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Unread 09-02-2012, 10:01
Jeff 801's Avatar
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pic: Wheel

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Unread 09-02-2012, 10:03
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Re: pic: Wheel

Wow, that's an amazing machining job! Did you machine it yourself just to get the diameter to 3.5 inches? I really like how you integrated the sprocket with the wheel.
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Unread 09-02-2012, 12:35
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Re: pic: Wheel

Nice wheel Jeff.

Bryan showed me some earlier pictures of it and I'm glad to see you got it all done.
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Unread 09-02-2012, 13:12
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Re: pic: Wheel

Quote:
Originally Posted by DampRobot View Post
Wow, that's an amazing machining job! Did you machine it yourself just to get the diameter to 3.5 inches? I really like how you integrated the sprocket with the wheel.
I started with a 3.75" OD stock and Machined the sprockets as well as removed a lot of material from the other side.
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Unread 09-02-2012, 13:24
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Re: pic: Wheel

Why?

What advantages does this offer over a more common, more flexible approach?
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Unread 09-02-2012, 13:27
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Re: pic: Wheel

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Originally Posted by Madison View Post
Why?

What advantages does this offer over a more common, more flexible approach?
I will have to echo this question.

That said it is definitely "cool"
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Unread 09-02-2012, 13:30
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Re: pic: Wheel

Quote:
Originally Posted by Madison View Post
Why?

What advantages does this offer over a more common, more flexible approach?
I find it cool that the sprocket is part of the wheel... this allows for a rigid "mount" that cannot be beat.

Last edited by Sean Raia : 09-02-2012 at 13:32.
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Unread 09-02-2012, 13:33
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Re: pic: Wheel

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Originally Posted by Sean Raia View Post
I find it cool that the sprocket is part of the wheel... this allows for a rigid mount that cannot be beat.
It's definitely rigid at the expense of a huge amount of machining time and material waste. The sprocket also doesnt have the typical chamfer which could lead to interesting performance as well.
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Unread 09-02-2012, 13:34
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Re: pic: Wheel

Quote:
Originally Posted by Madison View Post
Why?

What advantages does this offer over a more common, more flexible approach?
Someone has an extreme aversion to fasteners?

In a way, it's built like an aircraft part: lots of material wasted to get a complex solid shape—but few fasteners and joints to worry about, and minimal weight. But it seems like if you're going to go to those lengths to save weight, you ought to do something about the rim thickness. (Or is it going to be sliced much narrower later, and/or turned down significantly?)
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Unread 09-02-2012, 14:11
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Re: pic: Wheel

Quote:
Originally Posted by Madison View Post
Why?

What advantages does this offer over a more common, more flexible approach?
It removes 6 bolts, nuts, washers and spacers per wheel from your drive system.

Quote:
Originally Posted by sdcantrell56 View Post
It's definitely rigid at the expense of a huge amount of machining time and material waste. The sprocket also doesnt have the typical chamfer which could lead to interesting performance as well.
Machine time is really not that bad because all that really is added is a roughing operation to remove the material from the OD of the wheel to the OD of the sprocket then an 1/8" cutter does the teeth of the sprockets and for extra lightning I went in with a 3/16 cutter to put the spokes on the sprockets then finished it a woodruff/ keyseat cutter to get the space between the sprockets.
As far as material waste it uses an extra 3/4" of stock on the wheel.
The lack of the chamfer is not that big of a deal I have ran sprockets like this over the past 3 seasons with no issues.
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Unread 09-02-2012, 14:13
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Re: pic: Wheel

Just think how much fun it'll be when you find out you need a slightly larger or smaller sprocket!
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Unread 09-02-2012, 14:17
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Re: pic: Wheel

Quote:
Originally Posted by 45Auto View Post
Just think how much fun it'll be when you find out you need a slightly larger or smaller sprocket!
On the drive system between wheels the ratio should always be 1:1 (assuming same wheel size) and with one of the wheels being direct drive if there is a ratio issue it would be accounted for in the gearbox
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Unread 09-02-2012, 14:43
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Re: pic: Wheel

Quote:
Originally Posted by sdcantrell56 View Post
It's definitely rigid at the expense of a huge amount of machining time and material waste. The sprocket also doesnt have the typical chamfer which could lead to interesting performance as well.
Yeah, I'd be interested in how the sprocket without the chamfer would work out. I predict finikeyness if not executed properly...
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Unread 09-02-2012, 15:47
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Re: pic: Wheel

Quote:
Originally Posted by Jeff 801 View Post
It removes 6 bolts, nuts, washers and spacers per wheel from your drive system.
What is the weight benefit for that? Is there another benefit besides weight? This just seems like a really impractical way to make a wheel.
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Unread 10-02-2012, 10:39
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Thumbs up Re: pic: Wheel

Not to give the textbook mentor answer, but if students learned in the process, I see that it has more benefit than just weight saving. If they didn't... well it's still pretty nifty.




I too was wondering why the rim thickness was kept so thick, until I realized the center spokes of the wheel are only about 3/4" or so wide (relative to wheel width). I also realized that's what you meant by "a lot of material was removed from the back side".
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