Alt-BEAM Archive
Message #06684
To: beam@sgiblab.sgi.com
From: "Mike Kulesza" mikekulesza@hotmail.com
Date: Tue, 12 Oct 1999 23:38:56 GMT
Subject: [alt-beam] Re: What do I Need? - J Wilson's Gearmotors
I was one of the people that bought james Wilson's $5 gear motors. I screwed
in and epoxied a long screw to the center of the output gear, and had the
legs attached about 5 - 8 cm form the gear on a thingy that you put in a
wall, it flips open, and you cant pull it back out. (I forgot the name, but
its two halfpipes, attached by a spring, that causes it to open and close).
The legs were pressed tightly against a screw to this device. However, this
walker is now scrapped, since the motors were quite weak, were to fast, and
a quite heavy. I measured about 75 rpm @ 5V. The walker could not even lift
its legs. I image that the source of these motors was from some sort of
recorder...
Oh well, this time i used hand made gear motors, made of plexiglass, and
smaller motors. They have very high torque, and are quite effective. As for
James Wilson's gear motors, they will probably be incorporqated into a
head...
>From: "James Wilson"
>Reply-To: beam@sgiblab.sgi.com
>To:
>Subject: Re: What do I need?
>Date: Tue, 12 Oct 1999 18:55:30 -0400
>
>A while back I came accross some very efficient gear motors and sold some
>of
>them over the list at 5$ cdn each I thought that it was a great deal. Many
>of you complained b/c they did not have an out put shaft, so much for
>ingenuity!. I have recently had some time to get back into beam and built
>a
>walker out of them, my mechanics need a little work but one thing to
>remember is that not a single walker design calls for 360ø of rotation for
>a
>leg or leg pair. The largest one could possibly utilize is a swing of 90ø.
>But that too is impractical. The optimum is, imho, between 30ø and 60ø,
>which my motors will easily accomodate. They turn nearly 180ø with my
>current setup, I drilled a hole in the out put gear and screwed the leggs
>to
>it. These have built in mechanical stops and heaps and heaps of torque.
>The most recent mucking about I have done is with Chiu's Two Motor Walker
>and I used 5M resistors in my microcore instead of 1.5M and an LS driver.
>The walker woked really well, almost to much power! But like I said my
>mechanics need some work cause the darn thing gets it leggs stuck and then
>just flips it self over and goes into saturation but as with all beam stuff
>I will tweak and triumph. Last night I tried them with the beam ant
>circuit
>using an acx for a driver works great! So for those out there that are
>willing to tweak I can get more motors the price is the same just let me
>know!
>
>James :-))
>----- Original Message -----
>From: Senior
>To:
>Sent: Monday, October 11, 1999 10:59 PM
>Subject: Re: What do I need?
>
>
> > Well, you'll have to do a bit of studying and decision making.
> > Some comments:
> > 1 - It's hard to get 2 motor walkers to do much, like turning, but
> > reversing is no problem, and you could most likely tweak it to get it to
> > turn.
> > 2 - It aint gonna be cheap. Motors that walkers use are extremely hard
> > to come by and especially when their cheap. You could use servos, which
> > are 10 bux a peice, but that right there is 20 dollars, which is out of
> > my budget.
> >
> > Uh... that's about it.
> > You could use the traditional walker from:
> > http://www.golden.net/~amiller/
> >
> > Or the bicore walker thing from Ian's site:
> > http://www.beam-online.com
(it's in there somewhere...)
> >
> > And check out the FAQ:
> > http://people.ne.mediaone.net/bushbo/beam/FAQ.html
> >
> > After reading each of those sites carefully, you will know how to build
> > a walker! Ta da!
> >
> > Happy Beaming,
> > Kyle
> >
> > Chris wrote:
> > >
> > > Ok, Here's my deal. Since I'm only 15 and do not have a job I want to
>get the most bang for my buck. I need to know what I need to make a 2
>motor
>walker with 4 touch sensors, 2 photodiode eyes, that can go backwards,
>right, left, forward, is nocturnal. By nocturnal I mean uses a solar cell
>in daytime to charge its batteries when it bicore is off, then at night it
>turns itself on. So I need to know what I need because I don't want to
>have
>to pay shipping and handling twice (or more). And I need a site that tells
>me how to hook these things up.
> > >
> > > I'm new to all of this BEAM stuff, but I pick things up fairly easily.
> > >
> > > Win a LAPTOP Computer and get your FREE E-mail Account at
>http://mail.chek.com
>
______________________________________________________
6685 Tue, 12 Oct 1999 18:46:47 -0500 [alt-beam] Re: What do I need? beam@sgiblab.sgi.com Richard Piotter What is the current draw for the motors (no load and stalled, and with a
reasonable near stall load)
James Wilson wrote:
>=20
> A while back I came accross some very efficient gear motors and sold so=
me of
> them over the list at 5$ cdn each I thought that it was a great deal. =
Many
> of you complained b/c they did not have an out put shaft, so much for
> ingenuity!. I have recently had some time to get back into beam and bu=
ilt a
> walker out of them, my mechanics need a little work but one thing to
> remember is that not a single walker design calls for 360=B0 of rotatio=
n for a
> leg or leg pair. The largest one could possibly utilize is a swing of =
90=B0.
> But that too is impractical. The optimum is, imho, between 30=B0 and 6=
0=B0,
> which my motors will easily accomodate. They turn nearly 180=B0 with m=
y
> current setup, I drilled a hole in the out put gear and screwed the leg=
gs to
> it. These have built in mechanical stops and heaps and heaps of torque.
> The most recent mucking about I have done is with Chiu's Two Motor Walk=
er
> and I used 5M resistors in my microcore instead of 1.5M and an LS drive=
r.
> The walker woked really well, almost to much power! But like I said my
> mechanics need some work cause the darn thing gets it leggs stuck and t=
hen
> just flips it self over and goes into saturation but as with all beam s=
tuff
> I will tweak and triumph. Last night I tried them with the beam ant ci=
rcuit
> using an acx for a driver works great! So for those out there that are
> willing to tweak I can get more motors the price is the same just let m=
e
> know!
>=20
> James :-))
> ----- Original Message -----
> From: Senior
> To:
> Sent: Monday, October 11, 1999 10:59 PM
> Subject: Re: What do I need?
>=20
> > Well, you'll have to do a bit of studying and decision making.
> > Some comments:
> > 1 - It's hard to get 2 motor walkers to do much, like turning, but
> > reversing is no problem, and you could most likely tweak it to get it=
to
> > turn.
> > 2 - It aint gonna be cheap. Motors that walkers use are extremely har=
d
> > to come by and especially when their cheap. You could use servos, whi=
ch
> > are 10 bux a peice, but that right there is 20 dollars, which is out =
of
> > my budget.
> >
> > Uh... that's about it.
> > You could use the traditional walker from:
> > http://www.golden.net/~amiller/
> >
> > Or the bicore walker thing from Ian's site:
> > http://www.beam-online.com
(it's in there somewhere...)
> >
> > And check out the FAQ:
> > http://people.ne.mediaone.net/bushbo/beam/FAQ.html
> >
> > After reading each of those sites carefully, you will know how to bui=
ld
> > a walker! Ta da!
> >
> > Happy Beaming,
> > Kyle
> >
> > Chris wrote:
> > >
> > > Ok, Here's my deal. Since I'm only 15 and do not have a job I want=
to
> get the most bang for my buck. I need to know what I need to make a 2 =
motor
> walker with 4 touch sensors, 2 photodiode eyes, that can go backwards,
> right, left, forward, is nocturnal. By nocturnal I mean uses a solar c=
ell
> in daytime to charge its batteries when it bicore is off, then at night=
it
> turns itself on. So I need to know what I need because I don't want to=
have
> to pay shipping and handling twice (or more). And I need a site that t=
ells
> me how to hook these things up.
> > >
> > > I'm new to all of this BEAM stuff, but I pick things up fairly easi=
ly.
> > >
> > > Win a LAPTOP Computer and get your FREE E-mail Account at
> http://mail.chek.com
--=20
Richard Piotter
richfile@rconnect.com
The Richfiles Robotics & TI web page:
http://richfiles.calc.org
For the BEAM Robotics list:
BEAM Robotics Tek FAQ
http://people.ne.mediaone.net/bushbo/beam/FAQ.html
6686 Tuesday, October 12, 1999 4:28 PM [alt-beam] robotic laws alt-beam@egroups.com Michael Hirtle
>hi, i was woundering what the laws of robitics was, i have heard them
>befor but have forgot them. wilf?
>
>
>
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