Cutting Block 3b for the U3A

Block 3b

This time we are using the rotary cutter for all the shapes.
To cut squares to make half square triangles you need to add 7/8" to the finished size of the unit, that is 4 7/8" for a 4" finished unit. Cut once from corner to corner.
To cut squares to make quarter square triangles you need to add 1 1/4 " to the finished size of the unit, that is 5 1/4" for a 4" finished unit. Cut twice from corner to corner.
For squares add 1/2" that is 4 1/2" for a 4" finished unit.

To make a block like this you need  a 4 1/2" centre square, four 4 1/2"  corner squares, two 4 7/8" squares for the half square triangles and one 5 1/4" square of each of two fabrics for the quarter square triangles.

Cutting the squares; the QST squares
are layered right sides together ready
to sew.

Arrange like this.