What's the best way to replace a small motor gearbox with pulleys?

[Osman Eralp]

I've been experimenting with using pulleys and belts for a robot drive train. My experiences so far are very positive: belts are quiet and seem to have less backlash than gears  I'd like to design an all belt and pulley drive train. My only problem is finding a pinion pulley that fits that shaft of small motors. The smallest pulley that I found has a bore of 3.2 mm. That would be fine for an RS550 size motor, but smaller motors have shafts that are 1 or 2 mm. Do I need to use a pinion gear for the first stage, or is there an all-pulley solution for small motors?

TIA

Osman 

[Michael]

I'm not sure what type of belts you are using, but http://sdp-si.com has timing pulleys with bore diameter down to 2mm.

Cheers,

Michael

Osman 

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[KM6VV]

Sounds like a small motor.  Try Stock Drive Products?  .080mm belt pitch stuff (If I remember correctly).

 

Alan  KM6VV

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[Maddox.Robert]

I recall from a past job using Berg for small components including belts and hubs.

[Butokim]

Osman,

 

An effective work-around would be to take the pulleys you have and fill the existing bore with good epoxy then rebore them.

 

James M. Geidl, K6JMG
D.B. Cooper, you have  a message.
 

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From: hbrob...@googlegroups.com [mailto:hbrob...@googlegroups.com] On Behalf Of Osman Eralp
Sent: Tuesday, April 30, 2013 1:37 PM
To: hbrob...@googlegroups.com
Subject: [HBRobotics] What's the best way to replace a small motor gearbox with pulleys?

I've been experimenting with using pulleys and belts for a robot drive train. My experiences so far are very positive: belts are quiet and seem to have less backlash than gears  I'd like to design an all belt and pulley drive train. My only problem is finding a pinion pulley that fits that shaft of small motors. The smallest pulley that I found has a bore of 3.2 mm. That would be fine for an RS550 size motor, but smaller motors have shafts that are 1 or 2 mm. Do I need to use a pinion gear for the first stage, or is there an all-pulley solution for small motors?

TIA

Osman 

--

[Ted Larson]

Osman,

 

I have had really good luck with 0.080” pitch MXL sized timing belts and tiny little motors.  The 10, 12, 14 tooth pulley’s are still pretty big even though the shaft might be tiny.  I have just 3D printed them no problem.  .  Make the bore undersized so you can do some minor-drill out, and press fit it on.   Just bring over some STL files with an assortment of them,  and we can whack it out on the printer really quick.

 

Thanks,

 

-Ted

 

 

 

 

From: hbrob...@googlegroups.com [mailto:hbrob...@googlegroups.com] On Behalf Of Osman Eralp
Sent: Tuesday, April 30, 2013 1:37 PM
To: hbrob...@googlegroups.com
Subject: [HBRobotics] What's the best way to replace a small motor gearbox with pulleys?

 

I've been experimenting with using pulleys and belts for a robot drive train. My experiences so far are very positive: belts are quiet and seem to have less backlash than gears  I'd like to design an all belt and pulley drive train. My only problem is finding a pinion pulley that fits that shaft of small motors. The smallest pulley that I found has a bore of 3.2 mm. That would be fine for an RS550 size motor, but smaller motors have shafts that are 1 or 2 mm. Do I need to use a pinion gear for the first stage, or is there an all-pulley solution for small motors?

 

TIA

Osman 

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[robotMaker]

I too have done that, and it worked for me.

Cesar

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From: Butokim <but...@gmail.com>
To: hbrob...@googlegroups.com
Sent: Tuesday, April 30, 2013 5:41 PM
Subject: RE: [HBRobotics] What's the best way to replace a small motor gearbox with pulleys?

[Chris Tacklind]

Have you considered a "rolling drive".  See
https://www.facebook.com/photo.php?v=10152066732312715
https://www.facebook.com/photo.php?v=10152066728517715

Some might call this a "friction drive" but as there is no sliding contact, I think that is a misnomer.

No gears, no belts, no backlash!  Quiet too.

-Chris

On Wed, May 1, 2013 at 6:54 AM, <hbrob...@googlegroups.com> wrote:

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• What's the best way to replace a small motor gearbox with pulleys? [6 Updates]

 What's the best way to replace a small motor gearbox with pulleys?

Osman Eralp <osman...@gmail.com> Apr 30 01:37PM -0700