pic: 1251 Prototype v 1.2
 

Re: pic: 1251 Prototype v 1.2
 

Phase two of the prototype. The ball went 37 ft and was at a approximately 30* angle. First one to guess (calculate) how fast the wheels were spinning within 50 rpm will receive a prize from the TechTigers.


Here is video of it.

http://media.putfile.com/Prototype-v12

Re: pic: 1251 Prototype v 1.2
 

1290 rpm? Looks good guys.

Re: pic: 1251 Prototype v 1.2
 

My Guess is ahh 1050 RPM, I think I'm closer than I originally thought.

Re: pic: 1251 Prototype v 1.2
 

I'm not a mechanical guy, so it's hard to pick out those sprocket sizes, but I'll go with about 1665 RPM. :rolleyes:

Nice prototype, remember safety FIRST!
(How about fuse/breaker and at least a switch away from the shooter)

Re: pic: 1251 Prototype v 1.2
 

What kind of accuracy can you get over that range? Can you make 10 in a row into the goal?

Re: pic: 1251 Prototype v 1.2
 

My guess would be around 1800 but its hard to tell becuase of the sprocket sizes, my guess would be the big one is around 40-50 teeth probably maybe even 60 and the small one around 10-20ish maybe....

Re: pic: 1251 Prototype v 1.2
 

1750ish...

Wetzel

Re: pic: 1251 Prototype v 1.2
 

We made about 5 or 6 shots and they all hit the ground in about the same spot.

In my opinion it is very accurate.

Re: pic: 1251 Prototype v 1.2
 

Nice shirt kid in the background ;)

Re: pic: 1251 Prototype v 1.2
 

Very nice idea. I think it might be a winner.

About 1775 rpm?

Re: pic: 1251 Prototype v 1.2
 

I have to say this seems to be the best way to shoot because the 4 wheels help guide the ball to the needed derection and the constant motion allows balls to pass though as fast as need. seems to be going 4m/s? maybe.... so i don't know any calculations for that but......2,329rpms?

Re: pic: 1251 Prototype v 1.2
 

really nice guys !! working pretty hard huh...

Re: pic: 1251 Prototype v 1.2
 

Well...I finally made it back to Chief Delphi after being away for so long.

The sprocket size should not matter at all to answer their question. They asked how fast the wheels were spinning, not the motors. With an angle and distance you need the size of the wheels and possibly height of the arc of travel to find the rpm of the wheels to launch one of the foam balls that far.

Without calculations I will guess that the wheels are spinning at 1,900 rpm.

Re: pic: 1251 Prototype v 1.2
 

The size of the wheel has nothing to do with the RPM of them (Unless you say that their mass slows down the system). If we know the output speed of the Kit gearbox, and we know the ratio to the the wheels, we can, with some error, find the RPM of the wheels. Now, if we were looking for the linear speed from a reference point on the wheel, then wheel size would matter.