So far I have only tested the water flow. I am assuming it is big enough to cool just about anything and it will stay that way untill I have built the rest of the brewery! The lid will probably steam up, but hey ho. I am now going to try to tack a few pictures on this answer to show how the former was made....Yep, that worked. So now you can all see why my peristaltic pump project is taking so long! I've been messing about building this baby instead! I will be back on the pump project over the next few weeks....as a taster, the Mk2 pump has been lightly bench tested at work using a cup full of water! It primes by hand!!!!!!! but that's another post...
Square blocks are drilled centraly to provide a hole with a good clearance around the pipe you will be bending. The blocks are then sanded to a circle. The end block is shaped to form the left and right bends to start the coils, then the blocks are all screwed together making sure the central hole is in line. I have used an industrial foam here that is quite hard but easy to sand. In wood terms it is harder than balsa wood and it is harder than the blue foam you get for underneath concrete floors.
This end block is shaped so it will form the 1/2" copper tube into both left hand and right hand start bends and position the pipe at the start of the spiral I.E. on the side of the circle.
The shape of the block allows the copper tube to come out of the central hole and bend out and around at the same time. It is bent either left or right depending on which hand of coil you need to make
Here is a coil coming off the former. Make the central hole a good clearance for the copper pipe you are using and once the coil starts to come off, pull by the central bend so the pitch of the coil is not bent out of shape. Remove the end caps and vibrate the sand out.