Hi Guys,
This is a dimensioned drawing, showing the hole sizes. I said previously 8 mm diameter, it should have been 10 mm. Sorry about that. Its only just over a year since I made these.
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I used M5 counter sunk screws to hold both threaded nuts and the side plates together and made brass cup washers to support the CSK screws.
The central pivot was made from 10 mm round bar drilled through and threaded M5 from both ends before pressing it into a PVC spacer.
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All the cup washers were turned from bits of brass scrap picked up at the local scrap yard. They were drilled 5.25 mm in the lathe, then placed on a mandrel and turned to 10 mm diameter. I had several bits of brass of different diameters and different lengths. When they were all the same diameter, I put them in the chuck and countersunk the end to the depth of the head of the screw, just under 3 mm and then parted off slices of three millimeter long. Countersunk the next one and did the same again. I did this until I had 24 washers.
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These are the completed spacers and nuts.
At this point you should be able to test fit everything together. The side frames should be a close fit on the pivot points and have very little play.
I said earlier that the nuts were drilled and threaded M8, these nuts were drilled and threaded M10. Which ever size one you use, the bottom anchor will need to be drilled to suit the threaded rod machined end size.
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This is a picture of the threaded rod used to operate the clamp. The end is turned down so that it is a loose fit in the bottom nut. The turned end is drilled and tapped M5 for the screw that is used to retain it...
I'm going to take a break here. Thanks Guys.