Turnlock small circle compass attachment

A circle compass for use with a router comprising:

• a main body defining a top side and a bottom side, the main body being configured to attach a router adjacent the top side and the bottom side being configured to rest on a work piece and opposite the top side, the main body having a central receiving aperture configured to receive a rotating portion of the router therethrough for rotation about a center axis;
• an adjustable arm attached to the main body, the adjustable arm having a centering pin, the centering pin extending axially outward beyond the bottom side of the main body, the adjustable arm adjustable along an adjustment axis between a retracted position and an extended position, the retracted position being associated with a smallest hole that can be formed using the circle compass with the centering pin closest to the center axis and the extended Position being associated with the largest hole that can be formed using the circle compass with the centering pin farthest from the center axis, the adjustable arm defining a clearance slot through which the rotating portion of the router must extend to form a cut in the work piece;
• wherein the main body includes an adjustable arm receiving slot in which the adjustable arm is positioned, the adjustable arm being recessed within the adjustable arm receiving slot such that an outer surface of the adjustable arm is equal to or recessed within the receiving slot in a direction that is generally perpendicular to the adjustment axis;
• and
• wherein the adjustable arm receiving slot is formed in a top surface on the top side of the main body.

A circle compass for use with a router comprising:

• a main body defining a top side and a bottom side, the main body being configured to attach a router adjacent the top side and the bottom side being configured to rest on a work piece and opposite the top side, the main body having a central receiving aperture configured to receive a rotating portion of the router therethrough for rotation about a center axis;
• an adjustable arm attached to the main body, the adjustable arm having a centering pin, the centering pin extending axially outward beyond the bottom side of the main body, the adjustable arm adjustable along an adjustment axis between a retracted position and an extended position, the retracted position being associated with a smallest hole that can be formed using the circle compass with the centering pin closest to the center axis and the extended Position being associated with the largest hole that can be formed using the circle compass with the centering pin farthest from the center axis, the adjustable arm defining a clearance slot through which the rotating portion of the router must extend to form a cut in the work piece;
• and
• wherein the adjustable arm has a rear portion and a front portion, the centering pin being attached to the front portion, the rear portion always being on a first side of the center axis and the front portion and centering pin always being on a second opposite side of the center axis along the adjustment axis when a rotating portion of the router extends through the clearance slot.