A servo would probably be simpler but more expensive On 2014-03-26 2:14 PM, "Derek Engelhaupt" <tan...@gmail.com> wrote:
> 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.comwrote: >>>>> >>>>>> 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. > 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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