rotary cutting, Uncategorized

Rotary cutting Part 8

This is the final instalment of our rotary cutting series and looks at cutting the triangles needed for the Peaky and Spike unit.

unitThe centre triangle is an isoceles triangle – its height and base are the same length, so you can cut it from a square. The triangles at the edges (long, or skinny triangles) are half as wide as their length and are thus cut from rectangles.

The square for the centre triangle should be cut 1 inch larger than the finished unit. If you want to cut more than one triangles then cut a strip 1 inch wider than the finished unit – for a 3 inch unit, cut a 4 inch strip.

Mark 4 inch squares along the length of the strip. Make sure you mark on the wrong side of the fabric as these marks may be visible later. The marks in the photos are heavy and thick so they show up, yours should be much lighter.

measure and mark squaresOnce all the squares are marked you need to mark the midway points between the squares – in this example that would be at 2 inches.

mark halfway pointsThese marks could be much shorter than the ‘square’ marks, or in a different colour.

all marking doneMake the first cut by placing the ruler on the bottom of one ‘square’ mark and the next midway mark on the opposite side of the strip.

first cutAnd cut along the edge of the ruler. No angles to measure here as isoceles triangles don’t have nice ‘easy to measure’ angles.

first cut doneTo cut the triangle place the ruler at the bottom of the next ‘square’ mark and at the tip of the cut you just made (on the midway mark).

second cutand cut.

first triangleCut the next triangle by placing the ruler at the base of the ‘square’ mark and the top of the next midway mark – (and you can see why you mark on the wrong side of the strip)

second triangle doneContinue along the strip until you have cut the number of triangles you need. Don’t forget that you can keep the strip folded and cut two triangles at a time – its much quicker.

Now its time for the skinny triangles. The rectangles should be 1 + 1/4 inches longer than the unit and 5/8 inch wider than half the width of the unit. So our 3 inch finished size units needs rectangles that are 4 + 1/4 inches x 3/2 + 5/8  (i.e. 2 +1/8) inches. For each unit you need two mirror image triangles – this means you need to cut two rectangles to start with. It is easier if you keep the strip folded and cut the rectangles in pairs.

Cut the paired rectangles in half across one diagonal.

cut rectangles in half

rectangles cutThis will give you two sets of mirror image triangles

mirror imagesThese can then be paired with the larger triangles –

pair with trianglespaired ready to stitchready to stitch together.





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