I am making a double reverse 4 bar lift for this years game and i would like to know a few tips on how to stabilize the arm better, and any other tips you guys have.
Cross-brace like crazy! But not too much.
Really make sure the gears are aligned correctly even though it’s a pain in the booty.
Add rubber bands to make the lift faster.
Watch some of this for more help.
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There isn’t much use for a dr4b this year, but if you’re set on it then remember to cross brace wherever you can. I’d also suggest that you power the lift from the second stage
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thank you, I saw your videos on dr4b lifts and they were really informative, I subscribed
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Oh 
I am not Kepler Electronics. But if you wanna check out my channel.
yeah i saw your video before i made this post when i was brainstorming/researching.
Nice! I am planning on making a whole new bot when my chain comes in. My goal is to make it just a little bit more sturdy.
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where is your team from?
One good tip I’d like to offer is to build your lift with the motors mounted at the bottom (powering the bottom 4-bar as if it was standalone). Then, you can gear the bottom 4-bar directly to the top one so that they lift together. This will make the lift lighter and faster because you don’t have to lift the weight of the motors like you would if you mounted them in the middle of the lift. You can also make the middle segment lighter and stronger because you won’t have to build to support the motors.
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You can still gear them together if the motors are in the middle. Just connect the gear ratio to the gears that connect the 4 bars (a lot of teams in ITZ did it this way) I would actually suggest this method instead of putting the motors on the towers because it eliminates some slop.
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From personal experience in Vex IQ, double up all of your gears and make the spacing really tight. Ideally, no part of the axle should be visible. Another way to reduce swaying is to make towers wider so it contacts the axle at two separate points to give it more stability. Last thing, be careful with the plastic lock bars. When I was building a DR4B, I used multiple on each axle and still had to replace them way too often when they got stripped. Having plenty of both the square and bar lock bars will be helpful.
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Thanks this made the lift work
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If you’re considering Dr4b for this game, you should reconsider. It is much better to do a lift like in 81k’s recent showcase (a 4 bar), if you’re doing a lift at all.
This is for IQ where a DR4B might be useful.
Ah, I see. My bad, that could indeed be useful. Better than a 6 bar with its massive arc.
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