Society of Robots - Robot Forum
General Misc => Misc => Topic started by: j03yYunG on January 31, 2008, 08:38:46 PM
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Hi,
I'm looking to build a robot that will weigh about 120lbs and travel about 10mph.
Its going to sit on four 8" diameter wheels. I did some calculations, and I'm going to need at least a 420 RPM motor with about 4 lb*ft of torque. I've been looking all over the internet for 2 or 4 12v or 24v DC motor that will power this thing. I don't want the operating and stall current too high either. Can someone help me please. Any websites or motor lists will be helpful. Thanks.
ps: I'm not sure if my calculations are 100% correct. I used p = f*v (assuming 12lb force will be enough to push the 120lb robot). Then t = p/w (t=torque, p = power, w = angular velocity). :D
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cordless drill motor. good quality ones w/ standard planetary gearbox can do almost 500 in/lb
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cordless drill motor. good quality ones w/ standard planetary gearbox can do almost 500 in/lb
any specify one you would recommend? links or website please? thanks
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http://www.robotmarketplace.com/products/motors_main.html
or you could get some cheapo 18v drill for about $20-25, but it wont be as powerful and made in china quality
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http://www.robotmarketplace.com/products/motors_main.html
or you could get some cheapo 18v drill for about $20-25, but it wont be as powerful and made in china quality
I was looking at these motors and some of them need to much amps to operate. Like this one...
http://www.robotmarketplace.com/products/BP389010-00.html
68 amps to run it.. jesss..
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o yeah. that motor with no gearbox will move your robot. :o
look into the gearbox motors. they'll be geared down(lower rpm) like you need and will use less power and more torque. 12v will do. maybe even less.
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o yeah. that motor with no gearbox will move your robot. :o
look into the gearbox motors. they'll be geared down(lower rpm) like you need and will use less power and more torque. 12v will do. maybe even less.
I was acutally looking at these ones...
http://www.robotmarketplace.com/products/0-BHG20.html
But the site says its only for robots 12-15 lbs... I'm afraid the shaft will break if its on a 120lb robot. Is there anything I get do to use these motors in a bigger body? Oh and with these motors... how much do you think the rated torque is with the stall torque being 355 oz-in? There isn't any data sheets... :(
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ps: I'm not sure if my calculations are 100% correct
use this:
http://www.societyofrobots.com/RMF_calculator.shtml