Crazy Drive Train Ideas

[theprgramerdude]

With high gear reductions and large wheels instead of small wheels and low reductions?

Turbo-fan powered drive?

[Bjenks548]

Originally Posted by Katie_UPS

I always wanted to see a big-wheel robot.

How big of wheels? we had 12" this year and i think 107(maybe a different team I'm going off memory) had the same ones too.

[theprgramerdude]

Originally Posted by JamesCH95

With 130+lbs on the screws good luck not damaging the carpet from driving or getting pushed around.

Pushed on a screw drive? Bahahahahahahahahahahaha

[davidthefat]

Legs with legs


Nuff said

Here is a picture of it:

[Mageofdancingdr]

Train drive, with pneumatics.

hook up pneumatic pistons to crankshafts and as the pistons go in and out they create torque on the axel. most powerful drive system ever.

[DinerKid]

Originally Posted by Mageofdancingdr

Train drive, with pneumatics.

hook up pneumatic pistons to crankshafts and as the pistons go in and out they create torque on the axel. most powerful drive system ever.

It has been done with Vex a few times. The issue is that the system eats air like crazy.

http://www.vexforum.com/showthread.p...eumatic+engine

~DK

[JamesCH95]

Originally Posted by Mageofdancingdr

Train drive, with pneumatics.

hook up pneumatic pistons to crankshafts and as the pistons go in and out they create torque on the axel. most powerful drive system ever.

The compressor is just about the least powerful motor in the KOP, so that drivetrain will be about the least powerful. It could have high pushing force though.

[Jared Russell]

Originally Posted by Bjenks548

How big of wheels? we had 12" this year and i think 107(maybe a different team I'm going off memory) had the same ones too.

You should see 522

[Aren_Hill]

One of Mr Pat Fairbanks pictures from 08

[Trent B]

Originally Posted by JamesCH95

The compressor is just about the least powerful motor in the KOP, so that drivetrain will be about the least powerful. It could have high pushing force though.

Gotta love semantics.

It would probably have the most pushing force, most powerful over the time period where there is enough air in tanks. Over the whole match probably the weakest.

[Jared Russell]

FRC rules have traditionally allowed energy to come from 4 sources:

-Battery
-Stored air
-Stored gravitational potential energy
-Deformation of robot parts

The fourth one could make for an interesting drive system (a "wind up toy"). Albeit one that would take a lot of engineering to make safe enough - yet powerful enough - to be useful.

[JamesCH95]

Originally Posted by Trent B

Gotta love semantics.

It would probably have the most pushing force, most powerful over the time period where there is enough air in tanks. Over the whole match probably the weakest.

Hehe, I suppose it is a little semantic, but there is a lot to be said for using precise and correct language, especially in the field of engineering.

[AdamHeard]

Originally Posted by Trent B

Gotta love semantics.

It would probably have the most pushing force, most powerful over the time period where there is enough air in tanks. Over the whole match probably the weakest.

I'd argue pushing force is completely independent and unrelated to the power source.

[EricH]

Possible pushing force might be unrelated, as there is only so much traction available from a given set of wheels.

Given a non-traction-limited drivetrain, however, where you get the power from can make a big difference. For a pneumatic drivetrain, if you can't keep the tanks full, you'll lose pressure quickly. The compressor would probably have a hard time keeping up with pressure loss in that case. But a motor-driven drivetrain does not have that problem, at least until the battery dies.

[JamesCH95]

^ exactly like that EricH said, the total integral work possible (not including mechanical inefficiencies) using the compressor for a whole match is 10.1kJ, whereas running 1 cim motor at full power for the whole match is 47.3kJ. So one CIM motor is nearly 5 times as powerful, and with proper gearing can deliver the same pushing force as pneumatics would.

What this says is that you need a compressor powered by several CIM motors