To make a pattern for the lost-foam casting an essential tool is a hot wire cutter. I've decided to make a building guide to show how I've made mine.
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Step 1: Preparing Building Materials
First of all, it's important to prepare planks and a bottom base by grinding and sawing.
Step 2: Constructing
When a frame and a base are ready it's time to assemble everything in one object
Step 3: Bottom Stretcher and Energy Connection
Installing a bottom stretcher and energy connection
Step 4: Energy Supply
For energy supply I use automotive battery charger. It allows to get 12/6 V and 1-9 Amps.