Silver Soldering. Another Method of Parts Positioning.

by John

This is one of the few parts required to finish the model Armstrong 80pr RML cannon on a wooden carriage and traversing platform.

It is the ring which is attached to the rear of the carriage, used to control the descent of the carriage and barrel down the slide to the firing position, with a rope attached to the ring. The bracket is buried within the rear transom, and extends underneath the transom with more screws and bolts.
I cut the bracket pieces from 2mm flat brass strip, using a 3mm diameter endmill.

The issue in silver soldering the pieces together was that they are quite small, about the size of my little fingernail, joined at an 95º angle, with the ring also soldered in place in the same heating session. And I did not want solder getting into those 1.6mm diameter holes.

So I screwed the angle pieces to a block of hardwood which had a 95º angle, having fluxed the edges carefully to exclude the flux from the tiny holes. I would have added typists white-out if I could have found it.

I knew that the wood would catch on fire with the soldering torch, but hoped that it would retain its basic shape until the solder solidified. The steel on top was to hold the ring in position during soldering. If the method did not work I figured that I could make an aluminium shape to replace the wood.

After soldering, I put out the fire by dunking the assembly in a bucket of water.

And it cleaned up quite well. Now to carve rebates in the transom so the bracket sits flush with the wood surfaces.

The circular cutout is to allow the end of the Smith’s Screw to protrude under the transom.

Not much to show for several hours in the workshop, but it’s better than working. And best of all the method was successful.