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asid61 10-08-2016 09:26

pic: 7.5" tall robot, ready to shoot
 

Kevin Leonard 10-08-2016 09:28

Re: pic: 7.5" tall robot, ready to shoot
 
So would this theoretical robot be able to cross under the low bar while holding a ball? It seems like in order to do anything useful it needs to be in the taller position.

SenorZ 10-08-2016 10:02

Re: pic: 7.5" tall robot, ready to shoot
 
I like it.
I brought up a "collapsing" shooter idea after build season, as a side project.
My team all shook their heads. :rolleyes:

Chris is me 10-08-2016 10:40

Re: pic: 7.5" tall robot, ready to shoot
 
Is there anything locking the shooter in position when it is in the firing position? It seems at least plausible that the ball being forced into the shooter could cause the shooter to give a little bit while firing, and generally you want all the rigidity you can get with such a system for consistency reasons.

I like the intake and shooter articulating together as it probably adds a lot of consistency to the ball loading.

Just curious - how are you avoiding this mechanism tangling with the battery cable when it folds up?

asid61 10-08-2016 13:48

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by Kevin Leonard (Post 1600445)
So would this theoretical robot be able to cross under the low bar while holding a ball? It seems like in order to do anything useful it needs to be in the taller position.

100%. As long as the hood is down (which it is as long as its not shooting the ball) the robot can go under the low bar with ease.

Quote:

Originally Posted by SenorZ (Post 1600446)
I like it.
I brought up a "collapsing" shooter idea after build season, as a side project.
My team all shook their heads. :rolleyes:

I'm surprised more teams didn't go with the 4-bar. It made it very easy to fit into a tiny envelope. If I had 16" to work with I could can done everything very easily indeed.

Quote:

Originally Posted by Chris is me (Post 1600453)
Is there anything locking the shooter in position when it is in the firing position? It seems at least plausible that the ball being forced into the shooter could cause the shooter to give a little bit while firing, and generally you want all the rigidity you can get with such a system for consistency reasons.

I like the intake and shooter articulating together as it probably adds a lot of consistency to the ball loading.

Just curious - how are you avoiding this mechanism tangling with the battery cable when it folds up?

The shooter can brace against the bumper while shooting. The bumpers are the biggest things on the 'bot, so I did not include them in the very nice render.

Battery cable- whats that? I see no cables...
Realistically though, the battery wires can easily just go down the sides of the battery without hitting anything or risking a nasty break.

edesirim 10-08-2016 14:37

Re: pic: 7.5" tall robot, ready to shoot
 
According to the rules, the ball has a diameter of 10". I just wanted to know if the intake folds up or something and the robot chassis itself? Just a clarifying question. :D

asid61 10-08-2016 14:58

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by edesirim (Post 1600489)
According to the rules, the ball has a diameter of 10". I just wanted to know if the intake folds up or something and the robot chassis itself? Just a clarifying question. :D

The intake folds up so that the robot can be 7.5" tall. I couldn't find a good way to keep it short and have a good intake while the ball is in the bot.

ThaddeusMaximus 10-08-2016 15:06

Re: pic: 7.5" tall robot, ready to shoot
 
Love the battery packaging.

Jeremy Germita 10-08-2016 15:07

Re: pic: 7.5" tall robot, ready to shoot
 
I don't see any clearance for a tube fitting on your hood cylinders(picture). As it stands, you'll only be able to supply air to the retract side of the cylinder. It looks like you might have enough room to just space your shooter bearing plates a little more to clear a fitting, but I haven't looked at the CAD closely enough to see if this is possible.

Other than that, I really like the usage of the four-bar. I love seeing neat linkages on robots.

asid61 10-08-2016 15:35

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by ThaddeusMaximus (Post 1600500)
Love the battery packaging.

Thank you, I was very pleased with it too. :P

Quote:

Originally Posted by Jeremy Germita (Post 1600501)
I don't see any clearance for a tube fitting on your hood cylinders(picture). As it stands, you'll only be able to supply air to the retract side of the cylinder. It looks like you might have enough room to just space your shooter bearing plates a little more to clear a fitting, but I haven't looked at the CAD closely enough to see if this is possible.

Other than that, I really like the usage of the four-bar. I love seeing neat linkages on robots.

Nooooo does this mean I have to re-render!?
I think I can push the mounting plates out by another 3/8" at least, or add a hole to allow the fitting in.
Thank you!

Greg Woelki 10-08-2016 16:48

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by asid61 (Post 1600503)
Nooooo does this mean I have to re-render!?
I think I can push the mounting plates out by another 3/8" at least, or add a hole to allow the fitting in.

A simpler option might be to use the 90 degree rotated ports version of the cylinder (Bimba offers this for their rear pivot cylinders, I'd imagine other manufacturers do as well).

asid61 10-08-2016 17:25

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by Greg Woelki (Post 1600514)
A simpler option might be to use the 90 degree rotated ports version of the cylinder (Bimba offers this for their rear pivot cylinders, I'd imagine other manufacturers do as well).

Given that it's already a custom 3.6" stroke cylinder, this is a great option actually.

Chris is me 10-08-2016 17:32

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by asid61 (Post 1600517)
Given that it's already a custom 3.6" stroke cylinder, this is a great option actually.

Is it really not possible to go to a standard size here? It can't be that hard to add .1" to the length of your ball joint or something.

asid61 10-08-2016 17:38

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by Chris is me (Post 1600519)
Is it really not possible to go to a standard size here? It can't be that hard to add .1" to the length of your ball joint or something.

Because of the tiny packaging and cramped spacers, especially near the shooter/hood, I couldn't make it 3.5" or 4". 3.75" is a custom size anyway, or I would have to use metric. I did try to use a standard size, but the layouts just didn't work out.

frcguy 10-08-2016 21:44

Re: pic: 7.5" tall robot, ready to shoot
 
How well would those little read Mecanum wheels on the side of the intake work for directing balls closer to the intake? Do they make a noticeable improvement for ball collection?

asid61 10-08-2016 21:48

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by frcguy (Post 1600538)
How well would those little read Mecanum wheels on the side of the intake work for directing balls closer to the intake? Do they make a noticeable improvement for ball collection?

The balls would get to the bumpers, then get funneled along the bumpers with the mecanums. Most teams used larger mecanums this year, but I know that at least a few teams used very small mecanums. It's possible to bore out the hubs on those and use several mecanums instead of just 2, but I wanted to avoid making custom modifications as much as possible.

Golfer4646 10-08-2016 22:05

Re: pic: 7.5" tall robot, ready to shoot
 
With this robot, what would your starting configuration be? (Aka, are you able to hold a boulder, while still being within frame perimeter?)

asid61 10-08-2016 22:14

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by Golfer4646 (Post 1600540)
With this robot, what would your starting configuration be? (Aka, are you able to hold a boulder, while still being within frame perimeter?)

I believe I can squeeze a boulder into the intake without leaving the frame perimeter, but not 100% on that. Most likely I would start with the boulder on top of the battery with the hood flipped up, then when the match begins run the shooter backwards to bring it into the robot.

AdamHeard 10-08-2016 22:40

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by asid61 (Post 1600521)
Because of the tiny packaging and cramped spacers, especially near the shooter/hood, I couldn't make it 3.5" or 4". 3.75" is a custom size anyway, or I would have to use metric. I did try to use a standard size, but the layouts just didn't work out.

The custom sizes have poor lead times.

You can definitely make this work with a longer or shorter cylinder, don't forget you don't have to actually use the full travel of a cylinder (and can externally set the travel).

You'd want some mechanical adjustment of shooter position anyway so that you're not remaking parts to tune shots (separate from what you can achieve with software).

asid61 10-08-2016 22:50

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by AdamHeard (Post 1600542)
The custom sizes have poor lead times.

You can definitely make this work with a longer or shorter cylinder, don't forget you don't have to actually use the full travel of a cylinder (and can externally set the travel).

We ordered custom sizes in 2015 with only around a 2-week turnaround, which isn't great but it's not SDP-SI level either. :P
All of my trials I did with a layout sketch like you did in your RAMP video (great series BTW). I tried with 3.5" but found that I would be unable to flip the hood to the two positions I wanted, and 4" would make it impossible to mount. If I have changed the place where it attached to the hood, it may have been possible to use a shorter cylinder, only moving the cylinder forward caused an interference with something else while folded.
If I had used a custom cylinder extension rod I would have gone a lot farther, but I figured it would be easier to just order the customs.
I wasn't thinking about the turnaround while I was making this. If I had, I probably would have opted to move the hood-side cylinder mount closer to the hood pivot, even though it would have taken extra layout work.

Sperkowsky 10-08-2016 23:18

Re: pic: 7.5" tall robot, ready to shoot
 
Are there any tensioners on the shooter belt that runs through the tube? If so could I get a look at it?

asid61 10-08-2016 23:34

Re: pic: 7.5" tall robot, ready to shoot
 
Quote:

Originally Posted by Sperkowsky (Post 1600547)
Are there any tensioners on the shooter belt that runs through the tube? If so could I get a look at it?

Yeah, they're in the far side of the tube where you can't see. I'll get a picture up later.


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