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Unread 13-08-2008, 18:08
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Re: Crab drive question

Quote:
Originally Posted by RaMoore View Post
From McMaster we use:
6391K215 1/2" ID Sleeve Bearings (custom cut these to length for vertical and upper horizontal shafts)
1570K43 1/2" Keyed Aluminum Shaft (for vertical and upper horizontal shafts)
5911K42 3/8" Aluminum Shaft (for lower, wheel, shaft)
Small PVC or sleeve bearing for the 3/8" shaft
Have you used those shafts in the past? The first is 2024, which is probably OK. The second is 6061, and I would almost guarantee that it will fail if used in such a high load application. Especially at 3/8" diameter. I'd recommend 2024, 7075, or 7068 for shaft applications. 2024 is the most commonly available (and cheapest).
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