Shooting from opposite side of the field

[Djur]

How accurate was it at 30' though? Aim High had a 30" goal and Rebound rumble has an 18" hoop, so you'd need to be accurate within a much smaller area.

EDIT: Check out this post. It doesn't say how accurate the shooter was, but a 60' shot is pretty good. (19:14 EST)

[davidthefat]

Have you guys considered the fact that only 4 CIMs are allowed this year? Are you willing to sacrifice 2 CIMs to use for a shooter instead of on the drive? Just from past experience, only using one per gear box (6 wheel here, not mech or omni) will trip the amp breaker. We had to gear it lower to actually move and the max FPS we got was about 8-9 FPS. Is that worth it this year? What motors are a good alternate for the shooter? Fisher Price ones?

[Djur]

Originally Posted by davidthefat

.... What motors are a good alternate for the shooter? Fisher Price ones?

Here are some comparisons of torque and rpm at maximum power.

CIMs: 45.00 oz-in; 4614 rpm.

BaneBots: 11.69 oz-in, 7300 rpm.

Fisher Price: 35.7 oz-in; 10500 rpm. (Model 0080-0673)

[davidthefat]

Originally Posted by Djur

Here are some comparisons of torque and speed/volt.

CIMs: 343.27 oz-in stall torque; 443 rpm/volt.

BaneBots: 61.1 oz-in stall torque, 608 rpm/volt.

Fisher Price: 75.4 oz-in stall torque; unknown rpm/volt. (Model 0080-0673)

Darn you GDC for limiting the usage to only 4 CIMs... But the FP is the next best thing.

[Djur]

Originally Posted by davidthefat

Darn you GDC for limiting the usage to only 4 CIMs... But the FP is the next best thing.

Maximum 2 FP, 4 BB. If you compare 2 BB to 1 FP per pitching wheel, this is what you get.

(Models used: BaneBot M7-RS775-12, Fisher Price 00801-0673)

BB: 2 * 11.69 oz-in = 23.38 oz-in @ 7300 rpm (Max power)
FP: 1 * 35.7 oz-in = 35.7 oz-in @ 10500 rpm (Estimated max power)

Fisher Price > BaneBot

Also, I should have put the values in that list at max efficiency. Fixing....

[Siri]

Just a reminder that some people don't always let the mere quantity of motors control the number of devices for which to use them.

(Of course, if you're planning on shooting while driving, this could be more complicated.)

[Djur]

There is a maximum of 22 motors... 4 CIMs for drive, 2 FPs for shooting, and 2 BaneBots or something for aiming a turret is only 8 motors.

[DavisC]

How practical does this look, what do you think of it?

For the most part the ball enter the back of the robot is picked up by a belt which uses force against plastic/rollers to move it upward and to the launcher. it gets to the launching part (motor sets B & C). Then Set B gets it moving to a good speed so that when it hits Set C, it is propelled even faster.

I tried to mark the ball path with a consistant line and marking it with arrows to get an idea of speed.
What you think? (sorry for the crude drawing, and not being to scale...)
Davis

[kaszeta]

Originally Posted by Djur

How accurate was it at 30' though?

It was reasonably precise, and very accurate in altitude, but was difficult with that robot's drive train (which started holonomic and got a tank-drive conversion at the last minute) to get the azimuthal accuracy needed.

This year is definitely more challenging than 2006 for aiming.

[Dan.Tyler]

Originally Posted by kaszeta

It was reasonably precise, and very accurate in altitude, but was difficult with that robot's drive train (which started holonomic and got a tank-drive conversion at the last minute) to get the azimuthal accuracy needed.

This year is definitely more challenging than 2006 for aiming.

I'm not sure if it was just the balls in our kit...

but they don't fly straight. Their CG is up to 1" off center... so you get some "wobble" mid-flight.

[JamesBrown]

Originally Posted by Dan.Tyler

I'm not sure if it was just the balls in our kit...

but they don't fly straight. Their CG is up to 1" off center... so you get some "wobble" mid-flight.

This is a product of the manufacturing process, when the ball is molded the side of the ball that is facing down ends up being more dense than the top part. Lower quality balls see this to a greater extent than higher quality (i.e. NERF). Depending on the manufacturer there may also be a had spot there the tube used for injecting the foam was inserted, this can also throw off the balance. All that said I haven't looked at these balls in person so I can't tell you what is actually causing it, I just know that these are concerns addressed when deciding on a manufacturing process for foam balls.

Who knew co-opping at a toy company would teach me something.