Rotation Systems

[dtengineering]

We were quite pleased with our turret... it had 300+ degrees of rotation and about 45 degrees of tilt, and worked flawlessly all season.

If only the mechanism that loaded balls into it had done the same. Sigh.

In any case, we used an aluminum lazy susan bearing from Lee Valley Tools

http://www.leevalley.com/wood/page.a...50,43298,43316

The balls were loaded by a belt drive through the centre of the lazy susan.

Jason

Oh... yeah... we used a globe motor (with a 1" dia. pulley on it) to turn the turret using a 1/4" thick 15" dia. o-ring stretched around the outside of the lazy susan.

[UCGL_Guy]

We used a globe motor and #25 chain - we actually "attached" 25 chain around a lazy susan purchased from mcmaster carr to rotate - could have went 360 but we limited it to 180 just to be on the safe side. wires for the shooter CIM motor were tethered. We had no problems with this, our loader was also our demise. Anyway we used the same lazy susan last year for our arm and it worked really well.
Ken

[Andrew Blair]

Our original plan was to have a shooter on a turret, using a lazy-susan bearing from Mcmaster. Well, we got the shooter on the bearing, ran out of time, locked the bearing and eventually ended up just ditching the thing. But, the Mcmaster bearing was rated to a very high weight load, only 30 dollars, light, large ID, very tight for the price, and seemed very tolerant to side thrust. Very similar to the Lee valley bearing, and probably the same one UCGL_Guy's team used. Overall, nothing but good things to say about it, especially with a little weight on it.

[Astronouth7303]

Last year, we used an aluminium wheel hub for our arm. (I thought it was a great idea this year, too.)

This year, it was a turntable similar to what you would find at Home Depot for swing-out tables. (about 6"~8" diameter)