Laying Out an External Radius

An external convex radius is usually found on the corners or the edge of the work-piece. The radius (corner D), displayed in Figure, needs that a quarter of a circle having 1 cm radius have to be laid out on the work-piece.

(1) Set an adjustable square to 1 cm (centimeter).

(2) Locate the center of the quarter; in such type of a way that center will be at 1 cm (centimeter) from the edge and the end, by scribing intersecting lines at this point.

(3) Mark this intersection point by prick punch.

(4) Set the dividers to 1 cm (centimeter).

(5) Scribe the arc that should just touch the two adjacent edges of the work-piece at a point 1 cm along each side.

(6) Mark this point by prick punch.