Motor driven catapult gear ratio
 

For those with motor driven catapults, what are your setups?

Re: Motor driven catapult gear ratio
 

2 BAG motors at 466:1.

Edit: That's pulling the catapult down -- we are not using the motors to throw the ball. It's unclear what you're after here.

Re: Motor driven catapult gear ratio
 

I think he's referring to Boom Done type shooters...like Spectrum's and our robot.


To OP, 15.33:1 for our shooter

Re: Motor driven catapult gear ratio
 

Yes we are looking to change our catapult firing mechanism from springs to motor driven.

Re: Motor driven catapult gear ratio
 

Why?

Re: Motor driven catapult gear ratio
 

Our springs were inconsistent and wore down after like 50 shots. Also we couldn't move the catapult arm without releasing it completely. Motors would be more consistent and reliable.

Re: Motor driven catapult gear ratio
 

What factors do you think might make the motor performance change during the course of a match.

What does the above sentence mean?

He means that the catapult arm can only be stopped halfway through its motion path with a great deal of effort in a fairly unsafe manner. We had the same problem in 2008 with a spring driven catapult. Also, dry firing was extremely risky, for us.

Re: Motor driven catapult gear ratio
 

We have a 2 cim toughbox mini (i dont remember the ratio) with a belt driven 3:1 if i remember correctly from there. We have power and speed to spare.

Re: Motor driven catapult gear ratio
 

We use a motor driven catapult with a toughbox+2CIMs+35 chain and sprockets.

Total reduction with gearbox and chains is about 25:1.

We also use a pneumatic cylinder on the back with ~8" lever arm that applies 40 lbs of pressure or so.

It can score with just the motors but the range is limited to a small window around 8' out, withe the pneumatics it is significantly stronger.

Re: Motor driven catapult gear ratio
 

we have been having trouble with consistency with our motor shooter specifically when the battery gets low

Re: Motor driven catapult gear ratio
 

6 cims, 12.75:1 gear reduction (3 cim toughboxes) and a 2:1 chain reduction totaling 25.5. We can pour the ball off the front, shoot from 18ft, full court or anywhere between.

Here is our reveal video wich showcases our close end adjustability: http://m.youtube.com/watch?v=qPc_Vi_9Pww

Re: Motor driven catapult gear ratio
 

What is your catapult arm made of?

Re: Motor driven catapult gear ratio
 

Our arm is basically 1/8 x 2" aluminum riveted to 3/4" angle aluminum for support. It is a flattened "J" curve in shape. The center of the ball is ~17" from the fulcrum.

Re: Motor driven catapult gear ratio
 

Do you have any pictures of your entire setup?