pic: 1305 Frame design with trannies

[CD47-Bot]

loading photo ...

[Tytus Gerrish]

ah, baker transmitions with a box tube frame. OHH! and whats this? sinking the drill motor into the box tube. Somone stole my idea, Or mabye its a good idea and you came up with it too?

[Hunter]

They are a completely new trannsmission That I designed. Although I was definetly heavily influenced by Baker's design. It is designed to have Brecoflex tracks in the gap between the The 2x4s and the outsice plates, So the driveshaft out of the Trannies is designed to turn the back drive pulley for the tracks. The trannies are 2 speed with approxiamte speeds (70% of free speed) at 3.4 ft/sec and 9.5 ft/sec. Kinda slow compared to other designs but This is designed like a bulldozer.

[Hunter]

I know the drill motors are cancelled but this was designed before then, and besides, it would take only a very small effort to convert the trannsmissions to use any other similar motor. And I'm hoping we get the Dewalt drill motors, they would swap in easily.

[Arefin Bari]

How much do the transmissions weight... just a suggestion... make sure the robot weight is balanced... our 2003 robot was back heavy since the transmission was in the back like your design... but i think we only flipped once... the overall design looks great... the frame looks strong... you might have to change your transmission depending on what motors they give us this coming season... good luck...

p.s. Never mind my changing tranny comment... i think you just click submit just a second before i did...

[sanddrag]

What is the thickness on the outer plates and on the wall of the tube. I'm guessing it is 1/8" If so, the plate needs standoffs between it and the tube, and the tube needs some serious HOLES. Also, other than mounting your trannies? is there any reason that tube is so big, I mean, for the rest of the way down the frame?

[Hunter]

The trannies wheigh 9.3 pounds With everything on them you see there (according to inventor anyway). We still have to build them, we are waiting for gears. So they might not even work, but thats why we are building them now.

[Hunter]

Originally Posted by sanddrag

What is the thickness on the outer plates and on the wall of the tube. I'm guessing it is 1/8" If so, the plate needs standoffs between it and the tube, and the tube needs some serious HOLES. Also, other than mounting your trannies? is there any reason that tube is so big, I mean, for the rest of the way down the frame?

Like I said before it designed to fill the bulldozer role on the field. Those are the 2x4x1/8 tubes like we got in the kit last year, and the outside plates are 3/16. there will be standoffs as part of the track system, but I didn't add them in yet. both the 2x4's and the outside plates will likely end up full of holes in the final robot (If it turns out that we can even use this design next year), then we will just Epoxy a piece of 1/16 lexan over the holes on the outside plates to keep stuff from getting caught in them (bad experience in atlanta with stuff catching in holes).

If we end up building this we will deside where mechanisms need to be mounted before drilling any lightening holes to make it easy to mount stuff.

By the way the bottom plate is only 1/16, just to help keep the frame square and mount stuff like the battery and electronics to.

[sanddrag]

3/16" looks like a good choice for those plates. I know your not anywhere near this point, but if you could get EVERYTHING laid out in Inventor (like early in the build) then you could get some really (big) nicely lasercut or waterjetted holes in those tubes and plates. As for the bottom pan, you could probably go with a little bit thinner even and then roll some beads in it (or get it embossed) and it will really stiffen it up and look cool too.

[Justin Boudreau]

Haha, unfortunatly laser or watercutting isn't an option for us. It would be nice, but we'll be lucky to afford the gears.

[Travis Covington]

Originally Posted by Justin Boudreau

Haha, unfortunatly laser or watercutting isn't an option for us. It would be nice, but we'll be lucky to afford the gears.

It never hurts to ask. The worst they can say is no, or tell you a price. Alot of businesses will openly donate services to teams, but they will never know you want their help unless you ask.

[K.Shaw]

all i have to say is if those drill motors die or crap out its gunna b a pain in the $@#$@#$@# to changed them.....cool design though

[J Flex 188]

looks pretty awesome guys.. by bulldozer.. i wonder how what the torque stats are . we can keep up a canadian way of being able to push everyone around, just not in real life .

i hear you about the waterjetting *sigh*

[Paul H]

Originally Posted by Arefin Bari

... just a suggestion... make sure the robot weight is balanced...

Just put the battery in the front.

[Hunter]

The Drill motors actually come out quite easy, just a couple of set screws that Protrude into the holes in them and some gental taps and they should come right out all the way through the 2x4.

As for tourque, it has approximatley 31.5 theortical ft/lbs of tourque at 40 A per side in low gear, giving it pushing theoretical pushing force of 378 pounds at 40 A not taking any friction etc. into account. That is about 1100 pounds of push at stall in low gear, Which is impossible to reach since the battery can't provide that kind of current. Combine that with VERY grippy tracks and we should be somewhat of a bulldsozer out there, with good intentions of course.