3 Wheel 3 CIM shooter

[LeelandS]

Wow! That's very impressive. What size and kind of wheels are you guys using, and are they directly mounted to the wheels? Those motors looks pretty closely spaced together.

[Akash Rastogi]

Conveniently not mentioned: This is being run off 1 battery per CIM.

Hopefully the team will figure out a more realistic way of making their goal of a full field shot happening this week and finalize things. Crunch time doesn't leave room for too much iteration.

-Akash

[Garrett.d.w]

If you still want four CIMs on your drivetrain you could put a 775 as one of your stages. You can gear it down to match the CIM's rpm using a CIMulator gearbox.

This is really cool by the way

[nathannfm]

Originally Posted by Garrett.d.w

If you still want four CIMs on your drivetrain you could put a 775 as one of your stages. You can gear it down to match the CIM's rpm using a CIMulator gearbox.

This is really cool by the way

Thanks!

As previously stated only one of those is a full sized CIM so our drive is fine (unless we have power draw problems, but I don't think we will be driving and shooting at the same time)
(the Mini CIM is my favorite thing about VEX Pro)
We did get a CIMulator and 2 550s with our BaneBot voucher, should come in handy even if not this year.

We are somewhat happy that we can get away with not using gearboxes and just go with something like this http://www.andymark.com/product-p/am-0588.htm

[dtengineering]

Even though you are using CIMs and mini-CIMs to shoot, I suspect their current draw is very low relative to your drivetrain.

I agree that you likely won't be driving and shooting at the same time, but I wouldn't about massive current draw being a problem, even if you were doing both.

Jason

[daniel_dsouza]

Darn, 3 motors in a mechanism and no Frisbee shards.

Anyone built anything where you put in frisbees and (unintentionally) shoot out shards?

[nathannfm]

Originally Posted by daniel_dsouza

Anyone built anything where you put in frisbees and (unintentionally) shoot out shards?

As fun as that sounds I don't think you will be finding any of that...
http://www.chiefdelphi.com/forums/sh...5&postcount=39

[Akash Rastogi]

Originally Posted by daniel_dsouza

Darn, 3 motors in a mechanism and no Frisbee shards.

Anyone built anything where you put in frisbees and (unintentionally) shoot out shards?

Breaking frisbees is probably mostly from wheels that don't conform to the contours of the frisbee or there is too much compression. I think the setups our students made are pretty safe as the wheels are relatively squishy.

Either way, we'll cross our fingers and hope no students "shoot their eye out."

[ENeyman]

Originally Posted by LeelandS

Wow! That's very impressive. What size and kind of wheels are you guys using, and are they directly mounted to the wheels? Those motors looks pretty closely spaced together.

The wheels are 4 7/8 in. Banebots wheels. The first one is driven directly by a CIM and the next two are directly driven off of mini-CIMs.

[ENeyman]

Here is a video from today of all three motors being run off of one battery. While the distance isn't quite as impressive as yesterday's, we are still quite pleased.

http://www.youtube.com/watch?v=xcHiwdZuMKM

[Jeffy]

Originally Posted by ENeyman

Here is a video from today of all three motors being run off of one battery. While the distance isn't quite as impressive as yesterday's, we are still quite pleased.

http://www.youtube.com/watch?v=xcHiwdZuMKM

In this video, you will notice the Frisbee flies out of the shooter at an angle. I have seen this happening in videos, but it wasn't noticeable in our prototype. While it may not be an issue for most, it can make scoring a bit tougher.

When you find a way to solve the issue (which I think you will), I'm sure I wouldn't be the only one eagerly awaiting to know what causes the "off angle" exits of Frisbee. Much appreciated if you don't mind.

[ENeyman]

Originally Posted by Jeffy

In this video, you will notice the Frisbee flies out of the shooter at an angle. I have seen this happening in videos, but it wasn't noticeable in our prototype. While it may not be an issue for most, it can make scoring a bit tougher.

When you find a way to solve the issue (which I think you will), I'm sure I wouldn't be the only one eagerly awaiting to know what causes the "off angle" exits of Frisbee. Much appreciated if you don't mind.

I believe the spin comes from only one side of the disc being spun. Because the force is exerted on the right side of the disc, the frisbee will curve slightly to the left. That's just my theory.

[theawesome1730]

And I thought 2 miniCIMs for a shooter was crazy. I look forward to seeing this launch some disks!

[Chris is me]

Have you guys directly compared this to a 2 wheel, 2 minicim shooter? I am really curious how much more distance and repeatability you get.

[nathannfm]

Originally Posted by Chris is me

Have you guys directly compared this to a 2 wheel, 2 minicim shooter? I am really curious how much more distance and repeatability you get.

The day before we had CIM > Mini > wall and it was hitting 9 feet up at about 40 feet away, this is at least double that with the extra mini

Originally Posted by Lil' Lavery

Have you given much thought to incrimentally increasing the speed of each subsequent wheel?

This is doing that to an extent as the first wheel it contacts is going 5,300 RPM and the next 2 are going 6,200, We enjoy not having to worry about chain or gearboxes and seeing as we are getting more than full court shots (with amazing accuracy, hitting the same cinder block on the wall 3 times in a row from 70 feet) this is the design we are going to go with.

Originally Posted by TheCrayButton

WOW! Very impressive you guys. That is getting some distance. Do you all plan to shoot full court?!

Thanks! It looks like that's the plan after today's tests, you will see one of them in our Vlog this week, I think they forgot what years game they were playing if you know what I mean