Subject:
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Re: Multiple Output Gearbox
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 14 Feb 2000 19:47:47 GMT
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Viewed:
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656 times
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Sounds interesting. If you like, you can email the pictures to me, and I
will put them on display on my ISP's web server.
Arjen
"David Paule" <dpaule@diac.com> wrote in message
news:Fpw0Ay.1u9@lugnet.com...
> I made a simple gearbox that uses one motor to drive several output • shafts,
> all separately. A second motor selects between the outputs. Only one • output at
> a time can be used, so therefore the outputs aren't fully independent. But • for
> the one which is selected, it can be driven either way, set to freewheel • or
> stopped, if using NQC. And the gearbox can be expanded indefinitely.
>
> This doesn't use the gear-box hardware from the Space Shuttle or the • Supercar.
> Those are either restricted to two outputs or need a third motor to get • the
> cross-motion into the gear selector.
>
> I don't have a web site so there aren't any pictures. Sorry.
>
> Here's a conceptual description:
>
> All the outputs share one similarity: they have gears which are lined up • to
> mesh with a 16 tooth dark-gray idler gear when the idler gear slides along • an
> axle. The idler gear is part of a slider assembly which is driven by the
> second motor. In my prototype I used a flat rack gear on the slider • assembly,
> and drove it by turning an axle that had a stack of those black screw • gears.
> The long screw made the slider assembly move along the axle.
>
> Now, then, what makes the idler gear turn? In line with each of the output
> shaft gears, but not touching them, I located other 16 tooth gears on • another
> axle. This axle turns, driven by the first motor. When it turns all these
> gears turn. But depending on the position of the slider assembly and its • idler
> gear, one of these (and only one) is in line with the idler gear, and that • is
> in line with the output gear, and so you have a single output.
>
> What sensors are needed to moniter this? One rotation sensor on the long • screw
> axle will do nicely.
>
> I've noticed that the gear changing is facilitated by turning the first • motor
> at the same time the second motor is driving the slider assembly. • Otherwise
> sometimes the teeth don't line up and the slider can force things apart,
> because it tries to keep moving. But is the first motor is turning, the • gears
> all mesh reasonably well.
>
> How many outputs can be selected this way? As far as I know, a whole • bunch.
> The longest axles restrict the concept to four or five outputs, but if the
> slider assembly had wheels and rode along a beam, then it could be • extended
> indefinitely.
>
> Have fun!
>
> Dave Paule
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Message has 1 Reply:
 | | More description of Re: Multiple Output Gearbox
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| (...) Thanks! However, there aren't any pictures. I can sketch up something and scan it and email it to you, if you wish. The slider assembly is composed of two four-hole links and three one-hole, two- bump beams. It assembles with short axles and (...) (25 years ago, 14-Feb-00, to lugnet.robotics)
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Message is in Reply To:
| | Multiple Output Gearbox
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| I made a simple gearbox that uses one motor to drive several output shafts, all separately. A second motor selects between the outputs. Only one output at a time can be used, so therefore the outputs aren't fully independent. But for the one which (...) (25 years ago, 13-Feb-00, to lugnet.robotics)
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