LEGO TECHNIC : 14645


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Subject:	Re: Help please: I'm trying to get two outputs from one shaft
Newsgroups:	lugnet.technic
Date:	Tue, 27 Sep 2005 21:57:39 GMT
Viewed:	3656 times

In lugnet.technic, David Wegmuller wrote: > In lugnet.technic, Tony Hafner wrote: > > I have one shaft that will be turned by a motor in either direction. And > > I want to get two different outputs, based on which direction the motor is > > turning. > > > > When the Input shaft turns clockwise, Output 1 turns and Output 2 does not. > > When the Input shaft turns counter-clockwise, Output 2 turns and Output 1 > > does not. > > Hi Tony, > Here is something I put together real fast during my lunch break: > http://wegmuller.org/v-web/gallery/OneInTwoOut The movies are quite big > (4MB a piece) but they show clearly how this thing works... Notice that it > works in any position as the mechanism is balanced. This is great stuff, and will probably work for my application. It's mechanically much simpler than a differential with rachets. Thanks!! > An other approach to this is the "traveling worm gear": it relies on the > fact that Lego worm gear slide freely along cross axles. If you're > interested, I'll put one together tonight... I think I can picture how that works: You have a 4-stud-long box with a shaft running lengthwise with a single worm gear. At each end is an output gear. The worm gear slides along the output gears until it hits either end, and then starts turning that output gear? I wouldn't mind seeing an implementation of this, but don't knock yourself out. > Speaking of worm gears: if you need the non-rotating output to be locked > when it is not driven, you can always use a worm gear between this > mechanism and the application point. I may use the worm gear lock on one of the two outputs. The other one should be OK. -- Tony Hafner www.hafhead.com

Message has 2 Replies:

		Re: Help please: I'm trying to get two outputs from one shaft
(...) I will have to dig it out - but somewhere I have a fairly simple LDraw file showing that sliding worm gear device. I also made an interesting variation on this using Lego clutch gears which allowed 2 motors to give 2 outputs each, plus an (...) (19 years ago, 28-Sep-05, to lugnet.technic)

		Re: Help please: I'm trying to get two outputs from one shaft
(...) Followup... this works beautifully. I was a little worried at a few stages of construction when the 1x4 brick sometimes would rotate until it wasn't engaging either gear and then sit there with the 8t gears spinning freely- but in the full (...) (19 years ago, 28-Sep-05, to lugnet.technic)

Message is in Reply To:

		Re: Help please: I'm trying to get two outputs from one shaft
(...) Hi Tony, Here is something I put together real fast during my lunch break: (URL) The movies are quite big (4MB a piece) but they show clearly how this thing works... Notice that it works in any position as the mechanism is balanced. An other (...) (19 years ago, 27-Sep-05, to lugnet.technic)

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