Best motor/gearing option to drive a shooter?

[Bruceb]

Originally Posted by Ether

You posted this identical post in three different threads.

http://www.chiefdelphi.com/forums/sh...46#post1213846

http://www.chiefdelphi.com/forums/sh...56#post1213856

It might be better to post it once and provide a link.

Sorry didn't think about the link idea.
I'll do better next time.
Thanks

[Bruceb]

At full battery voltage and no speed control.
Ya, it's primitive but it works. We will be looking into PID or bang bang later.

[Ether]

Originally Posted by DonRotolo

Sounds like a direct drive to a 6" wheel would be the same.

The larger diameter provides a slightly longer contact path.

[Ether]

Originally Posted by Bruceb

Sorry didn't think about the link idea.
I'll do better next time.
Thanks

It's a great post though. The problem is, it's going to be difficult following the discussion. You've already got responses in two threads.

[Aroki]

We were looking into gearing up our CIM motor to 6000-8000rpm and running an 8in pneumatic wheel. Originally we were looking to gear up a toughbox but after realizing that they only seel 12-14 teeth gears for CIM motors, we'll probably just use belts and sprockets

[Ether]

Originally Posted by Bruceb

At full battery voltage and no speed control

Originally Posted by Aroki

We were looking into gearing up our CIM motor to 6000-8000rpm and running an 8in pneumatic wheel.

FYI, Team 2073 found that above a certain wheel speed, the frisbee exit velocity actually decreased.

http://www.chiefdelphi.com/forums/sh...2&postcount=55

[smclean1969]

Something for the 8000 rpm, that's assuming free spin, which isn't accurate for a motor under load conditions. The CIM has to turn the wheel, so it's going to be something less than 8000. It won't be an amazing drop but 7000 - 7500 is probably more reasonable.

[Ether]

Originally Posted by smclean1969

Something for the 8000 rpm, that's assuming free spin, which isn't accurate for a motor under load conditions. The CIM has to turn the wheel, so it's going to be something less than 8000. It won't be an amazing drop but 7000 - 7500 is probably more reasonable.

Could be a lot less than that if the wheel is generating vibration and windage.

Hint: measure the CIM current with a clamp-on ammeter. Then estimate the CIM speed from the voltage and current, as shown here.

[Aroki]

Originally Posted by Ether

FYI, Team 2073 found that above a certain wheel speed, the frisbee exit velocity actually decreased.

This is definitely interesting, though they're using (from what I can tell)
8" Plaction Wheel from AndyMark while we're using a rubber wheel which may be turned to better fit the frisbee so I guess we'll have to build the belt/sprocket mockup before we can really test what the effective speed is.

[Ether]

Originally Posted by Ether

Who said they are running it at full voltage ?

http://www.chiefdelphi.com/forums/sh...40&postcount=7

[Ether]

Originally Posted by Ether

Could be a lot less than that if the wheel is generating vibration and windage.

Anybody planning to buy 8" pneumatic and run it at 8000 rpm read this thread:

http://www.chiefdelphi.com/forums/sh...d.php?t=111118

[MrRiedemanJACC]

Is there anyone considering using dual banebot 550's to drive their shooter?

[ToddF]

Yes.