mandrel
Isaac Kremer/ September 9, 2023/ / 0 comments
A short shaft of uniform or varying diameter upon which various pieces pieces of metalwork can be mounted for turning in a lathe. 2. A heavy steel tube or core that is inserted into a thin-walled casing to prevent it from collapsing in the driving process, and then withdrawn before concrete is placed in the casing. A metallic core used in driving Raymond or Simplex piles. (Ching, 1995)