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=Martin=Taylor= 31-01-2009 23:34
pic: Custom Wheels
 

Kyle Love 31-01-2009 23:34
Re: pic: Custom Wheels
 
Nice shooter wheels.

RyanN 31-01-2009 23:35
Re: pic: Custom Wheels
 
What do I think?

Umm... bad year to decide to make your own wheels...

Oops.... You mean 'those' wheels. They look aluminumy... Someone spent a lot of time either making those or watching them be made assuming you did it on a lathe.

Woodworker88 01-02-2009 00:26
Re: pic: Custom Wheels
 
Quote:
Originally Posted by RyanN (Post 812020)
Oops.... You mean 'those' wheels. They look aluminumy... Someone spent a lot of time either making those or watching them be made assuming you did it on a lathe.
Those toolpaths look like it was done on a CNC mill or rotary table. Nice work, you guys.

=Martin=Taylor= 01-02-2009 00:37
Re: pic: Custom Wheels
 
Quote:
Originally Posted by Woodworker88 (Post 812045)
Those toolpaths look like it was done on a CNC mill or rotary table. Nice work, you guys.
Our team doesn't have the milling abilities to do these, so we had a sponsor mill them out. Then our students finished them up on the lathe.

They are by far the most complex/coolest looking parts we’ve ever made!

To give you some proportions they are 6" OD.

They are actually fly-wheels/roller-hubs. Hopefully they'll allow us to fire vast quantities of balls very quickly without losing speed and range.

R.C. 01-02-2009 01:37
Re: pic: Custom Wheels
 
Quote:
Originally Posted by Hachiban VIII (Post 812051)
Our team doesn't have the milling abilities to do these, so we had a sponsor mill them out. Then our students finished them up on the lathe.

They are by far the most complex/coolest looking parts we’ve ever made!

To give you some proportions they are 6" OD.

They are actually fly-wheels/roller-hubs. Hopefully they'll allow us to fire vast quantities of balls very quickly without losing speed and range.
And i thought your guys 07 arm was a beast. I can't wait to see that crazy shooter. Have a great build season and see you at DAVIS. :D

amariealbrecht 01-02-2009 11:53
Re: pic: Custom Wheels
 
wow your shooter is going to be great! I hope everything continues to go well for you this year and good luck at all your competitions!

MrForbes 01-02-2009 12:27
Re: pic: Custom Wheels
 
Quote:
Originally Posted by Hachiban VIII (Post 812051)
They are actually fly-wheels/roller-hubs. Hopefully they'll allow us to fire vast quantities of balls very quickly without losing speed and range.
We have a very low inertia shooter driven by one CIM with about 1.5 reduction, and we don't have any trouble with shooter speed dropping when it shoots out 5 balls in rapid succession on full speed. We do notice that the motor slows down a bit when we have the speed reduced for shorter range, but I think if we get a speed sensor on the shooter wheel and set up a feedback loop to keep speed constant, it will be fine.

Very nice shooter wheels! what's the weight?

=Martin=Taylor= 01-02-2009 23:41
Re: pic: Custom Wheels
 
Quote:
Originally Posted by squirrel (Post 812212)
We have a very low inertia shooter driven by one CIM with about 1.5 reduction, and we don't have any trouble with shooter speed dropping when it shoots out 5 balls in rapid succession on full speed. We do notice that the motor slows down a bit when we have the speed reduced for shorter range, but I think if we get a speed sensor on the shooter wheel and set up a feedback loop to keep speed constant, it will be fine.

Very nice shooter wheels! what's the weight?
You appear to have misunderstood me when I said "vast quantities of balls very quickly." Think 10 balls in a fraction of a second :D

We actually modeled our shooter using rotational momentum, and imagined that the balls being fired were "collisions" slowing the wheel down. Adding the flywheels greatly improved consistency. Recharge went from about 1 second down to like .2 seconds. Of course we'll have to see about my math :rolleyes:

They weigh 2.5 lbs. each. We know how much the final bot will weigh from CAD and this is a perfectly acceptable amount for us.

MrForbes 01-02-2009 23:50
Re: pic: Custom Wheels
 
Sounds neat! We have trouble getting more than 5 balls per second into the shooter....shooter speed is not the limiting factor ;)

I wonder if there's going to be a fps limit this year like in 2006?

Andy L 02-02-2009 00:22
Re: pic: Custom Wheels
 
Quote:
Originally Posted by Hachiban VIII (Post 812525)
You appear to have misunderstood me when I said "vast quantities of balls very quickly." Think 10 balls in a fraction of a second :D

We actually modeled our shooter using rotational momentum, and imagined that the balls being fired were "collisions" slowing the wheel down. Adding the flywheels greatly improved consistency. Recharge went from about 1 second down to like .2 seconds. Of course we'll have to see about my math :rolleyes:

They weigh 2.5 lbs. each. We know how much the final bot will weigh from CAD and this is a perfectly acceptable amount for us.
You have managed to scare me... What's your range like?

=Martin=Taylor= 02-02-2009 00:29
Re: pic: Custom Wheels
 
Quote:
Originally Posted by Andy L (Post 812549)
You have managed to scare me... What's your range like?
It was calculated at around 6'. We'll have to wait a few days to see for sure.

6' is more for awesomeness. I doubt we'd risk such a long shot in a match. 2-4' is more reasonable.

MrForbes 02-02-2009 00:31
Re: pic: Custom Wheels
 
Have you dont any prototyping with a flywheel shooter?

Andy L 02-02-2009 00:33
Re: pic: Custom Wheels
 
Quote:
Originally Posted by Hachiban VIII (Post 812554)
It was calculated at around 6'. We'll have to wait a few days to see for sure.

6' is more for awesomeness. I doubt we'd risk such a long shot in a match. 2-4' is more reasonable.
Wow, someone that thinks the same as our team. I see all these shooters shooting across shops for some reason, well I hope I get to see it in action at SV and Davis(are you guys at Davis this year?) on our side of the field preferably.

GaryVoshol 02-02-2009 06:52
Re: pic: Custom Wheels
 
Quote:
Originally Posted by squirrel (Post 812529)
I wonder if there's going to be a fps limit this year like in 2006?
Hush! Don't give "them" any ideas. :yikes:

XXShadowXX 02-02-2009 08:56
Re: pic: Custom Wheels
 
how well do they grip the balls, thats one issue I've foreseen, is that your flywheels won't impart enough momentum on the balls in the time that they are in contact, do you plan to say wrap them in Velcro?

MrForbes 02-02-2009 09:06
Re: pic: Custom Wheels
 
gum roughtop tread works really well, there are other materials also that can grip the balls well. Velcro affects the fabric on the balls, so it's probably not the way to go.

=Martin=Taylor= 02-02-2009 10:40
Re: pic: Custom Wheels
 
Quote:
Originally Posted by XXShadowXX (Post 812615)
how well do they grip the balls, thats one issue I've foreseen, is that your flywheels won't impart enough momentum on the balls in the time that they are in contact, do you plan to say wrap them in Velcro?
They're never going to touch the balls.

We'll use wedge-top or neoprene rubber for traction on the roller surface.

RogerR 02-02-2009 11:07
Re: pic: Custom Wheels
 
Quote:
Originally Posted by Hachiban VIII (Post 812525)
You appear to have misunderstood me when I said "vast quantities of balls very quickly." Think 10 balls in a fraction of a second :D

We actually modeled our shooter using rotational momentum, and imagined that the balls being fired were "collisions" slowing the wheel down. Adding the flywheels greatly improved consistency. Recharge went from about 1 second down to like .2 seconds. Of course we'll have to see about my math :rolleyes:

They weigh 2.5 lbs. each. We know how much the final bot will weigh from CAD and this is a perfectly acceptable amount for us.
I'm curious about your set-up; are you using some sort of clutch system to link these to your 'shooter'? traditional wisdom says that by adding rotating mass, you increase spun-up time (I assume this is what you mean by 'recharge'), though I doubt that an orbit ball would significantly effect the RPMs of these beasts.

Ironically, one of my teams went the exact opposite direction, minimizing roller mass, and instead using the shooting motors themselves to give a high rate of fire.

=Martin=Taylor= 02-02-2009 12:19
Re: pic: Custom Wheels
 
Quote:
Originally Posted by RogerR (Post 812658)
...traditional wisdom says that by adding rotating mass, you increase spun-up time (I assume this is what you mean by 'recharge'), though I doubt that an orbit ball would significantly effect the RPMs of these beasts.
Yes that is correct.

Spin up time will be reduced, but less speed will be lost per shot, so it will be easier to maintain speed.

By constantly spinning the drum slowly we can ramp it up to firing power quickly whenever the need arises.

It is useful to reduce mass from the center of the rotating object, since this mass will not be spinning as fast as that on the edges. This is why we milled out the center. All the mass is on the periphery.

We actually built a very similar dual-ball shooter in '06 that suffered a great deal from recharge. Sitting on top of the ramp, it could only get the first two balls in before it lost speed. :(


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