Applicatiosn of bicycle disk brakes

[mlantry]

Doing some research looking into using bicycle disk brakes but am unsure of good applications for them as well as how to adapt them. would love to see how teams make them actuate to and from being a brake as well as how them are attached to mechanisms. Thanks (pictures would be appreciated)

[ASD20]

In 2014 we used one. We actuated it using a piston and it was actually attached to a bike hub, like it was designed to, that we used to winch back a puncher.

[ahartnet]

Originally Posted by mlantry

Doing some research looking into using bicycle disk brakes but am unsure of good applications for them as well as how to adapt them. would love to see how teams make them actuate to and from being a brake as well as how them are attached to mechanisms. Thanks (pictures would be appreciated)

2363 at least prototyped with a disk brake last year. Not sure if it ended up in their final design: https://www.youtube.com/watch?v=9QmJ3KatBw4

[nuclearnerd]

Here's how we used a disc brake on our 2015 robot "Guillermo"s elevator. The brake allowed us to hold a stack without having to keep current on the motors, and with a faster gearbox than would otherwise be necessary to prevent backdriving.

Mounting was reasonably easy. We modified an Andymark hub (slotted the holes a bit) to match the rotor hole pattern then slid the rotor over the end of a hex shaft. We made up a plate to mount the caliper. The cylinder (a 3/4" bore, 2" stroke iirc) was mounted on a bracket remotely, connected to the caliper with a bit of brake cable and housing.

I think 1678 (and probably others) used a disc brake on their climber this year. We considered one too, but ultimately just went with a single use latch (since you only climb once in a match.

[Tom Ore]

Our elevator brake from 2015.

[asid61]

We used one last year on our elevator (thanks 2363!) too prevent backdriving. This let us run a 24in/sec elevator with two RS775-18v without overheating issues, although we did lose some gears on the Versaplanetary dual input later in the year.
We also used one this year to hold our angler in place, but there were many issues with it that caused it to be ineffective. It may have just been the brake we used or manufacturing tolerances.

[otherguy]

In 2015 we incorporated a pneumatically actuated bike brake into our robot.
The disc was coupled to the belts that drove the lift. The software was setup to automatically engage the brake when the commands to the motors that drive the lift were below a value that would cause motion (that way we didn't have to explicitly engage and disengage the brake with every command).

The brake and caliper are this one: https://www.amazon.com/gp/aw/d/B003W...IIL&ref=plSrch

Renders from our CAD model here:
http://imgur.com/a/17HN6

It would also be worth checking out 971s robot from the 2014 season: https://picasaweb.google.com/m/zoom?...portHeight=416

[BrendanB]

In 2014 we used a disc brake on our shooter winch. We wanted a fast cycle time between shots, less stress on our dog shifter while firing, and most importantly control over the shooter for safety.

The cable coming from the gearbox was connected to a locking piston mechanism that was larger than it needed to be but it did the job well and was a designed by some freshman students and made primarily on a bandsaw and drill press.

Pictures can be found here.

Video of them in action here.

[Jonny_Jee]

I'm pretty sure 1678's 2015 robot used a disc brake to keep their elevator at a fixed hight.

[ZeroGAdam]

In 2012, my old team, 2180, utilized a disk brake on our rear wheel to aid in balancing on the competition bridge with our robot which was basically a 4x4 . I remember that year, once we showed it off in our first few matches, teams would always come to us to make sure that we would balance with them on the center CO-OP bridge. Ahh, those were the days. I'll see if I can find any pictures because it actually was a stupid simple system which included stock bike parts, some fishing line, and a servo. Only a little force was required for our entire robot to be locked in place.

[Ryan Dognaux]

We used a disc brake in 2015 like many teams to hold the position of our elevator without having to stall the RS775 motors that powered it.

We purchased this kit off Amazon and mounted 1/2" hex versahubs to the rotors. We then used a small pneumatic actuator to pull on the brake cable whenever power wasn't being applied to the elevator. It was incredibly easy to set up and install from a mechanical perspective and we never smoked an elevator motor during our matches.

[DonRotolo]

I'd consider a pneumatic cylinder - not much stroke needed - that is Brake On in an Unpowered state. Many bike brakes use hydraulics, so I'd be wary of that, but bowden-cable type are dandy. Use latex tubing to pull the brake ON, and a cylinder big enough to fight the latex and push it OFF. Release the air and it clamps down.

[Lij2015]

Originally Posted by ahartnet

2363 at least prototyped with a disk brake last year. Not sure if it ended up in their final design: https://www.youtube.com/watch?v=9QmJ3KatBw4

It did make it into the final design! Thanks for the shout.

[AdamHeard]

Anyone know the weight of the brake caliper assemblies posted here?

[Cory]

Originally Posted by AdamHeard

Anyone know the weight of the brake caliper assemblies posted here?

Here ya go, buddy