Originally Posted by
deadlykitten
just like mactec said, tooling quality is a must, and i wish to develop a bit : some preffer to buy their toolholders from a single source, in order to avoid variations that may cause :
... a new toolholder, from a different brand, to no longer make face contact
... or make good contact, but creates a different wear mark inside the spindle, that affects the stability of the other brand toolholders
at this moment, the only method i know for inspecting a dual contact is using a thin layer of a kind of paint, then clamp it in the spindle, unclamp, and check contact surface