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Unread 15-12-2008, 15:00
Andrew Schreiber Andrew Schreiber is offline
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Re: Diffrent Transmission Advantages

Quote:
Originally Posted by Tom Line View Post
Dewalt: Very small and lightweight package, due to the cyclic geartrain. However, said geartrain incurrs higher efficiency losses that a simple spur-gear setup.

Rush managed to run two cims through a single Dewalt last year, as have several other teams. I believe they ended up not shifting them, however. They can comment on this if they see it.

Andymark is easier. There is no machining. If you want to make it lighter, you can. It is reasonably bulletproof. The only real drawback is that you need a pneumatic system to shift well, and that adds additional weight.

Banebots make some excellent transmisisons. But it's very seldom I see them used for a drive system.

Many teams Opt for the Andymark tranny, then machine out the gears, and remove the spacer plate and use 4 aluminum / delrin spacer cylinders instead. This lightens it up considerably without touching the durability and is an operation that anyone with a hand drill can perform.

In addition, unlike the dewalts, if you DON'T modify the supershifters components, you can use them year to year. Because the dewalts are not COTS components, people generally end up dropping them because of the hassle of machining them year to year.

That's why so many folks like Andymark.

A final note - if you only need a single cim for your application, then dewalt's are the way to go. The andymark's are built to handle 2 cims, and 2 cims worth or torque: they are more than twice as heavy as they need to be. In this case, the dewalt looks like the better choice.
RUSH did indeed shift last year. Also, many may recall their drivetrain problems, these were NOT caused by the Dewalts, to my knowledge in the last 4 years using dewalts in their drive train they have never blown one. This includes the time when a servo wasn't shifting one all the way into gear and we had it kick into gear. (This was fixed as soon as we found it)


AndyMark's Toughboxes were what 397 used this year. Literally set it and forget it. Never once did we have to muck around with them. Our drive train was rock solid using them.

Also, custom gearboxes are nice if you absolutely need them. I have found most teams don't have the capability to improve upon off the shelf solutions. Some teams do, but for me, the only mods I will be doing on a gearbox anytime soon MIGHT be integrating it straight into the chassis side rails.
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