Wooden gears (such as those used in automata) are usually made of high-quality plywood because it's more dimensionally stable.

What types of plywood are higher grade?

• grades
• aircraft grade
• baltic birch

• http://www2.wisd.net/it/PLYWOOD.htm
• APAP - American Plywood Association
• types of repairs that get made [1]
• glossary [1] [2] [3]
• core wood [1] [2] [3]

• [1] [2] [video]
• biscuits [1]
• dado [1] [2] [3] [4] [see section 3]