Subject:
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Re: Using one motor to do 2 things...
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 27 Oct 2000 19:19:43 GMT
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Viewed:
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1997 times
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Hi Jason
It's a Friday night and my mind has disengaged so I've not totally thought
these through, but you could try a combination of ratchets and directional
gearboxes (as seen in the Unofficial guide to Lego Mindstorms by J Knudsen).
Basically you have one input shaft and two output shafts. The input shaft
drives a swinging arm and the drive train. So if you turn the motor one way
then the swinging arm moves to one side and drives output shaft 1 and if you
turn the motor the other way then the arm swings in the other direction and
drives output shaft 2. You could also try a ratchet on one axle so if you
reverse then the wheel on that side is locked (as in Robo 2 in RIS 1.0
Constructopedia) or possibly a ratchet onto a differential.
Anyway, just some thoughts for you to try. I'm sure someone else will give
you a more detailed plan or as normal some nice person normally has the idea
on a website somewhere. This isn't a particularly uncommom problem. Can I
extole the virtues of another RCX though - much more fun ;-).
Mike
In lugnet.robotics, Jason Rowoldt writes:
> Hello Mindstorms fans,
>
> I am suffering through a bit of an engineering block. Let me explain:
>
> I had an idea to build a drivetrain that will provide both front/back movement
> and left/right(turning) movement off one motor. My question is: is this
> possible? It's hard to draw this in ASCII so let me try to explain.
>
> * If you use a motor for front/back, you can configure an axle to also provide
> left/right movement through an (I'm not sure of the technical name here)
> inverse of the gear (one of the gears that has teeth only on one side). But if
> you do this, it means that anytime your chassis is going say, forward, it is
> also going, say, left. In the other direction, the chassis will go backwards
> and right. This will cause the chassis to do continual 3-point turnarounds.
>
> *The way to overcome this is to disengage the gear that makes the axle (and
> thus wheels through rods) from the main drivetrain (the part that makes the
> chassis go forward/reverse). However, I cannot think of a way to do this
> without another motor.
>
> The short question of this is: Is there any way to use one motor to do both
> forward/reverse and turning capability? Since the RCX has only 3 output ports
> and I need 2 other outputs for something else, that means buying another RCX.
> $$$$:(
>
> Looking forward to any ideas from the experienced LEGO engineers out there.
>
> Jason, building a protoype battle robot.
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Message has 1 Reply:
 | | Re: Using one motor to do 2 things...
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| Stupid me I just thought of another problem that makes this an engineering impossiblity (I think). How to reverse directions of the left/right action? It seems making the forward/backward motion and the left/right motion on the same motor is (...) (26 years ago, 27-Oct-00, to lugnet.robotics)
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Message is in Reply To:
| | Using one motor to do 2 things...
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| Hello Mindstorms fans, I am suffering through a bit of an engineering block. Let me explain: I had an idea to build a drivetrain that will provide both front/back movement and left/right(turning) movement off one motor. My question is: is this (...) (26 years ago, 27-Oct-00, to lugnet.robotics)
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