11-02-2004 22:47

Specialagentjim

Re: pic: just another view

::raises hand::

If I get my bumper, you betcha!

11-02-2004 23:02

edomus

Re: pic: just another view

you buy those gearboxes?

11-02-2004 23:14

Eric Bareiss

Re: pic: just another view

Just a quick question. Why did you guys only raise the tracks on one side? Now you can only climb the step in one direction.

11-02-2004 23:29

edomus

Re: pic: just another view

I dont see a need to be able to go up both ways, just turn the bot

12-02-2004 13:44

Dan Richardson

Re: pic: just another view

:: fears the mighty 134 ::

I'd kill to see whats inside those gearboxes :-)

12-02-2004 15:07

Greg Perkins

Re: pic: just another view

hehehehe...shhh no killing today


mmk just to give some answers to some questions....

1. they are ordered gearboxes (Boston Gear - series 700 i think) they use a coupler and attatch right on the chips.

2. we angled the treads because when the balls roll to the raised section of track it would drive up it and bottom out. also on the flat part is really good for pushing.

3. we have a young lad named RJ, who weighs about as much as a First robot sit/lay on the carpet floor in the Library(same stuff as the field) and this thing w.out a problem shoved him across it (left a bad rug burn on a bad spot), and on a side note, the batteries were dead; running at about 7.5vts. this things got some powa'.

4. we also are able to drive up onto the ramp w/ no problem. we can also drive up a 90degree incline


keep the questions coming...i love to get some feedback

12-02-2004 15:24

NoRemorse

Re: pic: just another view

when i first erad this, i thought it was a typo, but your robot must be able to hang i guess

12-02-2004 15:48

Joe J.

Re: pic: just another view

I see two CIM motors. Are the Drill motors in there somewhere?

12-02-2004 21:07

Greg Perkins

Re: pic: just another view

negative, only the chiaphuas

12-02-2004 22:12

Pat Roche

Re: pic: just another view

Some more specs on the gearboxes.. they are the from boston gears...im not sure which series.

They were designed specifically for high rpm motors. Its a simple worm gear inside a cast iron box (no going through plastic housings this year). We run the chips in and then gear it down to the track.

One of the reasons we decided to angle in one direction only is due to the tipping factor while going up the 6" step. Greg was correct to say that this thing has power....it dragged me and the mentor across the library rug with a slightly lower ratio.

keep on askin

-Pat

13-02-2004 10:58

Stu Bloom

Re: pic: just another view

It sure looks like a powerful robot ... But I'm not sure power is that important this year ... got anything else??

Also, how much does that beast weigh ?

13-02-2004 11:54

JVN

Re: pic: just another view

I'm curious what the coefficient of friction of an 'RJ' is... because otherwise... your previous statement is meaningless. Was RJ coated in teflon? Can we borrow RJ for comparison? How many RJ's is enough this season?

Everyone: Try to keep your pushing force estimates quantitative. Many of us use these units called "pounds". Break out the spring scale.

She looks great.
I can't wait to see it in person.

John

PS - Those brecoflex tracks probably have a coeff. of about 1.5-1.6 With a 130lb normal force this means you can push with a linear force of about 208lbs. No matter how geared down those chips are, you can't push any more than this. But, the big question is... did you gear them down enough?

I guess RJ's frictional force is less than 1.6! Poor RJ...