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Unread 31-07-2013, 10:33
Jay Burnett Jay Burnett is offline
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Re: pic: offseason Wheel cage and pivot desgin

Quote:
Originally Posted by magnets View Post
Nice design!

Just a few questions/comments:

What sort of belts are you using for drive?
The drive belts are 3/8 wide, and the steering belt is 1" wide

Quote:
Originally Posted by magnets View Post
What sort of bearings/bushings are being used for the wheel cage rotation, and how far apart are they on the tube?
There is a lazy susan bearing on top of the pivot cage and a flanged 1/2 diam bearing directly above that.

Quote:
Originally Posted by magnets View Post
In the wheel cage, the upper shaft has no bearing. How does this work?
There is a bearing there, the photo just isn't hi-res enough to see it

Quote:
Originally Posted by magnets View Post
What diameter shaft are you using in the wheel cage?
It is a 1/4 in shaft that thickens to 1/2 half in the middle to help retain the gears.

Quote:
Originally Posted by magnets View Post
The top of the module looks really really thin/too weak, you may want to consider making it stronger. If you don't know how thick/wide to make your plates, you can look at 1640's swerve here, which has a similar wheel cage design.
Also you need to fillet all the right angles, as it makes it considerably stronger/easier to machine.
How are you planning to machine this, out of a solid block of aluminum? (If so, I would recommend a design like this.)

My biggest concern is the sides of the module getting bent, so I would recommend making that connection stronger, as well as putting some sort of brace on the front/back like 1640 has.
Thanks for the feedback, Magnets. I have looked at 1640's website and i think the sides of my pivot cage are a bit thicker than theirs, but I will thicken the top. I would like to try makinging the cage out of one piece on a bending machine, but I don't know if aluminum will be strong enough to take the sideways force.
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