Alt-BEAM Archive
Message #12868
To: beam@sgiblab.sgi.com mailto:beam@sgiblab.sgi.com
From: Joe [ mailto:doodle@teleport.com mailto:doodle@teleport.com ]
Date: Fri, 31 Mar 2000 17:10:52 -0600
Subject: Fttaba servo as motor/gearbox combo.
Hi,
Maybe this subject is old news? I've been thinking about doing a Chiu style
walker, but have not found similar gear box motors. I now plan to use three
old Futaba servos, as I discovered how to modify them.
If anyone is interested in the process please let me know. I could write up
the conversion and forward it.
The main point is that they are reversable DC motors and not stepper motors.
Perhaps I'm the last one on earth to discover this ;-)
Joe
alone.
class=211541021-31032000>
I
really like it because the walker has more feedback on where its legs are and
can straighten them out itself. You could alter that behavior a little by making
your capacitors smaller and putting an additional resistor between the pot
and ground. That should keep the legs from straightening too
quickly.
class=211541021-31032000>
To
make up for the lower resistance in the pot however, you will have to increase
the size of the capacitor and it will create more current
drain.
class=211541021-31032000>
class=211541021-31032000>Hopefully that helps,
class=211541021-31032000>
class=211541021-31032000>Vincent
class=211541021-31032000>
class=211541021-31032000>
class=211541021-31032000>
class=211541021-31032000> -----Original Message-----
From:
Jeffrey B. Williams [mailto:jeffrey.williams@prodigy.net]
Sent:
Friday, March 31, 2000 17:22
To:
beam@sgiblab.sgi.com
Subject: Re: Fttaba servo as motor/gearbox
combo.
I've been meaning to ask this question, are you
just using the servopots for tuning or are they left connected to the gear
train???
Jeff
style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
----- Original Message -----
Sent: Thursday, March 30, 2000 10:12
PM
Subject: RE: Fttaba servo as
motor/gearbox combo.
class=592480806-31032000>This may also be old news:
class=592480806-31032000>Consider using the pot in the servo (if it has one)
as the resistors in a (micro)core. It will center the legs if they get off
(the capacitors get pretty big though). It worked for
me.
class=592480806-31032000>
class=592480806-31032000>Vincent
Hi,
Maybe this subject is old news? I've been
thinking about doing a Chiu style walker, but have not found similar gear
box motors. I now plan to use three old Futaba servos, as I discovered how
to modify them.
If anyone is interested in the process please let
me know. I could write up the conversion and forward it.
The main point is that they are reversable DC
motors and not stepper motors. Perhaps I'm the last one on earth to
discover this ;-)
face=Courier>Joe
Attachment: mucore_pot.bmp
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