View Single Post
  #4   Spotlight this post!  
Unread 01-02-2013, 23:49
JohnSchneider's Avatar
JohnSchneider JohnSchneider is online now
Registered User
FRC #3310 (Black Hawk Robotics)
Team Role: Mentor
 
Join Date: Mar 2010
Rookie Year: 2010
Location: Dallas
Posts: 778
JohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond reputeJohnSchneider has a reputation beyond repute
Re: NEW DRIVE TRAIN with Vex Pro Gear Boxes

Quote:
Originally Posted by Kevin Sevcik View Post
Actually, I'm not certain they think being geared for 24 ft/s is a problem. I suspect it will become more apparent as they add weight to the robot. Luckily, low gear will put them right around 10-11 where things are a little saner.
We didnt even notice it with weight.

We didn't have carpet to practice on at home so even on pneumatic wheels we were turning on linoleum. Carpet DESTROYS dreams.

To the team in question:

A CIM spins at 5280RPM, 88 revolutions per second. If you are direct driving with your gearbox and 4 inch wheels, you are driving at about 23 feet per second. Much too fast. anywhere between 13-17 is considered "normal" in FIRST (high speed).

Last year we did the same thing on accident, and once you throw 100+ pounds on top and try to turn on carpet it becomes a HUGE issue going 23fps. We had to cobble together this ridiculous setup. Instead while you have time, I would suggest building some offsets for your gearbox, and either put another gear reduction stage in there, or use sprocket reduction.