23-12-2014, 17:49
|
 |
no bag, vex only, final destination
AKA: Pinecone
 FRC #0228 (GUS Robotics); FRC #2170 (Titanium Tomahawks) Team Role: Mentor
|
|
Join Date: Dec 2008
Rookie Year: 2006
Location: Glastonbury, CT
Posts: 7,755
|
|
|
Re: Best Practices for Not Crushing Thin-Wall Tubing
Quote:
Originally Posted by JamesCH95
Why did you feel that this was necessary?
Some quick bearing load calculations assuming 1/32in wall, 3/8dia dead axle, and passing it through two tubes (thus 4 walls), and a 35ksi yield strength: 1/32in x 3/8in x 4 x 35,000psi YS = 1640lbf of bearing strength through just the walls of the tubes.
|
I would definitely be concerned about creep more than pure yielding. We had all kinds of creep failures when we mounted screws directly to VersaTubing last year without gussets or other material support.
That said, might be easier to just make a gusset plate and slap it on the outside?
__________________
Mentor / Drive Coach: 228 (2016-?)
--2016 Waterbury SFs (with 3314, 3719), RIDE #2 Seed / Winners (with 1058, 6153), Carver QFs (with 503, 359, 4607)
Mentor / Consultant Person: 2170 (2017-?)
.
College Mentor: 2791 (2010-2015)
-- 2015 TVR Motorola Quality, FLR GM Industrial Design -- 2014 FLR Motorola Quality / SFs (with 341, 4930)
-- 2013 BAE Motorola Quality, WPI Regional #1 Seed / Delphi Excellence in Engineering / Finalists (with 20, 3182)
-- 2012 BAE Imagery / Finalists (with 1519, 885), CT Xerox Creativity / SFs (with 2168, 118)
Student: 1714 (2009) - 2009 MN 10K Lakes Regional Winners (with 2826, 2470)
2791 Build Season Photo Gallery - Look here for mechanism photos My Robotics Blog (Updated April 11 2014)
|