The bed bars are very simple parts. I choose to make mine 1" longer that Chaddock, and to try and keep rusting to a minimum, I made mine out of 440 stainless that was heat treated to 35HRc before grinding to finshed diameter.
One change I did make from Chaddock's original design was with regards to the Loctite used to fix the rear bed bar and the vertical wheelhead column. Chaddock recommended boring the holes in the base casting for these bars 0.003" oversize to allow for a sufficient film of Loctite adhesive to lock these parts in place.
I spent a lot of time making sure my bores were straight, on-location, and on-size, so I didn't want to give up this precision by boring the holes oversize. What I came up with was to knurl the bars where they were inserted inside the castings.
A very heavy knurl was done while the parts were still oversize before heat treatment. When the parts were ground to size, most of the knurl remains to provide an area for the Loctite and still maintain metal-to-metal contact between the bars and the base casting bores.
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CAD Files Used On This Page (AutoCAD 2008 Format)
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