17-01-2006 00:31

Re: pic: 888 Ball Shooter Prototype

Looks cool.
How much range/accuracy do you get out of it?

17-01-2006 00:42

Stephen Kowski

Re: pic: 888 Ball Shooter Prototype

have you tested this yet? and does the current configuration put spin on the ball that either helps or hurts your shot?? cool setup btw....

17-01-2006 01:12

Jeffdewber

Re: pic: 888 Ball Shooter Prototype

Have not seen it work yet have been busy and out of the shop. But it is working and according to everyone it is pretty fast. They will update tommorow.
-Jeffrey Dewberry

17-01-2006 01:23

cleonavicius

Re: pic: 888 Ball Shooter Prototype

First off, thanks.

What you can't see is the mini-bike motor that drives it on the other side.

In its current configuration, it shoots about 30 feet, when elevated to a 30 degree angle.
According to a radar gun, it travels at 24-26 mph, just a bit more than 12 m/s.
Accuracy is decent, the person catching it at 30' usually doesnt have to move to catch it. This should increase with an automatic feed.

I'm not sure if it puts a spin on the ball, its been too much fun just seeing it work, however, im sure i can test it out more tomorrow

17-01-2006 01:43

Rick TYler

Re: pic: 888 Ball Shooter Prototype

Looks cool. Are you using a belt to drive the shaft, or chains, or ??? Thanks!

17-01-2006 02:08

cleonavicius

Re: pic: 888 Ball Shooter Prototype

We tied the shaft directly to the motor.

Its a piece of 5/8" shaft with a 5/16" hole in one end and two set screws pressing on the flattened spot of the CIM's shaft.

17-01-2006 02:19

artdutra04

Re: pic: 888 Ball Shooter Prototype

Always remember, the "it's just a prototype" attitude should never apply to electrical stuff. Sticking the wire leads off the CIM directly into the Anderson terminal of a battery to test your ideas is a baaaaaddddd idea.

At the very least, put a fuse block in line - or - more preferable, put in a Victor. If you plug the Victor into the motor port of a Vex Controller, you can control it very easily for prototyping and without any need for programming. In the picture below, our team was able to successfully control the CIM motor using the Vex controller.

17-01-2006 02:33

Jeffdewber

Re: pic: 888 Ball Shooter Prototype

Don't worry sir. We have been doing this for years with no problems and there our safe guards in place. We have not fryed a motor yet.

17-01-2006 03:00

i_am_Doug

Re: pic: 888 Ball Shooter Prototype

Nicely done. I really like both signs in the back to.

17-01-2006 10:55

Jeffdewber

Re: pic: 888 Ball Shooter Prototype

Yeah the no dumping sign is in our electronics work room. We put that there because people would always dump stuff in there. LoL

17-01-2006 23:06

coldabert

Re: pic: 888 Ball Shooter Prototype

First off, thats not "our" electronics room. That is my personal office that I have been renting out to Team 888. (I'm still looking for a secretary. I'm looking for anyone who can write poems, fill waterbottles, make runs to RoFo, and keep my radios charged)

And we have a test board set up with a dpdt switch, breaker panel, battery connectors, and a battery mount that we use to test our prototypes. I would recommend that all teams with similar materials should build one of these boards as they make testing very easy. I can post the schematic if anyone wants it.

One of the things we found with this design is that it is important to have that metal sheet tangent to the wheel to provide the maximum friction.

20-01-2006 13:23

thesse

Re: pic: 888 Ball Shooter Prototype

20-01-2006 13:38

K.Shaw

Re: pic: 888 Ball Shooter Prototype

doesn't it take the motor a little longer to speed up a wheel that size to max speed? once up to speed does the wheel slow down at all after a ball has been dropped in? are you able to shoot more than one ball a second and have them go the same height distance and land in about the same area? just a few things we ran into in our prototyping stages with a similar set up.

20-01-2006 14:32

Andy B

Re: pic: 888 Ball Shooter Prototype

Very cool prototype.

One Quick Question though,

How did you mount the Large CIM Motot?

Thanks,

22-01-2006 21:32

chrisinmd

Re: pic: 888 Ball Shooter Prototype

We thought the wheel size would take awhile to speed up. (Based on preliminary tests with softball pitching machine), but the large CIM gets to speed fairly quickly.
We took off the belt tension thing and mounted the CIM flat against the plywood.
-Chris

23-01-2006 01:05

Andy B

Re: pic: 888 Ball Shooter Prototype

How did you mount it?
Did you drill and tap more holes?
Did you just use the mount that the tensioner lever was attached to?

25-01-2006 23:13

cleonavicius

Re: pic: 888 Ball Shooter Prototype

We removed the pulley and used the existing stud, as well as drilling and tapping a hole in the corner that sticks out of the face.

26-01-2006 16:51

thesse

Re: pic: 888 Ball Shooter Prototype