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-   -   Crazy Drive Train Ideas (http://www.chiefdelphi.com/forums/showthread.php?t=86059)

theprgramerdude 13-09-2010 20:27

Re: Crazy Drive Train Ideas
 
With high gear reductions and large wheels instead of small wheels and low reductions?

Turbo-fan powered drive?

Bjenks548 13-09-2010 20:36

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by Katie_UPS (Post 974085)
I always wanted to see a big-wheel robot. :P

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 13-09-2010 20:37

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by JamesCH95 (Post 967935)
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 13-09-2010 21:57

Re: Crazy Drive Train Ideas
 
Legs with legs


Nuff said

Here is a picture of it:


Mageofdancingdr 14-09-2010 02:55

Re: Crazy Drive Train Ideas
 
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 14-09-2010 06:45

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by Mageofdancingdr (Post 974108)
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 14-09-2010 08:35

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by Mageofdancingdr (Post 974108)
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 14-09-2010 19:52

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by Bjenks548 (Post 974089)
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 14-09-2010 20:11

Re: Crazy Drive Train Ideas
 


One of Mr Pat Fairbanks pictures from 08

Trent B 14-09-2010 21:51

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by JamesCH95 (Post 974124)
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 15-09-2010 07:14

Re: Crazy Drive Train Ideas
 
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 15-09-2010 09:47

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by Trent B (Post 974180)
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 15-09-2010 15:09

Re: Crazy Drive Train Ideas
 
Quote:

Originally Posted by Trent B (Post 974180)
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 15-09-2010 15:24

Re: Crazy Drive Train Ideas
 
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 15-09-2010 15:38

Re: Crazy Drive Train Ideas
 
^ 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 :p


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