I worked on the Hoist Ring today. This is the diagram I showed earlier, and the following one with dimensions.
The critical dimensions are:
Ring Diameter = 5/32” – 5/32 drill bit as form, initially (see below)
Eye Diameter = 0.015” - #77 drill bit
Hook Diameter = 0.023” - #73 drill bit
This was just a practice/trial and error session. This is just as well, as the “new” used camera I was using was set on 640X480 resolution, as I discovered when editing the pictures!
I bought 0.008” copper, dead soft brass, and half hard brass wire, to experiment with. The half hard is what I used, the copper was way too soft to hold a shape under handling. I skipped the Dead Soft, and found the Half Hard quite workable, and sufficiently sturdy. There will be no load on the ring as the spar will be glued to the mast.
In this scale, 1/64th, I will not try to replicate the forged construction of the original. At first I tried wrapping the wire around the 5/32nd bit then folding the ends across each other, then vertical to form the hook and eye legs, forming a sharp corner, but no firm connection. This worked, but the ring did not hold its shape during further work. The two corners separated when the ring twisted.
For the “final” version, I used a pair of needle nose pliers, with a stepped taper on one jaw and a flat mating surface on the other. For the area where the legs will be, I tied a simple knot by looping one leg back through the ring. After a bit of pulling and tightening of the knot, I got a firm joint at the legs.
Next I used a pair of flat jawed needle nose pliers to clamp the ring in and stretched the legs to be at right angles to the ring. I then held a #77 drill bit on one jaw, on top of a leg and wrapped the wire around it, forming the eye. Then while also holding the #77 in place, I repeated this on the hook leg, using a #73 drill bit. This time I only wrapped it enough to form the bottom of the hook
The assembly now looked like this.
After playing with it a bit using pliers and tweezers to get everything in line, I cut the excess wire with a single bladed razor.
Here is the final trial piece. You can see some kinks in the main ring. I was reusing the same piece of wire as I practiced, and it was distorted from prior attempts. For the final pieces I'll have to refine the eye, but I'm calling this trial Hoist Ring a success.
When I make the finished parts, I’ll take a better sequence of pictures. I finally got the camera reset to take full resolution (14megapixel) shots, so the pictures will be better next time.
It may be a few weeks before I can get back to the model. I’m about to start a month long 12 hours a day 6 days a week short term job.