Milling is machining things using a rotating tool. Typically this is done using a milling machine but with a bit of ingenuity it also be done in the lathe.
Milling

Sharpening

Trepanning

Cutting a circular groove or hole leaving the centre material in place or forming a separate disk. A more efficient technique that boring or drilling in that it removes less material
Trepanning

Turning

Welding

When I was an apprentice at Dowty we were sent to Stroud College to learn some specialist skills and complete an electronics project. We decided to build a tracking solar panel that followed the sun. For this we needed a framework to support our mocked up panel. So I temporarily joined the metal work class and watched the demonstration of lots of different types of welding. I also learnt how to braze using Oxy-Acetylene. I practiced this on the framework for the tracker.

More recently I attended an evening class at Chelsea College of Art and Design with some other beginner welders where I built a giant flea sculpture using MIG welding.

After doing some research I bought a small DC TIG welder from R-Tech Welding who I also use for welding supplies. The reason for picking this is that it’s has less sparks so is safer for my small workshop and can be used on a wide variety of sizes of steel. I did not need to use the welder in a lot of different places so transporting the argon tank is not an issue. I have used this welder for variety welding projects in my workshop shed which you can see listed below. If you use MIG or TIG then I can definitely recommend getting a large refillable gas canister (in my case argon) as the small disposable canisters will run out quickly and it will become expensive very quickly. I found that even for a quick project such as my Obelisks that required multiple canisters.
Welding