View Single Post
  #15   Spotlight this post!  
Unread 28-11-2006, 21:36
groves groves is offline
Steve Liggett
None #1213 (Groves)
Team Role: Teacher
 
Join Date: Nov 2002
Rookie Year: 2003
Location: birmingham groves highschool
Posts: 80
groves is just really nicegroves is just really nicegroves is just really nicegroves is just really nicegroves is just really nice
Re: DeWalt Transmission questions

Quote:
What size wheels are you using? Do you have any other gearing? What speed does this make the robot go?
Team 1213 has used 4 inch wheels directly driven during the regular season the last two years (giving us about 8 fps using the lowest gearing) This off-season we used 5 inch (11 fps). This season we are working on a 13 fps system using a 6 inch wheel. One of the best places for robot parts is NPC and we get out wheels from them (1/2 inch keyed hubs). This is where we get other things like the dewalt trannies.

We use only the dewalt transmission to gear our cims down. The output theoretically is 555 rpm's. Here are some pictures of our drivetrain all assembled and in parts.

Quote:
Team 1213 used some pretty small wheels, 4", which gave them about 5-6' per second in low gear. I'm not sure that they actually shifted the DeWalts. If they did, they'd have a theoretical top speed in the 24fps range. Anyone care to comment on this, or did I just make up a rumor?
We have shifted gears, however we never decided to use it during game play.



What would be the reason for using the dewalt output shaft? We have used 1/2 inch steel shaft modified to match the octagon shaped output on the transmission. Now we are testing a new star disk that replaces the octagon shaped disk on the transmission. Our new disk matches the 1/2 inch steel shaft the key is included in our star disk. (the reason for this "star disk" is that we sheered the end of the modified shaft once in two years. that is the only failure we have had yet) Jack Jones our teams engineer is the designer of this drive system. I'm sure he would be glad to share more information if you would like to hear more (he is very helpful).

.