View Single Post
  #24   Spotlight this post!  
Unread 01-04-2003, 17:59
DougHogg DougHogg is offline
Robot-A-Holic
FRC #0980 (The ThunderBots)
Team Role: Coach
 
Join Date: Jan 2002
Rookie Year: 2002
Location: S. California
Posts: 324
DougHogg has much to be proud ofDougHogg has much to be proud ofDougHogg has much to be proud ofDougHogg has much to be proud ofDougHogg has much to be proud ofDougHogg has much to be proud ofDougHogg has much to be proud ofDougHogg has much to be proud of
Re: How we do it.

Quote:
Originally posted by Kojib
Basically, very strong drive-train and dead reckoning. We are 3-WD, with Bosch drill motors locked into highest setting on front wheels with 4:1. Our Rear wheel is powered with both Chiaphuas. They drop into a helical gear set which sends a shaft through the center of the wheel (on bearings) into a planetary set (the sun, more specifically). We then simply bolt the planets to an aluminum hub we fabricated for the wheel, giving us 15.66:1. The entire rear assembly rotates 180' using a globe motor and a cable (it rests on 102 lycra ball bearings). As the rear assembly rotates, we slow down one of the front wheels to keep it from binding through turns. This gives us approx. 12 fps with enough torque to drag me (160 lbs, 5'8") lying down across carpet (also up the mesh and the HDPE, but I don't like repeating those experiments). All three wheels are 8" Skyway pneumatics inflated to approx. 17 psi.
Are you shifting gears to get that kind of speed as well as torque?

I gotta see the two Chiaphuas hooked up to one wheel. Very cool.

See you in Houston.
__________________
FIRST Team 980, The ThunderBots
2002: S. California Rookie All Stars
2004: S. California: Regional Champion,
Championship Event: Galileo 2nd seed,
IRI: Competition Winner, Cal Games: Competition Winner
2005: Arizona: 1st seed
Silicon Valley: Regional Champion (Thanks Teams 254 and 22)
S. California: Regional Runners Up (Thanks Teams 22 and 968)