Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: silo_xtreme on June 08, 2008, 09:26:47 PM
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Hey All,
I'm trying to slow down a motor via belt and pulley (lighter, cheaper, etc..). The problem I'm running into is that I'm trying to achieve a high ratio (i.e. 20:1, 30:1) and the best differences between 2 pulleys that I have been able to find are 5:1 - 7:1 between sdp-si.com and mcmaster.com. I'm just wondering if anyone has come across a similar problem and decided to use multiple pulleys or have found the proper products some where?
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What kind of motor are you trying to slow down? It's a bit hard to give a solution without that knowledge. I'm guessing it's big if you are using pulleys and belts to slow it down?
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Hi Six, my bad...
It's a brushless motor with 1500 (max load) to 3000 (max eff) RPM, that i'd like to slow down and get more torque. The shaft is 8mm (actually, it's 8mm with a 1.5mm cut on one side).
Yes, I would like to achieve a 20:1 - 30:1 ratio.
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Look at companies like motion industries or boston gear that deal exclusively with power transmission.
For a 20:1 you will probably have to use 4 pulleys.
(http://www.hobbyplace.com/images/tamiya/science/tamx7121.jpg)
Two 5:1 pulley systems = 25:1
bear in mind that as the input torque increases, so do the size of the belts and pulleys.
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Bukowsi,
Perfect! Just the confirmation that I was looking for.
Thank You! ;D