Rotisserie design 101, moment resisting connection at the pivot shaft? |
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Rotisserie design 101, moment resisting connection at the pivot shaft? |
bondo |
Apr 10 2007, 10:14 PM
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#1
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
I'm in the midst of over-designing a rotisserie.
The basic idea of a rotisserie is that the bolt on parts that go where the bumpers mount extend a shaft from the center, which acts as a pivot. What I need to know is, is a 914 strong enough that those "shafts" coming out from the front and rear just need to be held up off the ground, or do they also need to be held straight and level? I basically need to know what forces are placed on the uprights... whether it's just a vertical force, or a vertical force plus moment. |
McMark |
Apr 10 2007, 10:32 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
In my experience vertical plus moment.
If you're building an 'engine stand' type rotisserie (lift into place) then it's not a big deal. The one like this that I used was AWESOME! Great balance and easy to turn. No problems, probably because of the increased bracing for the vertical. If you're going to use an adjustable height setup (crank to raise, etc) then you have a problem with binding in the raise/lower action as well as reducing the size of your bracing for the vertical. So that's where the moment becomes a problem. If you're going to do a raise/lower rotisserie, I would weld on a top cross brace to keep the posts vertical. The rotisseries from Eastwood are really nice. I've seen one in person and they are really well constructed. more info here |
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