Currently we are looking into better ways to remove our bumpers more quickly. We are looking into different materials and came across couch clips. Would couch clips be legal to hold the wood of the bumpers to the chassis. If not what other quick release systems would you all suggest we use for the bumpers.
If the end result satisfies “hard BUMPER parts allowed per R30-A, R30-E, R30-F, and R30-G must not extend more than 1 in.”, “must attach to the FRAME PERIMETER of the ROBOT with a rigid fastening system to form a tight, robust connection to the main structure/frame”, and the rest of R30 you’re probably legal.
Emphasis on “tight” and “robust”.
You do NOT want to lose your bumpers during this game.
For quick release bumpers, you may try something like a Push-to-release hitch pin. Use this link for reference.
Possibly cheaper than McMaster, you can find a bunch of quick release pins on Amazon as well. They’re often used on the machines in weight rooms, and are available in bulk. If it can hold 200 lbs in a leg press machine, it can work for your robot!
perhaps you should look into reversible bumpers
BOOOO - No reversible bumpers
Those are an easy way to get a Red Card in a match with aggressive defense happening
After lots of bumper issues in 2016, we tried out the slide-snap draw latches from McMaster in 2017 following some advice we found here on CD. They were an amazingly simple system that held up to some heavy defense. Bumper changes were so simple and fast. We plan to use this system again.
If that happens you made them wrong… I am so excited to get back to the sweet world of reversible bumpers with bungees after last year.
while not “full” reversible bumpers 4513 has used Velcro for one “set” of bumpers just fine since 2014. Never had an issue.
The way our team does our bumpers is a slide in place then secure system. At the bottom of our bumpers are two or three bolts depending on the size of the bumper. On the top plate of the bumper are holes. The bolts slide up into an upside down ‘U’ in the mounting plate, then bolted on the top to prevent movement. This could be reversed and have the bolts on the bottom if you wanted.
That’s a nice looking solution. As a rookie team we have been trying to decide the best way to tackle bumpers. Do you have any pictures showing how you used this last year?
Thanks for sharing!
Last year, after seeing this video, 2386 went straight to work making them. Although our bumpers took upwards of 5min to take on and off (poor mount design), we could switch between red and blue in under 30 seconds. I would imagine they’ll be continuing with this style reversible bumper, as they were so easy to use at competition.
When I was on Buzz Robotics we had studs attached to the bumper sections. The studs would go through holes in the frame and then were fastened with wingnuts.
You still have to remove the bumpers for inspection.
Yes but that means taking them off only a few times per event rather than as much as every single match (depending on your schedule). By moving to reversible bumpers, we were able to make a much more robust set of bumper mounts that were indeed harder to remove (and would have been a nightmare if we had to do it every match). But we only ever had to remove them twice a competition. Once when we unbagged, and once going into Elims. Every other time we switched colours, it was a sub 30 second job per side.
I’ve made reversible bumper covers last year for Steamworks. We played with fairly aggressive offence and defense and scraping along the side of the field and other robots to get past them, and all that happened was that the numbers on the side got a bit messed up. They were only held in with velcro and they were probably the best bumper covers our team have had so far. They held up through worlds.
here in the picture you can see the crease in the middle where they folded.
Another solution we have used with decent success is posts (basically a fixed clevis pin) on the BUMPERS, that slide through holes in frame mounted tabs, secured by hitch (reusable cotter) pins. Much faster to install/remove than with nuts (of any style) and cannot vibrate loose. Prior to cotter pins, we used to use nuts to secure.
We(team 3303) are in our 4th year with reversible bumpers and have never had a problem with playing aggressive defense. The key is to make them well and use good velcro.
343 uses a C channel that will fit snugly around 1 inch tube, we typically attach the C channel to the robot and a small bit of 8020 to the bumper that is aligned with the C, we then drill appropriately positioned holes through the 8020 and C and push in ball lock pins, these have held for us very well since 2013. We did reverse positions of the C and 1in square in 2016 because the frame of our robot that year lent itself to such.