Winnovation Midwest Coast Drive

[RookieWookiez]

http://www.chiefdelphi.com/forums/sh...ad.php?t=70473. This desgn of an 08 west coast bot looks very similar to ur design.

[BrendanB]

Originally Posted by RookieWookiez

http://www.chiefdelphi.com/forums/sh...ad.php?t=70473. This desgn of an 08 west coast bot looks very similar to ur design.

West Coast Drives are very similar and extremely popular in the past few years, but every design is different in some way or another as teams and individuals eliminate different components to save weight and increase performance. And they don't look half bad either!

Team 254 and 968 are most famous for their West Coast Drives over the years. http://www.chiefdelphi.com/media/photos/31597

[Aren_Hill]

Originally Posted by RookieWookiez

http://www.chiefdelphi.com/forums/sh...ad.php?t=70473. This desgn of an 08 west coast bot looks very similar to ur design.

If you spend about 5min on delphi i bet you can find alot of pictures of 6wd bases.

Ours is actually very different in the details than the one you picked, but draws lots of things from that overall style of drive.

We chose the popular criteria of 6 wheels with the center being direct driven. And having the wheels cantilevered and the frame to match.

We drew inspiration from the very proven drivetrains of 60/254/968 and added/changed things as we wished.

[RookieWookiez]

I'm just simple stating a point. Nice open design with a low profile.

[RookieWookiez]

Our team is currently looking a making new gear boxes similar to yours, I was wondering if u could or anyone eles could help describe to me how they work. I understand the concepts behind the shifting but I don't know what a dog gear does, or even if it's needed. Any help would be wonderful, thanks.

[AdamHeard]

Originally Posted by RookieWookiez

Our team is currently looking a making new gear boxes similar to yours, I was wondering if u could or anyone eles could help describe to me how they work. I understand the concepts behind the shifting but I don't know what a dog gear does, or even if it's needed. Any help would be wonderful, thanks.

I'd download the CAD models that AndyMark has posted on their site.

If you examine the models, you can see that the output shaft has a pair of gears on it, on bearings so that they are not torsionally attached to the shaft. Between these two gears is the "dog" that is torsionally attached via a hex shaped shaft. The dog has a tooth/shape pattern on it which matches a similar pattern in each gear. When the dog is pushed against a gear, they interlock, and that gear is then able to transfer torque to the shaft. The two different gears are different sizes with different ratios, so by changing which is engaged you change your reduction (and neutral would be the space between).

[JesseK]

Originally Posted by AdamHeard

I'd download the CAD models that AndyMark has posted on their site.

To avoid confusion, the specific model Adam refers to is the AM Gen1 or AM Gen2 shifter; the AM SuperShifter has the dog gear on an additional intermediary shaft instead of the output shaft.

[Mike Schreiber]

Kind of curious with the post of this thread, how is this development coming along.

How is the belt routed inside the tube? Is it possible to get a picture similar to the one posted in the thread above?

Is the belt lasting? How long does it take to replace a belt?

[Carrington]

Originally Posted by ICanCountTo19

Kind of curious with the post of this thread, how is this development coming along.

How is the belt routed inside the tube? Is it possible to get a picture similar to the one posted in the thread above?

Is the belt lasting? How long does it take to replace a belt?

As far as durability goes the belts have shown no signs of wear or anything to be concerned about, and we haven't had to adjust tension at all since the first time we tensioned the belts.

We haven't had to replace a belt yet, but we are currently looking into several different methods to make replacement fast.

[M. Mellott]

I really like the unique layout of your transmission and the compact setup. You mentioned that you use "shortened body pancake cylinders for the shifters within the gearbox". Just curious...are these cylinders legal in an FRC competition robot?

[techtiger1]

To the Winnovation guys regarding the hex broach through the UHMW wheels.1251 has a lot of R&D into UHMW material espeically regarding using them as wheels, see our 2007 robot. I can tell you the hex will not last especially playing as many matches as you guys do during a season. My suggestion is developing another keying method, bolting on alumnium hex hub adapters or just making the wheels out of alumnium. Also, avoid pressing things such as bearings or hubs into the UHMW in drive applications as the material is oil impregnated which makes doing something like that difficult, it is doable but on something that needs to be as reliable with as much torque as a drive system I don't recommed it. Overall the design is nice and clean looks like something great to build on. Good luck in 2011.

-Drew D.

[Aren_Hill]

Drew,

The UMHW wheels were from the perspective of "oh hey we need wheels but don't want to spend any significant amount of money on stock" so UMHW was the cheap route taken for the prototype. During the season they would definitely be aluminum, thanks for the warnings we'll be careful using it elsewhere.

M. Mellot,

The pneumatics rules these past two years have relaxed quite a bit (as opposed to other sections of the manual )
The basic requirements for pistons include,
being rated for >125psi and
"Cylinders may be of any configuration, and may be of any size up to a maximum of 24-inch stroke and 2-inch diameter."

So we're taking advantage of that rule to use a easier to integrate form factor, after all who doesn't like pancakes.

[AdamHeard]

Originally Posted by Aren_Hill

Drew,

The UMHW wheels were from the perspective of "oh hey we need wheels but don't want to spend any significant amount of money on stock" so UMHW was the cheap route taken for the prototype. During the season they would definitely be aluminum, thanks for the warnings we'll be careful using it elsewhere.

M. Mellot,

The pneumatics rules these past two years have relaxed quite a bit (as opposed to other sections of the manual )
The basic requirements for pistons include,
being rated for >125psi and
"Cylinders may be of any configuration, and may be of any size up to a maximum of 24-inch stroke and 2-inch diameter."

So we're taking advantage of that rule to use a easier to integrate form factor, after all who doesn't like pancakes.

254 and us legally used 3 position versions of the same cylinders this year, 1625 is in the clear here.