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  #16   Spotlight this post!  
Unread 24-01-2017, 11:29
Conor Ryan Conor Ryan is offline
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Re: Rapid fuel feeding into shooter

25 in 2006 had a brilliant shooter and straight up dominated Aim High. Essentially they had a flywheel and a mill to feed the ball. Flywheel on a live axle, and then a mill that went around the flywheel on a dead axle, both were powered by different motors. The mill allowed them to control the out put of the balls effectively, and run it backwards if anything jammed. Take a look at any of their match videos.

We are currently working on a prototype that will shoot 3 balls wide with a mill that goes around it. Looking forward to the results.
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Unread 24-01-2017, 11:59
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Re: Rapid fuel feeding into shooter

Quote:
Originally Posted by Conor Ryan View Post
25 in 2006 had a brilliant shooter and straight up dominated Aim High. Essentially they had a flywheel and a mill to feed the ball. Flywheel on a live axle, and then a mill that went around the flywheel on a dead axle, both were powered by different motors. The mill allowed them to control the out put of the balls effectively, and run it backwards if anything jammed. Take a look at any of their match videos.

We are currently working on a prototype that will shoot 3 balls wide with a mill that goes around it. Looking forward to the results.
I am a firm believer in the wide shooters. Some really basic prototyping (i.e. a plywood box and some broom handles with poly cord as actuators, all run on cordless drills) proved an efficient way to unleash the hoard, and that was just guessing where the actuators should be and relying on gravity. From the testing that I witnessed we sent 42 balls out in 3.7 seconds, not bad IMO.
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Unread 24-01-2017, 13:02
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Re: Rapid fuel feeding into shooter

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Originally Posted by Skyehawk View Post
From the testing that I witnessed we sent 42 balls out in 3.7 seconds, not bad IMO.
How many made it into the goal?
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  #19   Spotlight this post!  
Unread 24-01-2017, 13:21
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Re: Rapid fuel feeding into shooter

This was a hopper test, no shooter on it...
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Unread 24-01-2017, 13:36
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Re: Rapid fuel feeding into shooter

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Originally Posted by s_forbes View Post
If you are asking about the prototype videos that we posted, we are using a sticky shelf lining material from Walmart: https://www.walmart.com/ip/Duck-12-x...Liner/16486841 It has good grip on the balls, but if you use it like we did in those blender prototypes it wears out extremely quickly. Once it wears out it doesn't kick the balls out of the bin nearly as fast.
Have you guys tried some of the flat polycord belting from McMaster as a replacement? Might have a longer robot life compared to drawer liners.
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Unread 24-01-2017, 13:41
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Re: Rapid fuel feeding into shooter

I've been pondering this over the last couple weeks, so this is what I've thought of. We're building and testing it this week. Basically the balls roll in one direction and fall down into a chute that takes them to the shooter. They are able to fall into the chute whenever they want, which helps prevent jamming.
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  #22   Spotlight this post!  
Unread 24-01-2017, 13:43
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Re: Rapid fuel feeding into shooter

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Originally Posted by BrendanB View Post
Have you guys tried some of the flat polycord belting from McMaster as a replacement? Might have a longer robot life compared to drawer liners.
We haven't tried that, but that's a great suggestion for a flap material. (link to mcmaster product)

We ditched this mixer concept for a different one, so you won't see a high powered trashcan blender on our robot this year.
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Unread 24-01-2017, 14:00
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Re: Rapid fuel feeding into shooter

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Originally Posted by maxnz View Post
I've been pondering this over the last couple weeks, so this is what I've thought of. We're building and testing it this week. Basically the balls roll in one direction and fall down into a chute that takes them to the shooter. They are able to fall into the chute whenever they want, which helps prevent jamming.
You only included the assembly file in your GrabCAD. Without all of the parts files, we can't view the assembly. I suggest you look for a button in SolidWorks called "Pack and Go." It'll create a compressed folder of all the parts you need form the assembly.
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Unread 24-01-2017, 14:08
Lireal Lireal is offline
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Re: Rapid fuel feeding into shooter

Quote:
Originally Posted by Cothron Theiss View Post
You only included the assembly file in your GrabCAD. Without all of the parts files, we can't view the assembly. I suggest you look for a button in SolidWorks called "Pack and Go." It'll create a compressed folder of all the parts you need form the assembly.
I could view it. Just click on the ASM name and you can see it in browser.
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Unread 24-01-2017, 14:15
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Re: Rapid fuel feeding into shooter

Quote:
Originally Posted by maxnz View Post
I've been pondering this over the last couple weeks, so this is what I've thought of. We're building and testing it this week. Basically the balls roll in one direction and fall down into a chute that takes them to the shooter. They are able to fall into the chute whenever they want, which helps prevent jamming.
When that hopper and feeder are static it will probably jam. It most likely needs some form of an agitator, which could be as simple as shaking the whole robot with the drivetrain. I only say this because of the several different arrangements of hopper concepts we tried there was almost always a configuration in which the balls 'self-locked' over the exit of the hopper. Not to say there isn't a passive design that works, we just didn't come across it.
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Unread 24-01-2017, 14:42
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Re: Rapid fuel feeding into shooter

Maxnz-Looks like a cool design. In your drawing I see an inner radius of a circle roughly 6.5 from the center of the 2 7/8" banebot wheel, which looks to be intended for contact with the 5" dia. balls, but the outer circle is roughly 9.5" radius from the wheel center. This would not make contact with the ball that I can see so I am just curious as to the purpose of this outer radius in the design?

Thanks!

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Unread 24-01-2017, 16:01
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Re: Rapid fuel feeding into shooter

Quote:
Originally Posted by maxnz View Post
I've been pondering this over the last couple weeks, so this is what I've thought of. We're building and testing it this week. Basically the balls roll in one direction and fall down into a chute that takes them to the shooter. They are able to fall into the chute whenever they want, which helps prevent jamming.
We prototyped something similar to this and found the balls would "bridge" against the back wall above the trough. You may need to look in to an agitator of some kind. Oscillating the back wall with a cam might be enough to break up the jams.
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Unread 26-01-2017, 15:05
Brandon_L Brandon_L is offline
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Re: Rapid fuel feeding into shooter

For those not shooting x balls wide, has anyone tried a polycord conveyor that funnels the balls from many wide to one wide?

Something like just a regular wide conveyor but with guides in it like so:
/ \

Do you think this has the possibility of jamming?
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Unread 26-01-2017, 15:16
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Re: Rapid fuel feeding into shooter

Quote:
Originally Posted by Brandon_L View Post
For those not shooting x balls wide, has anyone tried a polycord conveyor that funnels the balls from many wide to one wide?

Something like just a regular wide conveyor but with guides in it like so:
/ \

Do you think this has the possibility of jamming?
I think it has the possibility of jamming at low speeds (a few feet/sec). It may have potential ludicrous belt speeds. I would be interested if anyone tries it at high speeds.

You may want to look into non-straight geometries, somethings like the attached image may work better. The Y component is exaggerated, you would probably want the width change to happen over a much longer length.
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Unread 26-01-2017, 15:29
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Re: Rapid fuel feeding into shooter

Quote:
Originally Posted by Brandon_L View Post
For those not shooting x balls wide, has anyone tried a polycord conveyor that funnels the balls from many wide to one wide?

Something like just a regular wide conveyor but with guides in it like so:
/ \

Do you think this has the possibility of jamming?
A good way to prevent jamming is to make the entire "floor" of the hopper move. This moves jammed balls out of the way so that new balls can fall into their place.

This is the concept we are planning to use, modeled at 1/3 scale with gamepieces that are affordable. This spits balls out into two streams, but if you make half of the hopper it should shoot balls out into one stream reliably.

https://www.youtube.com/watch?v=kQRavPxOIM0
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