23-01-2007 13:11

AdamHeard

Re: pic: This is our robot as of last night. Alot more should get done this week now

That's like a huge diameter tube to use on the arm. Is that the final stage or is there going to be more after that?

It seems like if there was more, the window motor probably can't handle the load very quickly.

23-01-2007 13:13

Alex Cormier

Re: pic: This is our robot as of last night. Alot more should get done this week now

tracks or 4wd?

23-01-2007 13:19

Ben Piecuch

Re: pic: This is our robot as of last night. Alot more should get done this week now

I spy a Colson wheel in the background, so I'm assuming it's a 4wd w/ colsons.

Looks very nice and clean. I too am wondering about that massive bazooka tube for an arm. As it sits right now, it can't reach the floor, so I'm guessing that it either telescopes or has a wrist that's yet to be added.

I guess your electrical guys are pretty quick. They need their cables fed at 400rpm!

BEN

23-01-2007 13:20

dfukuba

Re: pic: This is our robot as of last night. Alot more should get done this week now

The Tube is 3" diameter .125" wall. A bit overkill but after the cheesing it only weights 3lbs. There will be a grabber on the end of the tube.

We tested out the window motors and they will me powerful enough to run the arm. We will have one more added on the other side, and it will be geared down a little bit. And because there is no back dive, it helps with moving the arm.

--Dan

23-01-2007 15:24

Kevin Sevcik

Re: pic: This is our robot as of last night. Alot more should get done this week now

He said 6WD. I'm hoping there's another border piece on the exposed side to support the other side of the tranny shaft. Otherwise.... ick. Seeing a shaft loaded like that seriously distresses me.

23-01-2007 15:45

Wetzel

Re: pic: This is our robot as of last night. Alot more should get done this week now

It looks like there are mounting holes on either end of the robot for another piece outside the shaft.

Wetzel

23-01-2007 16:47

Nuttyman54

Re: pic: This is our robot as of last night. Alot more should get done this week now

unless they've changed the outside (which is entirely possible) this post of their CAD earlier seems to show that it is indeed supported on both sides

23-01-2007 17:59

Scion13

Re: pic: This is our robot as of last night. Alot more should get done this week now

How what weight class is your robot in? Can it reach the top spider?
Looks good man.

23-01-2007 18:52

Choi9111

Re: pic: This is our robot as of last night. Alot more should get done this week now

Sweet! what weight class is ur robot?

23-01-2007 20:42

Guy Davidson

Re: pic: This is our robot as of last night. Alot more should get done this week now

As of right now, it fits in the 120lbs / 4ft class. It's supposed to be able to reach the top goal, but we won't know until we build the grabber onto its end.

There will be a bracket mounted on the outside of the wheels, and there will be a lowered middle wheel. The general design is the same, but the grabber looks different. Functionaly it's supposed to be the same though.

-Guy

23-01-2007 23:44

=Martin=Taylor=

Re: pic: This is our robot as of last night. Alot more should get done this week now

I'm not sure I understand how that will fit in the 72" limit. If your arm is 50" long and the bot is 38" then you will be 88" in total (of course I'm just guessing).

24-01-2007 01:51

Guy Davidson

Re: pic: This is our robot as of last night. Alot more should get done this week now

The rule states that the robot must fit inside the 72"x72" box. It also states the orientation doesn't matter. Now, if you put the robot on the diagonal of that box, with the two corners touching the sides of the box, and the arm extended all the way out, it is about 45" long from where it breaks the plane of the robot. That fits inside the box. For more info, check the thread about R12 in the Rules and Strategy forum.

-Guy

24-01-2007 02:44

foundbobby

Re: pic: This is our robot as of last night. Alot more should get done this week now

Are those the banebot transmissions?

How efficient have you guys determined they are?

24-01-2007 08:02

mike1062

Re: pic: This is our robot as of last night. Alot more should get done this week now

kool about how much longer do u think it will be tell u get done

24-01-2007 12:17

dfukuba

Re: pic: This is our robot as of last night. Alot more should get done this week now

Yes these are banebot transmissions. I did not run the robot yet, but i am confident that they will run just well. I will let you know how well they work as soon as i get parts to finish the robot.

24-01-2007 12:27

dfukuba

Re: pic: This is our robot as of last night. Alot more should get done this week now

We had planned to get the entire drivetrain done after the second week of build, but because of a mix up when order parts from mcmaster, we much make another order and wait until they come in. I will post pics when we get this done.

24-01-2007 12:30

dfukuba

Re: pic: This is our robot as of last night. Alot more should get done this week now

I plan to have a plate on the end, but did not plan to support the ends of the shafts. This was something that had also been bugging me for a while. I am thinking about making some kind of pillow block which will mount on to the side plate.

My original idea was to put the wheels as close to the gearboxes as i could so that most of the load would be on the bearings and not the shaft. Because i had never tried this before i was unsure how it would turn out.

--Daniel

24-01-2007 13:11

Jaine Perotti

Re: pic: This is our robot as of last night. Alot more should get done this week now

That would only be if the arm were sticking straight up in the air. Most likely, the arm will be at an angle when deployed, reducing its height off the ground.

For example, at a 30 degree angle, the arm would only add 25" to the 38" height you mentioned. This team is probably within the rules.

24-01-2007 17:04

dancingfool

Re: pic: This is our robot as of last night. Alot more should get done this week now

Wow! That looks really good!

Good luck

24-01-2007 17:30

jgannon

Re: pic: This is our robot as of last night. Alot more should get done this week now

Remember, the 72" limit is within the plane parallel to the floor, not the height. In any case, you're right that it's only a problem if your arm is straight out. I did some trig here that indicates that a widthless arm would be allowed to protrude up to 49.8 inches, minus rear bumpers, from the front of your robot. (Though that thread was speculative, my interpretation was upheld by the Q&A.) So, as long as they don't have their arm straight out while fully extended, they should be perfect.

25-01-2007 01:11

=Martin=Taylor=

Re: pic: This is our robot as of last night. Alot more should get done this week now

We did some tests with our 5lb. grabber on the end of an arm aprox. the same length as this.

One keyang motor was not able to lift it. After adding a spring, which took virtually all the load off the motor, the keyang could lift it with ease.

However, even without a load on the motor, a light tap on the end of the arm was capable of stripping the gear inside the keyang. Further investigation found that the plastic gears inside these motors have very small teeth and are easily damaged.

Just a warning...

25-01-2007 01:33

AdamHeard

Re: pic: This is our robot as of last night. Alot more should get done this week now

The keyang motors aren't that powerful when compared to the others in the kit.

A FP motor (or the BB RS540, which has less power) into the 256:1 42mm gearboxes from Banebots make an easy to integrate motor with lots of torque.

Or take a hint from 968/254 (60 too maybe?) and swap you FPs into the drive to free up two small CIMs to use on the arm.

25-01-2007 01:42

=Martin=Taylor=

Re: pic: This is our robot as of last night. Alot more should get done this week now

Yeah I forgot to metion that we had a reduction off the keyang...

Unless you can make a worm gearbox FPs and CIMs are backdrivable.

25-01-2007 01:47

AustinSchuh

Re: pic: This is our robot as of last night. Alot more should get done this week now

I specifically remember 254's driver telling me after last year that they were NEVER going to use the FPs in the drive train again. The FPs caused them too much trouble.

25-01-2007 02:05

AdamHeard

Re: pic: This is our robot as of last night. Alot more should get done this week now

You're completely right. I remember 968 telling me the same thing...

Too many hours of robotics and too little sleep causes me to forget things....

25-01-2007 12:20

dfukuba

Re: pic: This is our robot as of last night. Alot more should get done this week now

I did not know that the gears were plastic. We will be using two of these on each side, with about a 1.75:1 reduction. I am hoping that this will be enough, in initial testing it seemed like it would work. But if we run into any big problems i may try to figure out a way to use the big Cim motors. Or get a gearbox for the FP motors. because it seems like we are so far ahead then we have been before, we will see if we can rebuild the whole superstructure after some real life testing.

Thank you for the heads up
--Dan

25-01-2007 12:45

Lil' Lavery

Re: pic: This is our robot as of last night. Alot more should get done this week now

The 49.8 inches is assuming that your arm has no width to it. The wider your arm is, the shorter it can extend without breaking the 72" x 72" box.

25-01-2007 13:14

chaoticprout

Re: pic: This is our robot as of last night. Alot more should get done this week now

Well, firstly' the 49" is NOT taking bumpers in to account, and as lil lavery said, you have to take the width of the end of the arm into account.