thanks for the links Steve, i'll look at them later tonight when i get back online again. i was looking at some threads on where some where talking about using wiper motors and hacking servo's but they didn't say anything about an amplifier (i may have missed that due to skimming and saving the site to read over them later). when i was seeing "Hack" i was thinking the meant more on the lines of having to get further into the control board such as programing, (something i know nothing of) or at the very least altering the board in some way (one of the reasons i was wondering about going linier). would a larger, sail servo (i think that's what thy are called) be more practical for this (wiper motor)application? as for the amplifier, that's just so one can power the wiper motor directly, right? what about using relays instead, wouldn't they do about the same job this way they could handle more current better than a circuit board? chris In a message dated 3/26/2014 10:02:47 A.M. Eastern Daylight Time, [email protected] writes:
Chris, For wheeled steering, no matter the mechanics (linear or rotary actuation), you will want to implement a closed loop control system. In other words, an R/C servo setup. If you take a servo apart, you will have a control board, a motor, and a feedback potentiometer (or pot). It's this pot that tells the control board where the output shaft is located. Since most hobby servo's are to small to handle the steering for our scale vehicles, one needs to build a Jumbo servo. You can hack a standard servo by adding an amplifier stage to power a larger motor or just get one of several commercial products meant for building bigger servos. These boards can be interfaced into practically any DC gearmotor and off the shelf pot to make a super ser vo. Peruse through the following sites to learn more. http://en.wikipedia.org/wiki/Servo_(radio_control) http://rcpowerservo.com/ http://www.pololu.com/category/95/pololu-jrk-motor-controllers-with-feedback ST On Tuesday, March 25, 2014 10:38:58 PM UTC-4, [email protected] wrote: so anyone have any idea on how to make it self center? In a message dated 3/24/2014 7:13:17 P.M. Eastern Daylight Time, [email protected]_ (javascript:) writes: recently during one of my boring moments sitting here on line, i saw a some of sketches for a wheeled vehicle i work on from time to time and continued the thought..... i all ready worked out the basics for the upper and lower control arms, how to make them pivot, i worked out how i would make the spindle/hub/block thingie for where the wheels/hubs would mount as well as figured out (3 quick doodles later) the best way to make it have steering for the powered wheels making for an all powered wheeled vehicle (i think i even have the suspension worked out, i just have to hit home depot at some point) ........ but that just left the one big thing, how to steer it. i saw the threads for using a wiper motor and at the moment that seems to be about the most basic way to go (plus the "whatever stuff" for making it auto center afterwards like a servo) ..... a bit over my head for the moment i guess, but was just thinking, what about one of the linier drive thingies? them things with the long worm screw powered by a geared motor? other than space being a possible restriction, would they be any easier to work with? would they offer better benefits such as more torque? or would it just be harder to work with? -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]_ (mailto:[email protected]) . For more options, visit https://groups.google.com/d/optout. -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
