View Single Post
  #23   Spotlight this post!  
Unread 30-09-2014, 01:54
AustinSchuh AustinSchuh is offline
Registered User
FRC #0971 (Spartan Robotics) #254 (The Cheesy Poofs)
Team Role: Engineer
 
Join Date: Feb 2005
Rookie Year: 1999
Location: Los Altos, CA
Posts: 802
AustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond reputeAustinSchuh has a reputation beyond repute
Re: Team 971's CAD Archive Release

Quote:
Originally Posted by AdamHeard View Post
Starting in 2011 or so, we'd ream .001 under and just hoped it would work!

We tested torque required to slip and found it exceeded what we need by a good margin. I mean we used a 3-4 ft lever arm w/ some weights.
Awesome, thanks for the data point! I believe we used a 0.0015 press, which just worked for similar reasons. That was some fun math to do. You can treat the hex like a pressure chamber, and figure out the force required to slip it. I remember calculating that we needed 300 lbs of force to press it on.

This year, we left a step at the end of the bore so we could press it on until it hit the end of the CIM shaft. That worked well. You can see it in the model.
Reply With Quote