Newsgroups: comp.robotics
Path: brunix!sgiblab!sdd.hp.com!saimiri.primate.wisc.edu!relay!jsgraha
From: jsgraha@relay.nswc.navy.mil (Jeff Graham)
Subject: Re: SUMO COMPETITIOR #8
Message-ID: <1994Apr21.112118.12104@relay.nswc.navy.mil>
Sender: news@relay.nswc.navy.mil
Organization: Naval Surface Warfare Center
Date: Thu, 21 Apr 1994 11:21:18 GMT
Lines: 48

In article <XZ04kc2w165w@sfrsa.com> bsmall@sfrsa.com (bsmall) writes:
>Well, I've got a week and a half and my Sumo bot
>still needs major work.  It was very difficult
>just attaching the wheels to the motors.  My first
>set of motors did not have enough umpf to win a contest
>let alone push around 3 kilograms.
> 
>Another difficulty is the 20cm footprint. I wasn't able
>to find motors short enough to put them end to end and
>be within that dimension.  I was considering building
>a transmission and offsetting the motors, but that takes 
>time that I haven't got.  My goal of 4 wheel drive seems
>very distant now. But consider this top view arrangement:

Brad, why not add a belt (or chain) to a gear on the undriven
shaft so that all four wheels are powered?

 
    WWWWW                      WWWWWW
    W   WG  MMMMMMMMMMMMMMMM  GW    W
    W   WG  M              MSSGW    W
    W   WG  M              MSSGW    W
    W   WG  MMMMMMMMMMMMMMMM  GW    W
    WWWWWB                    BWWWWWW 
	 B                    B 
    WWWWWB                    BWWWWWW
    W   WG  MMMMMMMMMMMMMMMM  GW    W
    W   WGSSM              M  GW    W
    W   WGSSM              M  GW    W
    W   WG  MMMMMMMMMMMMMMMM  GW    W
    WWWWW                      WWWWWW
 
>where W is for Wheel, M is for Motor, and S is for Shaft.
G = gear
B = belt

>The idea is that two corners are power driven, the other
>two are undriven and are also a little off the ground so
>that all the weight is on the two driven wheels, thus max-
>imising the friction.
> 
>Brad Smallridge
>bsmall@sfrsa.com
-- 
-Born on the Bayou-
Wish I was back on the bayou.  Rollin' with some cajun queen.
Wishin' I was a fast freight train just a jueglin' on down to New Orleans.
Born on the bayou.  Born on the bayou, Lord.  Born on the bayou.  Do it  do it.
