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Gordon Rayner
professor emeritus
Reged: 03/24/07
Posts: 506
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Re: Who can build me a fork mount?
07/07/08 01:48 AM Attachment (36 downloads)
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Here are some photos which Wes requested. The elevation bearing clamps are similar to milling machine table clamps. One can see similar principles applied in the Carr-Lane ( St. Louis, Mo.)fixture parts catalog. The mated, slightly rusty spherical washer pair under the locking knob ( one has one convex face, the other has one concave face) allow clamping through a wide angular rangeto accomodate a range of trunnion diameters. The slot in the top clamp allows fore-aft adjustment. The heel post is a button head or other rounded head screw, whose convex head fits in a concave cavity in the heel of the top clamp.
The pressure pad which presses the trunnion is Delrin-AF. The trunnion is Delrin rod. It can be cut squarely in a chopsaw/ miter saw/miter box, then drilled axially in a lathe or in a v-block on a drill press table, then tapped. I used 3/8-16 for attachment to the oak cradle and for the handle(not shown) attachment 2- fluted thumbscrews.
The fork is 2 x 3 x 1/8 aluminum box tube, surplus from the BART light rail project in San Francisco in the 1970's, I removed the paint, shined them, and then Alodined them. The fork arms adjust in and out to accomodate various loads, up to 25 x 150 Fuji I ( with trunnions), about 65 lbs, and including the Nikon I, II, and III 20 x 120, such as Kim Colter has. The azimuth bearing is two mated magnesium cones. I also made some cylindrical aluminum versions.
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