Chief Delphi - 1706 Shooter Reveal

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- - 1706 Shooter Reveal (http://www.chiefdelphi.com/forums/showthread.php?t=143627)

squad1706

11-02-2016 11:26

1706 Shooter Reveal

Well, here is our shooter in its wooden prototype form. It uses a coil spring that would be found on a pickup truck, pulled back about 6 inches I believe for a shooting force somewhere in the area of about 5-600 lbs. In this form we pull it back using a come along, and then release it with a quick release clip.

I was talking to someone on the electronics team and he came up with the idea for a name, The "Aluminum Archer". It's not bad IMO.

https://youtu.be/sWY1oqVhQxk

cjl2625

11-02-2016 11:54

Re: 1706 Shooter Reveal

philso

11-02-2016 13:35

Re: 1706 Shooter Reveal

You will have to find a producer for some automotive TV show and shoot him with your boulder. That would get you even with Jezza.

It looks like you have lots of power. Do you need that much power? Is it safe? Is it consistent enough? How large will the final shooter be and how much will it weigh?

rsisk

11-02-2016 13:39

Re: 1706 Shooter Reveal

I feel sorry for the robot that tries to block that shot.

RoboChair

11-02-2016 13:42

Re: 1706 Shooter Reveal

You might find the following historical articles of interest for researching more naming opportunities.

https://en.wikipedia.org/wiki/Catapult
https://en.wikipedia.org/wiki/Ballista
https://en.wikipedia.org/wiki/Petraria_Arcatinus (bow powered stone thrower)

squad1706

11-02-2016 14:05

Re: 1706 Shooter Reveal

Quote:

Originally Posted by cjl2625 (Post 1538568)

Haha! My thoughts exactly when shot 4 went off.

Quote:

It looks like you have lots of power. Do you need that much power? Is it safe? Is it consistent enough? How large will the final shooter be and how much will it weigh?

Wow, haha. A.) Yes, this was the amount of force calculated to get us scoring the high goal. We may have to modify once we get a shooter on the bot, but until then those are the rough specs. You can never have too much POWAAAAAAAAAAAAA. B.) It is safe, sort of... I wouldn't want to stand in front of it, but it has never come apart or exploded. C.) It is very consistent actually, again, we are still tweaking, but once we trim those guides a bit more, it should be even more consistent. D.) I'm not sure on the final design, although it is fairly compact, and is designed to sit in the middle of out bot, which is not that big if you watched the frame assembly video. Total weight, again, I'm not sure, but im gonna take a guess at about 15-20 lbs. I'll try and get a better measurement today.

Quote:

I feel sorry for the robot that tries to block that shot.

Same, ::safety::

Chris Endres

11-02-2016 14:08

Re: 1706 Shooter Reveal

Holy crap, chill.

dradel

11-02-2016 14:15

That amount of power seems wayyyy excessive !!!! Which means it is about perfect!!
Goes right inline with "if at first you do not succeed, get a bigger hammer ! "

philso

11-02-2016 14:24

Re: 1706 Shooter Reveal

Quote:

Originally Posted by squad1706 (Post 1538643)

Haha! My thoughts exactly when shot 4 went off.

Wow, haha. A.) Yes, this was the amount of force calculated to get us scoring the high goal. We may have to modify once we get a shooter on the bot, but until then those are the rough specs. You can never have too much POWAAAAAAAAAAAAA. B.) It is safe, sort of... I wouldn't want to stand in front of it, but it has never come apart or exploded. C.) It is very consistent actually, again, we are still tweaking, but once we trim those guides a bit more, it should be even more consistent. D.) I'm not sure on the final design, although it is fairly compact, and is designed to sit in the middle of out bot, which is not that big if you watched the frame assembly video. Total weight, again, I'm not sure, but im gonna take a guess at about 15-20 lbs. I'll try and get a better measurement today.

Same, ::safety::

Are you sure your shooter structure is strong enough to last a whole season? People have been seriously injured when changing the coil springs in their car and they were not using the proper equipment/techniques for compressing the springs. While it may be fun to build an overpowered mechanism, it is poor engineering practice. It will also cost you in terms of weight, space, reliability, risk etc. A local team had a similar shooter in 2014. It worked well but the team members were too afraid to work on it and they replaced it with a different type of shooter that did not use large springs.

D_Price

11-02-2016 14:51

Re: 1706 Shooter Reveal

That is a whole lot of power! I like it.

Brandon Holley

11-02-2016 14:56

Re: 1706 Shooter Reveal

Quote:

Originally Posted by philso (Post 1538651)

While it may be fun to build an overpowered mechanism, it is poor engineering practice.

While in general I agree with your sentiment about safety - I do think the word 'overpowered' could be a bit of a leap if there goal was to fire the ball in as straight a line as possible. Maybe this is their goal...

-Brando

vhcook

11-02-2016 15:16

Re: 1706 Shooter Reveal

Impressive power.

Do you have a cable down the middle to keep the spring somewhat contained if it experiences a rapid unscheduled disassembly?

waialua359

11-02-2016 15:19

Re: 1706 Shooter Reveal

How accurate is this?
In shooting at the high goal from the safe zone long shot, whats the percentage?

kyle_hamblett

11-02-2016 15:32

Re: 1706 Shooter Reveal

We were beginning to wonder if anyone else had thought of this... We have been actively working with a linear spring launcher and have found great success. We originally planned to have a spring that could have easily replaced a spring in an ATV, but since dialed it back due to concerns regarding the entire thing blowing up. Best of luck in tuning that monster.

Ryan Dognaux

11-02-2016 15:37

Re: 1706 Shooter Reveal

Like the power! We prototyped something similar for a linear puncher. Any ideas on how you'll get the ball into it intake-wise?

carpedav000

11-02-2016 17:10

Re: 1706 Shooter Reveal

WOW, and we thought our spring shooter was ridiculous! :eek:

We did the math as well and got a number closer to 200lbs @ 5" of compression, so with an extra 400lbs and inch of compression I can safely assume this thing shoots EXPONENTIALLY harder than ours! Good job ::safety::

Ether

11-02-2016 18:09

Re: 1706 Shooter Reveal

Quote:

Originally Posted by carpedav000 (Post 1538754)

We did the math as well and got a number closer to 200lbs @ 5" of compression, so with an extra 400lbs and inch of compression I can safely assume this thing shoots EXPONENTIALLY harder than ours!

If you're both using springs it's probably closer to linear (if you're talking about force) or a power function (if you're talking about energy). :)

dwodrich

11-02-2016 19:14

Re: 1706 Shooter Reveal

Quote:

Originally Posted by Ryan Dognaux (Post 1538705)

Like the power! We prototyped something similar for a linear puncher. Any ideas on how you'll get the ball into it intake-wise?

We don't have a cool cord system like yours, just rollers on top. Then we won't take the ball into the robot just hold it with the intake. Then we get the intake out of the way or we launch it through the goal.

anishde

11-02-2016 21:36

Re: 1706 Shooter Reveal

I can see it now - THE TOWER FIGHTS BACK.
The boulder flies into the high goal...and ricochets back out.

squad1706

11-02-2016 23:30

Re: 1706 Shooter Reveal

Ok, things to fix!

Most important, our shooter is actually more in the neighborhood of 200lbs of force. I had in my mind that the spring was a 750, when it was really a 375. So, not nearly as much power as in the video or as stated.

philso

12-02-2016 00:05

Re: 1706 Shooter Reveal

Quote:

Originally Posted by Brandon Holley (Post 1538669)

How straight does it need to be? At some point, one passes the point of diminishing returns. A mechanical failure in a mechanism with that much stored energy is not very funny.

MARS_James

12-02-2016 11:21

Re: 1706 Shooter Reveal

Quote:

Originally Posted by squad1706 (Post 1538937)

Based on seeing the video, I have one piece of advice, make sure your autonomous coding and driver/shooter skills are on point. I bring this up because this robot can only ever accidentally shoot a volunteer once before a head ref is going to have the "if it ever happens again your robot will be considered unsafe" conversation

squad1706

12-02-2016 11:42

Re: 1706 Shooter Reveal

Quote:

Originally Posted by MARS_James (Post 1539116)

Very true. What I meant in that statement that you quoted me in was sort of misleading. Yes, we are aware this is a design that has ALOT of power. We are also making sure that this device will be safe, accurate, and stable as well. We have never had this device launch in an unsafe way, and will continue to make sure it doesn't.

Thank you for your concerns though, as this is a design with many posibilities for malfunctions.

Munchskull

12-02-2016 12:43

Re: 1706 Shooter Reveal

Can I borrow that? My school is having a dodge ball tournament tomorrow and my friend has dibs on our shooter.

MaGiC_PiKaChU

12-02-2016 14:51

Re: 1706 Shooter Reveal

We have a similar concept... but yours sounds like war machine when it shoots :eek:

jodge1706

12-02-2016 20:17

Re: 1706 Shooter Reveal

Quote:

Originally Posted by Ryan Dognaux (Post 1538705)

Like the power! We prototyped something similar for a linear puncher. Any ideas on how you'll get the ball into it intake-wise?

We do, using rollers, it will suck the ball into the front of the shooter where the ball is housed. This rollers will actually move to get out of the way of the shooter whenever we don't need them anymore. So the intake will be attached to the arm that holds our shooter.

IronicDeadBird

13-02-2016 21:19

Re: 1706 Shooter Reveal

Quote:

Originally Posted by RoboChair (Post 1538635)

Don't forget this!

https://en.wikipedia.org/wiki/Gastraphetes

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