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Unread 30-01-2017, 15:13
Munchskull's Avatar
Munchskull Munchskull is offline
CAD Designer/ Electrical Consaltant
AKA: Anthony Cardinali
FRC #0997 (Spartan Robotics)
Team Role: CAD
 
Join Date: Jan 2013
Rookie Year: 2013
Location: Corvallis, OR
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R01 Question: Please save me from welding

While designing our robot I came to some ambiguity in the rules that I would like some opinions on.
Quote:
Originally Posted by STEAMworks game manual R01.
The ROBOT (excluding BUMPERS) must have a FRAME PERIMETER, contained within the
BUMPER ZONE, that is comprised of fixed, non-articulated structural elements of the ROBOT.
Minor protrusions no greater than ¼ in. (~6.3 mm) such as bolt heads, fastener ends, weld
beads, and rivets are not considered part of the FRAME PERIMETER.
Quote:
Originally Posted by R01. Blue Box
To determine the FRAME PERIMETER, wrap a piece of string around
the ROBOT (excluding BUMPERS) at the BUMPER ZONE described in
R23 and pull it taut. The string describes this polygon.

Example: A ROBOT’s chassis is shaped like the letter ‘V’, with a large
gap between chassis elements on the front of the ROBOT. When
wrapping a taut string around this chassis, the string extends across the
gap and the resulting FRAME PERIMETER is a triangle with three sides.

Note: to permit a simplified definition of the FRAME PERIMETER and
encourage a tight, robust connection between the BUMPERS and the
FRAME PERIMETER, minor protrusions such as bolt heads, fastener
ends, rivets, etc. are excluded from the determination of the FRAME
PERIMETER.
Our robots super structure flush with the robots frame perimeter on the front and the back, my method of attaching it was going to be to rivet some gusset plates on the inside and the out side of the drive train. Then issue I is the wording of R01. and its blue box.
Quote:
Originally Posted by STEAMworks game manual R01.
Minor protrusions no greater than ¼ in. (~6.3 mm) such as bolt heads, fastener ends, weld
beads, and rivets are not considered part of the FRAME PERIMETER.
The gussets I would use would be made from .09" 7075 aluminum sheet metal, be riveted in. Knowing how small rivet heads are I can easily say that it would be under .25". I just do not know how to interpret the part that I made bold. The words "such as" leaves room for interpretation that have left me uneasy, I would like to say that flat gussets are fine and as long as the assembly is under a .25" but I fear that it might not be. For this reason I am preparing to TIG weld the outer seams.

Did I interpret this rule correctly or can you set me straight saving my team for my some what less than decent TIG welding?

If you can't save me, any TIG welding tips for 6061-T6511 aluminum would be great! I need them, although learning I was welding backwards made a world of improvement.
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“In theory, theory and practice are the same. In practice, they are not.” ― Anonymous
Anthony Cardinali
4th year of FRC
Class of 2017



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