So, you want to make a 12 inch block and found a great pattern but there’s a problem. The pattern is the wrong size. Guessing at enlargement can be a frustrating and inaccurate experience.
Here are two ways to a speedy conversion:
1. Use a COPY MACHINE.
- Use a machine that you can change the size by percentage %.
- Lay your pattern pieces on the face of the machine and use the following percentages for conversion to a 12 inch pattern (this was figured out by a math brained engineer I know)
- Enlarge an 8″ block by 150%
- Enlarge a 10″ block by 120%
- Reduce a 14″ block by 86%
- CHECK your sizing by measuring the pieces.
- ALWAYS make 1 trial block with a new pattern BEFORE cutting them all out.
2. Use GRAPH PAPER
- Count out 12 little blocks on your paper (or the equivilent to 12 to make it larger) with each block representing 1 inch.
- Draw your pattern on the 12 blocks.
- On graph paper, measure out your pattern in actual size (if you are using 1/4″ block graph paper, 4 blocks will equal 1″.
- Cut out each piece in actual size.
- CHECK your pattern and make 1 trial block BEFORE cutting them all out.
Note: many copy machines will print graph paper (as well as notebook paper and music manuscript paper, etc) or you can print free graph paper from the internet.