|Steam Punk quilt with larger and small blocks|
I won't give the exact measurements of Steam Punk; you'll have to buy that pattern. But let's pretend the original finished block was 4" and the blades intersect the side 1.25" from the corners (Fig. 1 below.)
|Fig. 1 - example of original block at 4-inches|
Draw a new block 8" on each side (4" x 2) and mark the center of the block. Using the scale factor already!
Mark points on all four sides 2.5" from the corners (1.25" x 2). Scale factor again!
|Fig. 2 - example of drafting an enlarged circle block|
Using a compass with the sharp point in the center of the block and the pencil at the side point 2.5" from the corner, draw new curves for the blades. If your compass won't expand that far, use your ruler. Place the end on the center of the block and align the ruler through that 2.5" point.
Notice the measurement on the ruler. On my example it's about 4.25".
|Fig. 3 - enlarged block with main lines drawn|
Note: If you're making a really large block, use your rotary ruler. This tiny ruler just made the photo easier to shoot and see.
|Fig. 4 - drawing a circle or arc on an enlarged block|
|Fig. 5 - enlarged arc is drawn|
The radius of the center circle will also be multiplied by the scale factor. So if it was one-half inch originally, it will be one inch in this example (1/2" x 2).
Trace each template, add seam allowances and you're ready to go!
Hope this helps. Let me know if you have questions.