Hi,
- Avoid plywood. The differently oriented laminates make it hard to get
smooth results. - Solid hardwood like beech is much better suitable but you need to be careful with your rpm settings because it tends to burn at high rpm settings.
- Solid softwood is easier to machine but sometimes tends to splinter, especially if the tool is a little dull or of dubious quality.
- If it doesn’t have to be “real” wood you should consider MDF - it is very nice to carve and the surface is usually quite good.
Christian