Top/bottom roller shooter vs. bottom roller only

[JamesCH95]

Originally Posted by DonRotolo

With one driven wheel at 1500 RPM, you get the same exit velocity as with two driven wheels at 750 RPM. So I am leaning towards the two driven wheel solution.

I am thinking that two FP motors driving one wheel is the same energy into the ball as one FP driving each wheel. Yes, you should manage your spin as well.

So if there's a vote, I pick the 2 roller shooter.

I vote for two-roller (NOT two-wheel) option as well for the reasons Don highlighted.

I think that rollers are more tolerant to ball variances than wheels are because they're wider (either in feed, density, compressibility, etc). Our two-roller shooter this year (and in 2006) was VERY consistent, to within less than a ball radius over 20-30ish shots in our short-range prototype being fed by hand (i.e. inconsistent feed) with 6 different balls.

My $0.02