Subject:
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Re: transmision help... Anyone?
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 21 Sep 2000 23:13:50 GMT
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Viewed:
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3524 times
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In lugnet.technic, Dan Boger writes:
> On Tue, Sep 19, 2000 at 11:14:48PM +0000, geordan ballantree wrote:
> >
> > HI, I don not have either of the superacars and am longing to be able to
> > make a transmission but can't without the spiecal parts given in the 8880
> > and 8448.
> > Does anyone know of a way to make a transmision with out those parts?
>
> yah, look here:
>
> http://www.brickshelf.com/scans/0000/0853/
>
> and especially here:
>
> http://www.brickshelf.com/scans/0000/0853/0853-04.html
In the same manner as on the above model, but using varying
ratios both between input and sliding axle and between sliding axle
and output, it is relatively easy to increase the number of speeds -
though at some point, one will need an axle connector in the
rather long slding axle. I've gotten up to six speeds in
an input/sliding/output setup (also 5+R, with an extra idler gear),
and recently built one with 3 fixed and 2 sliding axles (with
3 and 2 ratios respectively), which results in 6 gears.
Then the 2-ratio axle has a handle as in the pictures above,
the left-right tilt of which is translated into a shifting
of the 3-ratio axle (resulting in a realistically shaped
'H' (3-wide) shift pattern).
A good, easily extended beginning is a rotationally
symmetric setup like this:
(in a monospace font...)
AA AA
===============
333333AA BB
AA 11 @@@@
2222@@@@2222
@@@@ 11 AA
BB AA333333
===============
AA AA
OO
The 3 axles are vertical; == is a technic beam, AA is bare axle,
BB is a bushing, 11 is an 8-gear, 2222 or @@@@ is a 16-gear,
333333 is a 24-gear. The center axle slides; it is shown
in center position (1:1), with a 1-stud length sticking
out top and bottom for sliding (OO marks the first possible spot
where the mounting for the shift handle may begin);
the bits of axle sticking out top left and bottom right
are input and output. The slding axle may be shifted
1 position up or down (for 1:3 and 3:1 respectively).
By toggling any individual axle between using 8/16 gears
and 16/24 gears (and changing the axle distances appropriately),
other gear ratios are easily implemented, e.g.
1:2,1,2:1 and 2:3,1:2,2:9.
Also, longer symmetrical setup could be done using the new
12 and 20 gears (with some restrictions for placement to avoid
gear lock due to their widths).
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