Sounds complicated...lol Derek
On Wed, Mar 26, 2014 at 12:43 PM, isaac goldman <panthergol...@gmail.com>wrote: > 1) because in the specific case of a stepper motor you can operate open > loop. So long as you know where you started and how many intervals youve > gone you know where you are... > > 2) any microcontroller these days can drive a stepper motor. Appropriate > control would ideally constitute a way to "zero" the motor's controller in > order to detect if a step was skipped, such as a magnet and hall effect > sensor on the shaft... > On 2014-03-26 12:03 PM, "TyngTech" <steve...@gmail.com> wrote: > >> "And as an aside you dont need a closed loop system; a stepper motor with >> appropriate controls will work fine" >> >> Since Chris is looking for self-centering, care to elaborate on why >> closed loop would not be needed? Also, for those that may not be as well >> versed in stepper drivers, care to list the "appropriate controls" to make >> a stepper motor function is this R/C controlled application? >> >> ST >> >> >> On Wednesday, March 26, 2014 11:05:00 AM UTC-4, True North Armouries >> wrote: >>> >>> You can for ~ 30$ on >>> hobbyking.com<http://www.google.com/url?q=http%3A%2F%2Fhobbyking.com&sa=D&sntz=1&usg=AFQjCNGM7FiZ5OPYL2izyuyjrVwqybeC5w>buy >>> servos with 30 to 40 kgcm of torque; the one i got for my turret zenith >>> has 40 kgcm or almost 3 ft-lbs. You no longer need to custom make a >>> solution. >>> >>> And as an aside you dont need a closed loop system; a stepper motor with >>> appropriate controls will work fine... >>> >>> >>> On Wed, Mar 26, 2014 at 10:02 AM, TyngTech <stev...@gmail.com> wrote: >>> >>>> 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 servo. 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, odyssey...@aol.com 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, >>>>> odyssey...@aol.com 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 rctank...@googlegroups.com >>>> To unsubscribe, send email to rctankcombat...@googlegroups.com >>>> 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 rctankcombat...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> >>> -- >>> Isaac Goldman >>> 5142334423 >>> >>> This message contains confidential information and is intended only for >>> the individual named. If you are not the named addressee you should not >>> disseminate, distribute or copy this e-mail. >>> >> -- >> -- >> You are currently subscribed to the "R/C Tank Combat" group. >> To post a message, send email to rctankcombat@googlegroups.com >> To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com >> 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 rctankcombat+unsubscr...@googlegroups.com. >> 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 rctankcombat@googlegroups.com > To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com > 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 rctankcombat+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- -- You are currently subscribed to the "R/C Tank Combat" group. 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