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In lugnet.technic, Steve Hassenplug wrote:
> In lugnet.technic, Duane Hess wrote:
> > Has anyone been able to drive two seperate outputs with a single motor? Here's
> > what I'm looking for advice on:
> >
> > Step One:
> > Motor and Outputs A and B are all in their Home position.
> >
> > Step Two:
> > Motor is manually turned on and Output A is driven to it's limit.
> >
> > Step Three:
> > Motor continues to run, driving Output B to it's limit. Both Outputs are now at
> > the limit of their travel and the motor is manually switched off.
> >
> > Step Four:
> > Motor is manually turned on and Output B is driven back to it's home position
> >
> > Step Five:
> > Motor continues to run, driving Output A to it's home position. Both Outputs are
> > now at their Home position and the motor is manually switched off.
>
>
> One way to do that is to have a rubber-band/spring/shock holding "Output B" in
> it's starting position. Then, you can use a differential to move both A and B.
>
> Going forward, A will be easier to drive, so it will push A to it's limit, then
> B will start moving (and stretching the rubber band).
>
> Going backward, the rubber band will pull B back to the start first, then A will
> follow.
>
> The key is having the differential drive both, and setting B so it "wants" to be
> at the starting position.
>
> Steve
You also might check out a construct called a Directional Transmission. This is
a simple setup using a sliding worm gear that does pretty much what you are
describing. Michael Powell has a web page describing his design that I used
successfully to build a robot arm that used a single motor to perform two
actions: (1) grip+release and (2) lift+drop.
http://www.sonic.net/~rci/transmission.htm
There have also been several discussion threads here on LUGNET about how to use
this nifty mechanical construct. I did a LUGNET search on the words
"directional transmission" and found a few threads that may or may not add
useful information for you:
http://news.lugnet.com/build/?n=3321
http://news.lugnet.com/robotics/?n=8587
http://news.lugnet.com/robotics/?n=6190
http://news.lugnet.com/robotics/?n=11831
There are others, but these are a start. Hope this helps!
- Chris.
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Message has 1 Reply:
 | | Re: One Input - Two Outputs?
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| (...) That's one of the links I was trying to find the other day! Thanks. I'm not sure if it will do what I want, but I'll have to stare at it a while to find out. Keep the ideas coming, if there are more. -Duane (21 years ago, 12-Nov-03, to lugnet.technic, lugnet.robotics)
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Message is in Reply To:
| | Re: One Input - Two Outputs?
|
| (...) One way to do that is to have a rubber-band/spring/shock holding "Output B" in it's starting position. Then, you can use a differential to move both A and B. Going forward, A will be easier to drive, so it will push A to it's limit, then B (...) (21 years ago, 12-Nov-03, to lugnet.technic, lugnet.robotics)
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