one with sufficient power. There simply is no need for a second one since the leadscrews will lock anyway (except if you use the wrong ones) and the power required for lift should usually does not exceed what a 1.7A NEMA 17 can deliver.

Ordered a extra Nema 17 with almost twice the Power just in case. This is at the moment a build for testing ideas on, considered a beltdriven Z but will be a later test.
Sorry, only registered users may post in this forum.

Click here to login