Slanted Bumper Ends

[CalTran]

Is the slant absolutely necessary? If that part of the frame is necessary, why not make the slant inside the robot and have the bumpers straight?

[cmrnpizzo14]

Originally Posted by CalTran

Is the slant absolutely necessary? If that part of the frame is necessary, why not make the slant inside the robot and have the bumpers straight?

Yes. We want to drive up to the pyramid corner and straddle it with our robot to help line up our climb. If the bumpers were straight out then they would hit the rungs on the way up (something that we would like to avoid, climbing is difficult enough as it is). with the slanted ends, our robot will "fit" to the corner of the pyramid helping us line up and climb more smoothly.

[Siri]

Is your original post a top view or a side view?

If it's a side view, I believe you are literally asking Q209--part of your bumper (however short) is not 5" tall through its full cross section. This is illegal--the lower edge is longer than the upper edge.

If it's a top view--four front face is shorter than your back face--you would still appear to be in violation of Fig 4-4 as required by A130, but you could ask anyway. People do this for corner joints--it's the lower left image in Fig 4-5, but fig 4-4 would seem to prohibit it when another bumper is not filling the bevel to maintain the cross-section.


That said, we're driving up the corner, and just raising the bumpers got them ore than out of the way. (They only needed to be at like 3" with the position of our climb latches.) If you're trying to use them to line up, you might consider just dropping down simple guides. They could be crazy lightweight on just a servo or a cylinder, depending on how you'd need to actuate them.

[Jon Stratis]

Look at R24, specifically figure 4-4, which combines all points of the rule in a cross-sectional view. My interpretation of that rule says that you need to have the entire cross section for the entire length of the bumper in order for it to be considered a bumper. Cutting the pool noodles at an angle would not meet that required cross section.

When in doubt, ask the Q&A.

[GaryVoshol]

See this Q&A: https://frc-qa.usfirst.org/Question/...ld-a-partial-l