mandrel
/ˈmændrɪl/noun
1
- a shaft or spindle in a lathe to which work is fixed while being turned车床心轴; 紧轴。
2
- a cylindrical rod round which metal or other material is forged or shaped（锻造金属用）芯棒, 顶杆。
3
- Brit. a miner's pick〈英〉（矿工用）镐。
词源
early 16th cent. (in sense 3)： of unknown origin.