Subject:
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one motor- four diffrent axles
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 26 Oct 2000 21:33:28 GMT
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Highlighted:
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(details)
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I had a great idea. I'm not sure if anyone has done this before, but I
have found a way to make one motor drive four (or more) axles,
individually! The downside is that only one axle can be rotated at a
time and in only one direction, and I'm having some problems with the
construction. First, how it works:
Attached to one end of an axle is a 24 tooth gear. The axle goes through
a beam and then has some flat plate gears attached to the axle in such a
way that when a gear ( I used the big ones) is meshed with the plate and
then the gear turned, the whole axle will move forward, but still rotate
freely (see where I'm getting at? ;). On the end where i put the gear,
there is four seperate 24 thooth gears on 4 axles through the beam that
the first axle goes through, and another beam, four gear lengths further
on. Each gear is arrange in a way that none of the gears touch each
other, but they can all touch the main axle's gear if the gear is slid
into place. By moving the axle up and down, the origanal gear will mesh
with only one of the other gears. Neat huh? Now the more complicated
part. On the far end of the axle 1, there needs to be 4 gears side by
side. This is so that when the axle moves forward, the driving gears
will still be able rotate the axle. Using a differencle gear, turning
the motor one way turns the axle, but turn it the other way and the axle
will move forward or back. This was my origanal plan, until i reliezed
that i had no way of moving the axle backward. After some pondering, i
figured out i could use an off center large gear to rotate the gears
moving the axle forward. On this axle (i'll call it 2) i have the white
gear that will stop spinning if to much force if used. This is so that
when the axle 1 reaches the beam and can't go any farther, it doesn't
stop the off center large gear (Gear 1) from contiuning to rotate. This
is important beacuse once gear 1 is finished moving axle 2 one way, it
contiunes to move and eventualy reaches another gear. This gear is also
connected to axle 2, but in reverse. So, always going the same
direction, gear 1 first rotates axle 2 one way, then rotates it the
other. To make the axle move the desired distant, all you have to to is
firgue out how far to rotate gear 1, a complete rotation moves the axle
2 from one end to the other and back again. I know this sound confusing,
so I aploligize.
--|-- +---| * | *
| +-|----~~~~--|---++++
--|-----+ | |
the pluses are gears, one in middle cental axle, the little squiggles
are the flat gears, the two * are the gears hooked up to the moter that
make the axle rotate or move back and forth.
@ *
() +
++++
Crude drawing, but the two parenthesices are the off center gear, the
pluses gears, the * the white gear. the @ is where the axle connects to
the outer hole of the gear. the * in turn is directly conected to the
first * in drawing 1 by an axle.
I hope this is enough info, and not to confusing. My problem is in
drawing 2, i can't seen to find a gear combination that works well. I
can make the axle move forward easily, but posstion the other gears so
that none of them but one touch the off center one is proving to be
difficult, espesialy since that one must drive the others in reverse.
Jason
P.S. has anyone designed a virtual lego builder that can be used to
design virtual invention and easily post them on the web? All it would
need to be is a picture of each peice from diffrent angles. Or a progam
that lets you rotate the pieces to how you want them, then save your
picture in jpeg format. If done right, it could look like the pictures
in the instruction manuals from lego.
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