Small Steps. Armstrong Cannon.

by John

6 hours in the workshop today.  I am constantly surprised at how little progress appears per session.  Also surprised at how quickly the time passes.

I had left the external dimensions of the cannon chassis girders rectangular, to facilitate holding the items, while doing as many machining processes as possible with the rectangular shape.  But today I bit the bullet, and made the final girder shape.

PANA3776

There is a 4º angle at each end, and a 6º slope along the bottom of each girder.  Also, the top flange is 11.5mm wide, and the bottom flange is 14mm wide.

PANA3773

Setting up for the bottom 6º angle.  The 4º ends had been machined before this.

The rivet holes are different at each end

The 4 girders are all looking good.  Next to start making end pieces and brackets.  I am still waiting for rivets to arrive, so the assembly will be bolted together initially.