Alt-BEAM Archive
Message #03727
To: Jakub Pietracha whraven@free.com.pl
From: Les Davis upnrunin@home.com
Date: Tue, 25 May 1999 10:36:37 -0700
Subject: [alt-beam] Re: BEAM survivability!!!
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Put a big lock on your bedroom door!!!!!! Jeez I though my cat was bad.
Les
Jakub Pietracha wrote:
> Hi list you jsut whant bilive what my mom just did. In the morning i
> want to the school and left my walker standing proud on my desk but
> whan i got buck it whas gon. I realized that all of my stuf that I
> left laying on the desk whas gon (multimeter, soldering iron,
> electronic components, motors, ...). I went to my moms roon and asked
> her what hapened and she said that my walker went for a walk. I
> desperatly started to search around the flat and gues where i foun it.
> My mom just threwed it to the trasch container (its a pipe with a dors
> that leeds to a container in the bacement and i live on the 4'th
> flor). I went there and diged threw piles of junk but i found it. The
> walker is alive but it realy stinks (it lended in some roten food)
> loks like I'll have to rename it a Skunk Bot. Talk abourt
> survivabilyti! Has any of you had xperiences like that? Jakub
> Pietrachawhraven@free.com.pl
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Put a big lock on your bedroom door!!!!!! Jeez I though my cat was
bad.
Les
Jakub Pietracha wrote:
Hi list
you jsut whant bilive what my mom just did. In
the morning i want to the school and left my walker standing proud on my
desk but whan i got buck it whas gon. I realized that all of my stuf that
I left laying on the desk whas gon (multimeter, soldering iron, electronic
components, motors, ...). I went to my moms roon and asked her what hapened
and she said that my walker went for a walk. I desperatly started to search
around the flat and gues where i foun it. My mom just threwed it to the
trasch container (its a pipe with a dors that leeds to a container in the
bacement and i live on the 4'th flor). I went there and diged threw piles
of junk but i found it. The walker is alive but it realy stinks (it lended
in some roten food) loks like I'll have to rename it a Skunk Bot. Talk
abourt survivabilyti! Has any of you had xperiences like that?
Jakub Pietrachawhraven@free.com.pl
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3728 Tue, 25 May 1999 17:18:00 -0700 [alt-beam] Re: gear motors "'Chiu-Yuan Fang'" Wilf Rigter
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Ah yes! Those Omron ejector motors have a cam on the output shaft which
opens a switch at the end of about 320 degree rotation in either direction.
Once the motor is turning, the switch acts like a "seal-in" contact in
parallel with the external "pickup" input.
Attached is a BiCore with a special OMRON motor driver circuit which uses
this cam switch to limit maximum rotation of the output shaft. The max
rotation of 320 degree is too great for direct drive of the legs but can be
use with a linkage or output gear. Alternately, the cam can be modified to
make the rotation suitable for direct drive of the legs.The circuit is
designed to also allow less than maximum rotation when the BiCore changes
state as would be required for turning etc. The timing can and must be
adjusted to suit the application. The same OMRON driver circuit can be
easily adapted for use with MicroCore signals. A bridge version of this
circuit could also easily be designed.
As can been seen on the schematic, every reversal of the BiCore causes a
AC125 gate output pulse to initiate the motor rotation. As soon as the motor
turns a few degrees the cam closes the switch and connects the AC240 driver
output in series with the switch. The AC125 pulse will terminate (go
tristate) before the 240 output changes and the motor continues to rotate
until the bicore changes state or until the cam opens the switch. Then the
process reverses.
enjoy
wilf
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411
<>
> -----Original Message-----
> From: Chiu-Yuan Fang [SMTP:chiumanfu@home.com]
> Sent: Monday, May 24, 1999 6:24 PM
> To: BotDoc
> Cc: beam@corp.sgi.com
> Subject: Re: gear motors
>
> The "pulse mode" feature on this motor seems very interesting. They will
> turn
> one revolution whenever the controller is pulsed.
>
> Chiu
>
> BotDoc wrote:
> >
> > All Electronics seems to have some interesting looking
> > gear motors for $7.50.
> > http://www.allcorp.com/aecat.html
> > _____________________________________________________________
> > Do You Yahoo!?
> > Free instant messaging and more at http://messenger.yahoo.com
>
> --
> Chiu-Yuan Fang
> chiumanfu@home.com
> ICQ=5614919
> http://www.geocities.com/SouthBeach/6897/beam2.html
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