US Patent 7448419 Setup jig for a router bit

A setup jig for a router bit for setting the desired depth of the router bit includes a profile member having a plurality of outwardly extending projections wherein each projection is shaped with a profile that corresponds to a different router bit shape. The second component of the setup jig is a support member that is constructed and arranged and cooperating with the profile member so as to enable the controlled axial movement of the profile member relative to the support member. The profile member is internally threaded and the support member is externally threaded and the selected pitch is set so as to axially move the profile member 1/32 of an inch for each 45 degrees of rotation of the profile member relative to the support member.