01-13-2006 02:38 PM

BuddyB309

Re: pic: CD 7 ball harvester

How does this work?

01-13-2006 02:51 PM

Brandon Martus

Re: pic: CD 7 ball harvester

There's some (but not much) discussion going on here too:
http://www.chiefdelphi.com/forums/sh...ad.php?t=41478

01-18-2012 12:58 PM

=Martin=Taylor=

Re: pic: CD 7 ball harvester

In a game where the bumpers significantly limit your ability to gather balls...

...I am very surprised that I'm the only one looking at this pic

01-18-2012 01:02 PM

EricLeifermann

Re: pic: CD 7 ball harvester

Trust me you're not, you're just the only one who posted about it...

01-18-2012 02:31 PM

ehochstein

Re: pic: CD 7 ball harvester

It looks like it works kind of like a waterfall... The two sides each push the ball towards the center, and the center pushes the ball into the robot. This actually reminds me of minecraft and the creep farms I used to make!

Also BlazinFire47, I like your avatar! Our team name is based off of the Zoids.

01-18-2012 03:29 PM

Chris is me

Re: pic: CD 7 ball harvester

Come on guys, why did you have to post in this thread and give people ideas?

01-18-2012 05:59 PM

=Martin=Taylor=

Re: pic: CD 7 ball harvester

I'm not mentoring, so these robots you're building better be competitive if I'm going to bother watching the game

01-18-2012 06:52 PM

BrendanB

Re: pic: CD 7 ball harvester

Team RUSH27 had something very similar in 2006.

01-18-2012 06:55 PM

Alex.q

Re: pic: CD 7 ball harvester

I like it, but it looks heavy and how much time would something like this really save you in collecting the balls? Is it really necessary?

01-18-2012 06:58 PM

Andrew Schreiber

Re: pic: CD 7 ball harvester

You weren't I just didn't need to look at it since I had it handy in my head the day of kickoff

And 08 if you look close. (I cheated, my brother helped build their 08 bot)

It can be done lightly.

01-18-2012 07:01 PM

BrendanB

Re: pic: CD 7 ball harvester

How well would you say it worked out for you in 2006/how much did you use it?

I know you used it in 2008 but the application was a little different then a drop down harvester for smaller objects!

01-18-2012 07:04 PM

Andrew Schreiber

Re: pic: CD 7 ball harvester

I was a pretty big fan in 06. It basically said that when we touched the ball it was ours. Similar in 08. It also helped with getting balls out of corners.

01-18-2012 08:01 PM

lcoreyl

Re: pic: CD 7 ball harvester

Which is itself great, but it also appears to solve the many into one problem, no?

is there much of a problem if you are trying to move the robot while picking up?

01-18-2012 08:06 PM

Andrew Schreiber

Re: pic: CD 7 ball harvester

I don't recall there being a huge one but that will also be a function of the rate you are moving compared to the rate the belts are running.

05-12-2012 10:16 PM

bearbot

Re: pic: CD 7 ball harvester

ANy inventor CAd file for other if so add it on FRC design help out the cad community

05-12-2012 11:18 PM

MichaelBick

Re: pic: CD 7 ball harvester

I would say on traction drives, it is not needed, as you can go with over the bumper pickups. Though, if you did not think of an over the bumper pickup, this can be built in between competitions and have relatively the same effect. On the other hand, this is very effective in a swerve drive, and I would even go to the length to say that in a ball game where you are doing swerve and are allowed to move past your bumper perimeter, this is absolutely necessary.

Also, 973, along with 2415, and later in the season 1323(they all work together), went with this design. 973 has published their CADs in the past, so if you want a CAD of this, you can hopefully get it then.

05-13-2012 09:39 PM

AdamHeard

Re: pic: CD 7 ball harvester

I believe the biggest advantage of such an intake is they really handle ball funneling like a champ. Jams just didn't happen, and we were always single ball wide once we entered our robot.

05-13-2012 09:41 PM

BrendanB

Re: pic: CD 7 ball harvester

Adam, what material do you make your rollers out of?

05-13-2012 09:46 PM

AdamHeard

Re: pic: CD 7 ball harvester

All the rollers on our robot (intake and conveyor) were 1.5" 1/16" wall. It would have been nice to make the rollers not exposed to impact 1/32" wall.

We made delrin external rings to space the belts, but this could have been done with tape, tread, etc...

The HUGE lesson we learned in 09 with polycord was that your rollers should be stiff for maximum efficiency.

05-14-2012 09:07 AM

Brandon Holley

Re: pic: CD 7 ball harvester

Quoted this for emphasis. We encountered the same lesson while prototyping in 09. Stiff rollers are absolutely essential.

-Brando

05-14-2012 09:56 AM

Nick Lawrence

Re: pic: CD 7 ball harvester

1503 learned this lesson too, but unfortunately too late. our rollers were thin-wall (I don't remember the exact gauge) AL tube with PVC rings pinned to it.

As a sophomore I could flex it by hand.

It didn't become until the second revision of our roller geometry, which included some green fishing line to tension the bands, which put a fair amount of lateral force on the rollers. To this day, you can still see the warp in the back rollers.

That robot could have been so much more efficient if we had known.

Whoops.

-Nick