28-01-2006 20:58

blue_crew

Re: pic: 1559 so far

i love the spacer on the kitbot transmission output!!!! thats awesome.
What are the skids on the right of the robot made out of?

28-01-2006 21:08

bradleym1559

Re: pic: 1559 so far

Plastic 4" spherical casters borrowed for last year's robot. Worked well then, hopefully they'll do the same this year if the team decides to stick with em. Pretty cool stuff.

28-01-2006 21:46

Zach Purser

Re: pic: 1559 so far

Whew, looks heavy. Do you have a final weight estimate?

28-01-2006 21:49

Koko Ed

Re: pic: 1559 so far

I think there's gonna be alot of heavy robots this year.

28-01-2006 21:55

Alex Cormier

Re: pic: 1559 so far

wowzer, the first thing i notice is that sheet of meatl. looks like the metal i picked out for our frame last year, is that a honeycomb light weight metal? Ya got a turret, which looks sweet, ya shooting from a low area of the robot? 2WD, with the trannies far away form the wheels, why's that? Looks great guys and i can't wait to see ya'll at FLR.

28-01-2006 22:10

bradleym1559

Re: pic: 1559 so far

As a mentor I'm not quite sure if the tranny design is finalized yet. Right now the team is trying to see if the design will work first of all. We tried this out last year and had to change it so I wouldn't be surprised if we end up going 4wd, but don't quote me. For this game 4wd--maybe with omniwheels on one set--would make sense.
I forgot what the board is called but its really light with corrugated plastic in between to thin sheets of aluminum...light but incredibly strong.
Weightwise she's not so bad right yet, but it will definitely get heavier. This is just the beginning.
The actual shooting mechanism will be mounted on top of the turret, hopefully coupled to the camera (camera should actually be mounted TO the turret). It should sit just on top of what you see now.
It should all be put together by next Saturday. That is, if all the parts come in. Thanks for the feedback, everyone!

28-01-2006 22:14

Alex Cormier

Re: pic: 1559 so far

so, ya guys will be able to load and pick up from the ground?

28-01-2006 22:16

bradleym1559

Re: pic: 1559 so far

Yup, underneath it will have a belt drive from front to back and then one going up to the hopper. None of this is built yet, but its all designed and ready for production.

28-01-2006 23:44

Zach Purser

Re: pic: 1559 so far

That honeycomb aluminum looks like neat stuff. I might have to get a little and test it out. The ball casters you have, are those Spherical Wheel brand? I wanted to get some but I can't find a US supplier.

29-01-2006 08:34

jskene

Re: pic: 1559 so far

Can you tell us where you bought the composite aluminum laminate?

29-01-2006 11:23

bradleym1559

Re: pic: 1559 so far

The composite aluminum and aluminum extrusion on the turret is from MiniTec Framing , a company right down the road from the high school in Victor, NY. That stuff is awesome, and they give reasonable prices fo FIRST teams...it still isn't real cheap though. The casters came form a huge magazine...i forgot the name of it but if i heard it I'd know. Sorry, its been a year.

29-01-2006 13:08

JVN

Re: pic: 1559 so far

Looks great. 1559 had a solid robot last year, I can't wait to see your newest creation at FLR 2006.

If you guys put the driven wheels on the same side as the ball-intake, it will make it easier for the driver to control. (Typically, dragging the casters behind is a more stable configuration than pushing them out front. Try it if you don't believe me.) Plus in this manner, the robot would pivot about the ball intake, making it WAY easier to maneuver around sucking up loose balls on the field.

Also,
Not to nit-pick... but the COTS ball-casters from last year ARE legal; the custom aluminum plates fabricated out of Kitbot pieces are NOT. In accordance with the rules, you will need to make new versions of those plates for 2006.

-JV

29-01-2006 13:58

Billfred

Re: pic: 1559 so far

Really? Last year 1293 ran a caster in the back, which made it a bona fide pain in the neck to drive forward. (Unique experience. Your robot may be more or less of a pain in the neck. Offer void inside and outside of the 48 contiguous states.) Of course, the pivoting concept makes good sense at the same time. I guess there's only one way to find out which way is the way to go.

Either way, it looks good!

29-01-2006 14:12

Zach Purser

Re: pic: 1559 so far

Generally speaking you want your drive wheels on the front and you want your center of gravity to be a lot closer to the drive wheels than the casters. We made the mistake of having the center of gravity in the center of the robot one year and everytime we made a sharp turn the robot would fishtail (I think we corrected by moving the battery mount a little further forward). The ball casters will make driving easier because you don't have to overcome the swivel bias that you have with the swivel casters. We used sliders last year to avoid this problem and I was suprised how well they worked.

29-01-2006 16:21

Starke

Re: pic: 1559 so far

matt bradley, your team always impresses me with what you come up with. a turret i presume? keep up the good work and maybe ill see you some time this year.

29-01-2006 22:10

phrontist

Re: pic: 1559 so far

I'm curious... is your turret gravity loaded or loaded from the bottom? How many axises does it rotate in? Are you planning on shooting in the low goal, and if not, why shoot from a low position?

Looks good, wish we were as far!

30-01-2006 13:04

bradleym1559

Re: pic: 1559 so far

Thanks a lot for the input everybody! I will get this back to the team to work on. Thanks again!

30-01-2006 17:43

Zach Purser

Re: pic: 1559 so far

For anyone interested in the casters:
http://www.outwatercatalogs.com/outw...398&catalog=ow

30-01-2006 18:04

Murf the Smurf

Re: pic: 1559 so far

I love the turret idea

yours looks allot like ours but I was curious how you were going to mount and program your cam

we aren't sure whether to put it on the turret itself or mount it separately on the bot

30-01-2006 20:25

bradleym1559

Re: pic: 1559 so far

As far as i know they were going to mount the camera directly to the cannon, so where the camera focuses is where the cannon shoots. Kind of simplifies the whole system. Right Now they are still working on perfecting the camera's focusing on the green. The idea is that, like with the camera mount they gave us, it will pan for the green, but through the other motors controlling the pitch of the turret and the horizontal angle. They are going to use the window motors to turn the turret and change the pitch. they said that this way they wouldnt need constant feedback from the motors as to where they are as they would just be following the green at all times. I could be wrong. Don't quote me, I'm a lower mechanical mentor. Hopefully it will work. Sounded good to me.

30-01-2006 22:26

Alekat

Re: pic: 1559 so far

Are you planning on making it up the ramp?

31-01-2006 11:37

bradleym1559

Re: pic: 1559 so far

Supposedly it can climb the ramp right now, but with all the weight on it I'm not sure this design will suffice. Personally, I'm not too sure that casters are conducive to hill-climbing, so they might end up changing it to 4wd in the future. I suggested the large wheels in the front and omniwheels in the back for best traction.

31-01-2006 20:57

krADLEY

Re: pic: 1559 so far

Thanks for letting us know the aluminum plates were illegal, that was a lot of help.

31-01-2006 20:59

krADLEY

Re: pic: 1559 so far

I watched the robot go up the ramp today with no weight. It gathers pretty good speed and can make it up no problem, the caster however reduce the mobility once on the ramp.

31-01-2006 22:04

Alekat

Re: pic: 1559 so far

I can imagine that it would be hard to "make room" for allies on the ramp, but I don't think it's a big concern. It would just take a bit of planning ahead in some strategies.