Designing a Rotating Holder: Tips and Tricks

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Discussion Overview

The discussion revolves around designing a rotating holder that can rotate a full 180 degrees and stop precisely at the same position each time. Participants explore various methods and components for achieving this functionality, focusing on simplicity and cost-effectiveness.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant suggests using a stepper motor due to its ability to turn a specific amount within tolerances.
  • Another participant proposes a worm drive, noting it may not be fast but could work for the application.
  • A different approach involves using a DC motor with hard stops and limit switches to achieve the desired rotation.
  • One participant expresses interest in using a stepper motor with a 16 series PIC microcontroller, asking for tips on circuitry to ensure it rotates exactly 180 degrees.
  • Another participant mentions the need to connect more than three motors and considers building custom controllers for them, questioning if connecting the STEP line to the PIC pins would suffice.
  • Later, a participant decides to use a stepper motor controller chip (Phillips SAA1027) instead of building a controller, indicating a need for multiple chips to control four motors separately and asking for precautions.

Areas of Agreement / Disagreement

Participants present multiple competing views on the best approach to achieve the desired rotation, with no consensus reached on a single method or component.

Contextual Notes

Participants discuss various motor types and control methods, but the conversation lacks detailed specifications on the required precision and the exact nature of the holder's application.

Who May Find This Useful

Individuals interested in robotics, motor control, or DIY electronics projects may find the discussion relevant.

lankan_ice_405
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Hey,

I need to design somethign that rotates the holder drawn below, to a full 180 degrees and stops. And should be able to repeat that process as required. It should be also precise, that is, stop at the same place each time.

Any ideas on how to implement this? needs to be cheap and simple.


What kind of parts would I need and how would I put it together?
 

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A stepper motor? Stepper motors are designed to turn a very specific amount within tolerances.

Ask around at an electronic surplus store. You may have to build some sort of controller.
 
a worm drive might be OK. wouldn't be fast, tho.
 
From your description, you should be able to just use a DC motor with hard stops and limit switches.
 
I'm thinking of going the stepper motor route,
and I already have a 16 series PIC , any tips ?
how would I do the circuitry for it and make it go 180 degrees exactly?
 
lankan_ice_405 said:
I'm thinking of going the stepper motor route,
and I already have a 16 series PIC , any tips ?
how would I do the circuitry for it and make it go 180 degrees exactly?

http://www.mastincrosbie.com/mark/electronics/pic/stepper.html"
http://websupport1.citytech.cuny.edu/Faculty/fzia/weblinks/Stepper%20Motor%20Tutorials%20and%20Driver%20Circuits.htm"
http://www.parex.org/weblog/archive/000049.html"
 
Last edited by a moderator:
Since i need to connect more than 3 motors I'm thinking of making a few of my own controllers (4)
using this
http://www.aaroncake.net/Circuits/stepper.asp

If I went about that, all I would need to do is just connect the STEP line to the pins of the PIC and when required to move 1 of all of the motors juts send the pulses thru the Pic, correct?


Is that diagram one that would produce a good controller for what I need to do?
 
Actually I've changed my mind and I'm going to go with a Stepper Motor controller chip instead of building the whole thing. (The Phillips SAA1027) It'll cost ~the same
So I'll need to have 4x this because I need to control 4 different motors separately.

Any precautions or anything I should take?
 
n/m...
 
Last edited:

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