01-02-2006 12:55

Elgin Clock

Re: pic: Team Rush 27 - Shooter Concept

Ooh.. So pretty.

Is this a stationary attachment, or is it turning, and if so how many times?
If so, where are the wires headed?

Great CAD so far. Hope to see it soon.

01-02-2006 13:02

BoyWithCape195

Re: pic: Team Rush 27 - Shooter Concept

Its seems to be made to turn. You can see a globe motor mounted upside down to the left. I think they were just to lazy to actually make the sprocket and at the moment there is just a solid ring.

01-02-2006 13:04

ajlapp

Re: pic: Team Rush 27 - Shooter Concept

pictures of the turret have already surfaced.......so yes it spins.

it spins as much as we want it to, though i doubt it would ever travel more than 180 degrees. this turret is for precision movement....it mimicks the camera gimble.

as for wires, i can't say. we've managed to build a turret for the last 5 years....wires have never been a "go," "no go," item.......they will most likely run around the back of the device and be placed inside some slick looking wire loom. leave plenty of slack...and bam!, your wired.

i'll let the electric knobs work on that.

not too lazy......

there is no sprocket involved. see either picture already posted. it is a 129 tooth, 12DP, 20 degree PA spur gear.

that is hard to draw! not to mention frivolous. keep in mind the title of the pic..."concept." this implies that you aren't seeing a completed drawing.

01-02-2006 13:09

Madison

Re: pic: Team Rush 27 - Shooter Concept

I've been curious to see what some other folks do to 'shield' their mechanisms as per the rules. Do you plan to cover the wheels more than what is shown or do you feel that the standoffs are adequate?

01-02-2006 13:24

ajlapp

Re: pic: Team Rush 27 - Shooter Concept

i think the standoffs are adequate. it is a tough call though.....

as designed there is plenty of room to insert a finger and have it severely mangled. but there is enough room to keep from having the finger wedged. for now the standoffs stay.

there are also other mechanisms near or around the shooter.....these may ultimately provide enough protection from the shooter wheel.

01-02-2006 13:32

Alex Cormier

Re: pic: Team Rush 27 - Shooter Concept

so, how do the balls go from your other pictures to be put within the wheels to shoot towards the goal? the force of pushing them upwards allows them to get sucked in with in your shooter and there it goes?

01-02-2006 13:32

sanddrag

Re: pic: Team Rush 27 - Shooter Concept

Seems like it would be safer without the standoffs. I'm thinking the standoffs would help the wheel suck your fingers in, instead of keeping them out. Full shield or no shield is what I say.

01-02-2006 13:38

ajlapp

Re: pic: Team Rush 27 - Shooter Concept

the balls simply transfer from the ball elevator, through the turret and into the shooter. you can't see from these pics, but the design allows for the lift rollers to get extremely close to the underside of the turret.......balls pop up through the bottom and fly away.

the design was executed in such a way that the location of the turret and the elevation of the gun don't change the loading location.

01-02-2006 14:39

Lil' Lavery

Re: pic: Team Rush 27 - Shooter Concept

I want me one of those!
...........or two

01-02-2006 15:47

Craig Roys

Re: pic: Team Rush 27 - Shooter Concept

I should have looked at this post first - answers my question from the picture in your other post. Looks sweet.

Craig

01-02-2006 15:52

Marcel

Re: pic: Team Rush 27 - Shooter Concept

Whoever designed that, has skill.

01-02-2006 16:30

greencactus3

Re: pic: Team Rush 27 - Shooter Concept

meh. they downloaded stuff. slackers
but wow. detail. with we had the resources to pull sumthing like that off.
if you dont connect the pitching of the 2 sides, then you can control more aspects of the ball.
launch angle, direction are obviously doable, and by changing the rotation speeds of either side will change the spin sideways, and by haveing a different launch angle with right and left you'll have a sorta rifling rotatioin too. fun!!

01-02-2006 17:37

Elgin Clock

Re: pic: Team Rush 27 - Shooter Concept

Using what software?
I can crank that out in about 10-15 minutes in SolidWorks.
But then again, I have been using it for at least 3-4 years now.

01-02-2006 18:52

Paul Copioli

Re: pic: Team Rush 27 - Shooter Concept

Elgin,

I have a new found respect for you now that I know you use SolidWorks.

I have been using it since 1997 and the ThunderChickens have been using it since 2001.

Anthony,

Nice shooter. I'm not a big fan of the side by side, but you guys looked like you have a good design. BTW, I agree with Elgin, it is pretty easy to draw gears in SW, but it is definitely unnecessary.

-Paul

01-02-2006 18:55

Elgin Clock

Re: pic: Team Rush 27 - Shooter Concept

Thanks Paul.

Yeah, basically to make it from scratch in solidworks, I would draw one tooth, and rotate however many times.

Nowadays, gear manufacturers have all CAD drawings in easily converted formats for your applications that you could just drag and drop in.

We customized a gear just the other day from the firstcadlibrary by extruding cuts and what not, and it was pretty straight forward.

01-02-2006 21:23

bbehnke

Re: pic: Team Rush 27 - Shooter Concept

ya im not realy a fan of the side by side wheels either. wat i think would be alot better is putting them vertical so u dont have a problem with turning while the ball is in flight due to one whele spining faster/slower than the other. the vertical one would somewhat elimate this factor and it would be a better idea if the bottom one is spinning faster than the top to creat back-spin on the ball. although i looks realy good

02-02-2006 00:17

Parker

Re: pic: Team Rush 27 - Shooter Concept

Keep in mind that if the wheels aren't spinning at exactly the same speed, the balls won't fly straight. Every motor, even if they're the same design, will spin at different speeds.

02-02-2006 00:25

Chriszuma

Re: pic: Team Rush 27 - Shooter Concept

A simple chain and sprockets can be used to ensure that both wheels are spinning at exactly the same speed, and additionally eliminate the need for two motors, saving weight. In our mockup testing, this actually outperformed alot of other methods.

02-02-2006 00:57

Alekat

Re: pic: Team Rush 27 - Shooter Concept

But couldn't you have the same problem with verticle rollers moving different speeds? And instead of having poor accuracy left and right it is poor accuracy up and down? it's a circular goal so either way you'd be likely to miss if you don't match your speeds.

02-02-2006 08:41

ajlapp

Re: pic: Team Rush 27 - Shooter Concept

Thanks for all of the great responses......

As for the gear drawing and SolidWorks. I did draw the gear in AutoCad, and I do have it in my solid models, both UG and Inventor. Though it is my general practice to leave that sort of CPU draining detail out of my drawings.

Fear not, for I have built many a turret, and have designed many a spur gear......I have even milled one that was nearly twice that diameter.

The side-to-side design.......

Also not my favorite. We chose it after several prototypes mainly because of it's low profile. A vertical style two-wheeled shooter was becoming to tall, and a one-wheeled design didn't allow for the lowered RPM and increased torque we were looking for in a shooter.

We have tons of adjustability in the design which allows us to tune the wheels for both compression and alignment. To keep both wheels spinning together we've opted to skip any sort of mechanical coupling and just tune the wheels using a tachometer. Worked well for the prototype.