QCTP toolholders in aluminum?

[TomG]

Aluminum is not appropriate material for a tool holder. It lacks the strength and mass of steel so it would be unable to hold the tool in position against the forces of a cut, resulting in chatter. It also lacks the durability of steel, so it would get beat up in no time. Commercial tool holders are hardened and ground for durability and precision. I would suggest making them out of mild steel and case hardening them for durabilty. I harden all the tooling that i make. No sense putting a lot of work into making something if it's going to look like hell after a few uses.

Tom