continuous rotation servo or motor with motor controller

D Faust

I need·some motors or continuous rotation servos that can move at 114 rpn or 60 degrees per .13 seconds.· Of course it needs to have enough torque to move the robot ~2-3 lb.· At the moment I do not have a motor contoller or motors but I do have Parallax's continuous rotation servos that come with the boe-bot.· I am not just trying to make a fast boe-bot, so don't base assumptions on that.· Would I be better of buying a fast continuous rotion servo (where can I get some),·buying fast regular servos and modifying them (agian where can I get fast servos), or should I buy a motor controller (I was thinking of the Pololu Micro Dual Serial Motor Cotroller for cost reasons) and dc motors with gear boxes?· My budget is tight so please keep that in mind.· Any suggestions on motors, motor controllers, other ways to control motors in two directions at varying speeds,·servos, and places to get them would be very useful.· Thank You in advance.· (I am not an expert, I am just starting, and I am attempting to build my knowledge base)

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D Faust

Franklin

For the speed and power you will probably need dc motors and gears. find the motors that will work for you first then find a controller that will handle those motors.

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- Stephen

D Faust

Continuous rotation servos are jst geared dc motors with motor contollers. correct? Are speedy and powerful servos not in production? Can the power for the logic and the power for the actual servo be separated, so that a more powerful motor can be hooked up to the controller part? Any ides for motor contollers other than the HB-25, Motor Mind B, and Pololu Micro Dual Serial motor controllers sold by parallax.· What about motors?· Does anybody have an estimate of how much torque it would take to move a 2-3 lb bot without sacrificing a lot of speed?· I just found a website that will calculate the amount of torque your·motor needs to have, the weight the robot can be, and the diameter wheel you should use.· It is: "http://www.electrotank.com/lab/personal/mike/robot/Calculators.html"

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D Faust

Post Edited (D Faust) : 5/8/2007 12:08:28 AM GMT

Franklin

How about www.google.com/search?q=dc+motor+controller&rls=com.microsoft:en-us&ie=UTF-8&oe=UTF-8&startIndex=&startPage=1

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- Stephen

Joe "Bot" Red

Hey DFaust, I see you were looking for a Fast and Strong continuous rotation servo.... I found one that is a close match to what you need, and although it is not a continuous rotation servo... it is very simple to modify into one.... I know because I just modified one and it works perfectly.... here it is:

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXLN94&P=ML

It is the Tower Hobbies TS-80 (which is the same as a Hobbico CS-80) it is rated at Speed: 0.14 sec/60° and a monstrous 343 oz-in (24.7 kg-cm) Torque

I just modified one, and I will be modifying the other one and I will creating the instructable for the modification and posting it on my web page...

I hope this helps!!.. Happy Roboting!!.. Jose

Joe "Bot" Red

As promised, here is the link to the "instructable" on how to modify a Hobbico CS-80 - Tower Hobbies TS-80 for continuous rotation....

http://joebotics.googlepages.com/continuousrotationservo-hobbicotowerhobb

Here is a short video with the servo in action:
http://www.youtube.com/watch?v=0_UJuNmoSsQ

Happy Roboting!!... Jose

Post Edited (Joe "Bot" Red) : 7/11/2007 2:50:41 AM GMT

D Faust

Thanks for all of the help Jose. Right now I am leaning on more of the fast side because I want to build a small, quick robot, but this will definitely help me in the future, thanks.

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D Faust