1:1 gearbox for CIM motors?

[Chris is me]

Originally Posted by EricH

The motors are indeed the CIMs. However, I REALLY question why you want a 1:1 gearbox. I don't know of a single gearbox like that (unless you count the keyed output shaft), but unless you're running them under no load, they might have a heck of a time accelerating to top speed.

A 1:1 gearbox would basically be two gears of the same tooth count. What about that arrangement precludes acceleration at all? There is inherent friction in any drive setup, which is why adding a gearbox to a CIM motor for no reason might not be the best idea, but it wouldn't preclude acceleration. Any flywheel from Aim High that directly drove the wheel would have similar performance to a CIM motor off a 1:1 gearbox.

I would recommend 1 or 2 banebots or FP's geared around 3-5:1.

I agree with the recommendation, but you do realize that the output you're describing is not that much different than the bare output of the CIM, right?

[EricH]

Originally Posted by Chris is me

A 1:1 gearbox would basically be two gears of the same tooth count. What about that arrangement precludes acceleration at all?

CIM torque in relation to speed, if there was a large load (say, in drive). As it's a lighter load, that's less of an issue. I will note that when 330 ran a big CIM for a shooter in '06, we did apply a small-ish reduction, in two stages (one belt, one #25 chain), and had zero problems.

[ratdude747]

I have experience running 6" 2008 KOP wheels direct to a cim. in fact, I was the machinist who lathed up the shaft.

3 wheels, no added weights, using a custom shaft machined from 1/2" hex steel (AL= fail) was able to shoot a 2009 orbit ball into a 2009 trailer 10ft away. however, after a few shots the shooter lost a considerable amount of RPMs, so a flywheel prototype was attempted, which took too long to rev up. In the end, code was written to add a extra bit of power for every successive shot in a certain time window at a given power level.

using such a config this year may not even need such code due to the possession limits...

so can a DD cim shooter work? yes.

[Wildcats1378]

Well, our team is completely new this year and we don't really have any mentors so we're trying to figure it out by ourselfs. We'll try some of what you suggested. Last year, they didn't use 2 motors on the drivetrain, just one. Interesting.

[waialua359]

We are using 1:1 in our final design.

[Colin P]

Originally Posted by Chris is me

I agree with the recommendation, but you do realize that the output you're describing is not that much different than the bare output of the CIM, right?

Most likely to free up a fourth CIM for drivetrain