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Unread 10-08-2016, 17:45
Max Boord Max Boord is offline
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FRC #0179 (The Children of The Swamp), FRC #1592 (Bionic Tigers)
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Re: pic: Its twins - prototype drives

Quote:
Originally Posted by joeweber View Post
Far as efficiency loss, I am not concerned, its small and our mechanisms are geared correctly with low power use so if we have loss at the match it will be over before it is a problem. We will just recharge the battery a little more.
What are they geared to? low power use isnt just gearing. its efficiency and right angle gears are less efficient than spur gears like those found in conventional drivetrains. Size also has no meaningful effect on mechanical efficiency. Also are you saying overcharging the battery is a solution to pour mechanical design? i think what people are point out is that your drivetrain will push less hard, accelerate slower and reach a lower top speed as a result of the bevel gear stage.

Quote:
Originally Posted by joeweber View Post
Between the front wheels, center and rear wheels their is a difference of .375 inch. The side plates are 3/16 thick. We do plan on cutting the bolts shorter or go with aluminum with C clips but we have had problems with the C clips coming off. The chain wrap is a problem, but we do not plan on using the center 4 inch wheels on future designs. We wanted to put double sprockets on that wheel but we only have 2 inches between the side plates and the chains barely clear now. One unit weighs 20 pounds.
.375 inch wheel drop is very aggressive even for a game like this years. .125 to .188 is pretty much standard.

Quote:
Originally Posted by joeweber View Post
The chain wrap is a problem, but we do not plan on using the center 4 inch wheels on future designs.
So are you guys planning on running 6 inch wheels 4WD or some other configuration? 4WD is generally a bad idea in FRC and is inferior to a 6 or 8 wheel drive with 4 inch wheels for numerous reasons.

What exactly are you guys trying to get out of this drivetrain that could not be done with a standard 4 or 6 cim versa drive or even a kitbot? This is a 50lb drivetrain while people have made 25-35lb drivetrains out of 2x1 tube for years now. They are simpler, cheaper, have less custom parts, are stronger, easier to assemble and maintain, have more reliability can push harder, accelerate quicker, and weigh 20-50% less than this. the only advantage I see in this is that it gets the Cims out of the way and frees up some bellypan space. if thats your sole goal then i highly recomend checking out designs for gearboxes that put the cims over the top of the drive wheels. its a simpler and more proven concept than this and has many more upsides with none of the downsides i listed in this post.
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