The cam out is a feature not a bug for when these were invented. They were made well before we had electric torque control cheaply and easily, so assembly lines developed Phillips to control torque using the driver and fastener. It’s literally designed to cam out on its own at a given torque setting.
The cam out is a feature not a bug for when these were invented. They were made well before we had electric torque control cheaply and easily, so assembly lines developed Phillips to control torque using the driver and fastener. It’s literally designed to cam out on its own at a given torque setting.
AFAIK, this is a myth. The original patents don’t include the tapering, and someone else in the comments quoted the relevant parts from Wikipedia.