Hints for Ken Leung
 

Our estimated finished weight will be between 110lbs to 115 lbs.

Check back in two days for hint #2

Shawn
Team 60

Wow, that's 15lbs less than what I expected.... Interesting....

I can't wait to see the whole robot! If you can, please post in the same thread.

No problem. You will need to go the gallery for some of the other clues.

Clue #2
 

Ken

Go to the gallery and you can see a couple of pictures of our gear box in a semi complete form. What do you think?

http://www.chiefdelphi.com/forums/pi...DESC&sort=date

Shawn
60

ps In a couple of days I will post a completed gear box.

So far, pretty good :). One semi complete transmission done on the 19th. Not bad at all. Just need at most 1 more week to finish this one.

Let's see, I like the shape, it save lots of weight by cutting away the corners... Ah, 2 place for motors to screw in, so its a transmission for two motors... Probably just one side of the robot, so your robot will have 4 motors for the drive system huh?

On to the next picture... The sprocket on the most right is the last stage of the gear box, connecting to a shaft transmitting power to the wheels. The middle 2 gear is the 2 speed sprocket, each level representing one individual gear ratio....

The shaft next to it is where the magic happen. By sliding that shaft with 3 gears on it, you engage one set of gear at a time. The middle gear with the top gear on the right, or the bottom gear with the bottom gear on the right. On the other end of this shaft is where the motors get connected to.

The shaft slightly behind all three of the others is where the 2nd motor connect to. It connect with the left most shaft on the top gear, and transmit power from the second motor to that shaft by meshing the teeth on the top gear. Not sure if you want to, but I bet it can leave that shaft alone by using the pneumatics to slide it off the top gear and clear the rest of the transmission.

Pretty nice gear box this year :). Just make sure its completed.

Hmmm it looks as if there are 2 pneumatic actuators on the gearbox? NO?

the only 2 reasons in think there are 2 pneumatic actuators in the picture are A) the second pneumatic actuator is just being held up by there for reasons of not wanting to pu it down? B) the gearbox utilizez 2 actuator in which case i would assume its a 3 speed robot? NO?

Nope... the reason for the 2nd pneumatics is to make sure the 2nd motor stay engaged to the first shaft. The 1st pneumatic cylinder is to shift from one gear ratio to another.

Gear Box
 

Ken, Close, but not as good as last year .......
more pics to come,
Are you going to Phoenix or LA ?
Hint: 1 drive box, three boxes total.
A=bc/2
Have FUN!!!
Geo.

Not sure I will go to those regionals, but I will definitely make it to the Championship event. Show me the robot then.

And hey, I only got 2 pictures to work with, Give me some credit :P. Its looking good by the way.

You get LOTS of credit Ken, your just traped in old thinking!
you got rotten pics and got a lot of it right....
But some of it wrong too
we should be finished Friday (gear boxes are finished) and to powder-coat next week
Looking forward to TX see ya there (or sooner?)
I am missing san jose all ready
Geo.

Now...here's the thing...

If the photo shows two pneumatic pistons, they'd be allowed only a single other custom cylinder. Those are each small bore, small stroke pistons, and thus, a custom order.

As per the rules, they wouldn't be able to order the two additional pistons necessary to make a second transmission for the other side of their robot.

So, based on that, and that each plate of the gearbox is alike, I'll guess that the motors (four, probably) all attach to a single gearbox.

This, of course, requires that their robot be only 2WD, or that it be 4WD with a differential. I'd imagine it's the latter.

What is our strategy?
 

Ken...

I am going to put up the finished gear box tonight. Can you make a repeat and not only explain the gearbox but also come up with a possible strategy of our robot?

Good Luck :yikes:

Shawn

Thorughly taunting Ken...
 

Hey George!

Can't wait to see your robot, we won't see you guys up north this year but we'll visit at Nationals.

That powdercoat is a trademark now :)

I wish 247 could be underweight, but...with 2.1 pound wheels ( i'm not saying how many ) before "speed holes"....we are going to be right at that weight limit

Here you go Ken
 

Here is the final gear box.

Good Luck Ken :cool:

Shawn

http://www.chiefdelphi.com/forums/pi...DESC&sort=date

I will need at least one night to chew over this... Yup, looks like I will need the luck as well. I will figure it out sometime though.

Ok, here is a few thoughts that got me started...

First of all, assuming these are gear reductions, all the gear ratios got to slow down the speed of the motors instead of speeding them up. Looking at the specs of the motors, I think it make sense that this gear box reduce the ratio so the motors will output more torque. So, the first gear in the stage are the small ones at the bottom, and the 2 little shafts sticking out are attached to the motors instead of outputing motor power.

Then the shaft on the next stage get 1 reduction, and depending if the gear is keyed, it can be a output shaft or not. If not, then its just a support for the gear box, where the whole thing just hang on top of that bar, and the gears spin freely. but looking at the 1st picture: http://www.chiefdelphi.com/forums/pi...&quiet=verbose , there is a bearing for that shaft, meaning it actually spin instead of stationary. So that's the first output shaft right there, just really long.

Then keep going down the reductions, the small gears in the 2nd shaft is the drive gear for the top shaft #3. In the 2nd picture, I can see that the big gear on #3 is supposed to engage to it, so that means the pneumatics can at least slide the gears on #3 to mesh to the smaller gears on #2 on either position. Looking at the length of the piston on #3, I have to assume that the stroke length is more than that little gap that allow the gears on #3 to move, so the pneumaticc piston actually pops out on #3 toward the right. So that's the 2nd output shaft: the pneumatic piston that spin and extend and retract.

Then the 4th shaft on top is the final stage of the gears, and its supposed to be engaged to the #3's gears usually, looking at picture #2. http://www.chiefdelphi.com/forums/pi...&quiet=verbose

Same with output shaft 2, it is a pneumatic piston that pops out toward the right, and spin. Looking at the space inside that box, it looks like the gears on #4 doesn't touch gears on #2, and is stationary. The only way to engage them is to slide the gears on #3 to mesh with the gears on #4.


So, this probably isn't a gear box for the drive train. You can put 2 motors on it, but it won't output different speed on each side. All it's capability is spin the really long output shaft #1, and extend the pneumatic pistons while getting them to spin at the same time. The long output shaft spin the fastest, then the piston on #3 the second, and then the piston on #4 the slowest.

Anyway, that's all I can think of about this gear box. Without seeing what it outputs to, there's no telling what evil task it can do for your robot :P.

Ken:
This is our main drive transmison.

Drawing Board
 

Ken,
ITs all Scrap, best this trans would run was 3.5 sec
(it used just the two drill motors)
repeat was good (with in +/- 1.5")
new trans- 4 motors, and many long hours
See Ya
Geo.

Good luck with the robot. Hope to see a picture of the whole thing soon.

Oh yeah, by the way, I wouldn't mind getting a preview of the bot without the beautiful yellow paint all over it. Let me know if such thing can be arranged :P. Less than 2 weeks left, that means you guys have only a few days to finish it if you want a week of practice...

Sorry Ken, too late, its yellow, blue, & white as I wright
Lots of assembly pics, will bring to LA
Geo.
1 gear box, two days, no prob. no sleep, but on prob!

Ken,

I will post a couple on the gallery later tonight. I think I have some that will be interesting.

Shawn

I have put up some new pictures. I will have more in a day or two...including the NEW gear box

Looking good Shawn! I already see the red bars that lower onto the ground and lift the robot up, acting like a brake or some sort unless there's more attached on them. I bet its for the HDPE surface! Building a king of the hill robot huh? ;)

Pretty cool chain tensioner for the wheels. :)

The most interesting part is the 5th wheel... The pneumatic connected to it seems to be really really long to lower the wheels onto the ground... But even more intrestesting is the way the 5th wheel and 6th wheel (I assumed there will be one) are at an angle with the frame.

I also see some pivots on the side of your bot... For some sort of wings I suppose... ;P You guys are going to have a really huge robot!

Just a couple more things missing, like something that will mount to the plates on the frame opposite of the 5th wheel, as well as the bars pointing upward on each of the corner on the 5th wheel's side.

Hmm... Now this is just a guess of mine, but maybe you guys will be climbing over the side bars with the red bars and the 5th and 6th wheel? Well, that's just a wild guess...

Got to love the colors on your bot.

And to the topic, use the img tag. Makes it easier on all of us

you are right about some of it but they are not for the hdpe.

anyone else have a guess?

shawn

hey shawn!
 

maybe those arm are to put down at the end of the match pushing into the wiremech of the ramp on both sides while your robot is on the HDPE.

oh plus there are the wings that attach and drop down to hit the boxes in the begining.

i hope you made the hudge sturcture on your bot removable so in some matches you can go under the bar

Hey Dima!!

Niiiice Dima. Good guess.

Nope. It is on and it is there to stay. We won't be going under the bar.

Wrong!
The frame is removable, We can go under the bar.

I know George. But will we be going under the bar?

looks like we have a sumo match in cooking!

George vs. Shawn

If you guys are a king of the hill robot, and can get on the ramp faster than others all the time, you probably don't need to go under the bar.

Thanks Dima, I don't have as big of a headache now. Hmm... If there's some sort of panel attached on the red bars, it will be even better. That way when robot try to push you directly, they will ended up getting on the panel and transfer all the weight onto the red bars, and making it impossible to push you guys off. Simple, yet effective. Very cool.

What exactly is on the end of those red bars? You guys are planning on having the bars down on the mesh for the match and then raising them at the end?

Shawn mentioned something about robots being invisible, which leads me to believe that you guys will attatch something to the top white structure and then to the wings to block sight, is this close?

A very cool, durable plastic that can take a beating with a hammer. Check the new pictures

http://www.chiefdelphi.com/forums/pi...&quiet=verbose

http://www.chiefdelphi.com/forums/pi...&quiet=verbose

That's all from me. See you at Chatsworth, Phoenix, LA, and Houston.

Shawn

Before i saw that pic I thought we might have a slight chance of winning but, I think I can settle with second place. I like silver. You guys have done it again, That's an amazing robot

Going to be a pain for opponents to see anything, but will also be a pain for your alliance members to see anything if they are on trying to knock down stacks.