Not All Patches are Rotary Cuttable
EQ8 does not give results for all shapes. Kite shapes are one example. These shapes will be lettered in the Key Block but not listed in the chart. This is not a mistake. EQ8 intends for you to use templates for any patches not included in the chart. Depending on the number of patches that may be missing, selecting a different pattern type, like templates or foundation patterns, may be a better alternative.
Rotary Cutting Requires Rounding
Rotary cutting dimensions are nearly always approximations. For example, the 7/8 inch (.875) that quilters conventionally add for half-square triangles is really .85355 inches, rounded off to the nearest 1/8 inch so that we can read it on the ruler. Experienced quilters in fact cut a little “shy” in this case, since .85355 is a little less than .875.
Because rounding is inevitable, this means that several small inaccuracies can add up to something significant. For example, this block has 7 patches across by 2 patches down. If you wanted a 10-inch block, this would mean that each rectangle has a finished size of 1.43″ by 5″ so we would need to cut 1.93″ by 5″ and 1.93 is not to be found on the ruler. EQ8 will round to 1 7/8″ by 5 1/2″. By the time we pieced 7 of these small inaccuracies together, our finished block is 9 5/8″ by 10″. That’s 3/8″ too narrow!
Getting the Most Accurate Charts
EQ8 will give you the exact measurement of the patches so that you can decide if you want to use the Rotary Cutting Chart or some other pattern printing method.
In the Print Rotary Cutting Chart dialog box, choose No rounding. Preview the results. Compare the sizes with the rounded values. This will give you the information you need in order for you to make a judgment on using the chart.
Remember Design and Size Go Hand-in-Hand
Visualize a grid of squares over the design of the block to help you determine the best size to make a block. For example, a Nine Patch style block works well at 3, 6, 9, 12 and so on for the overall size. In the sample block above with 7 across, 10 inches is not a good size choice. If we choose 10.5 inches for the size of the block and turned off all rounding, the Rotary Cutting Chart tells us to cut the strips 2.0″ by 5.75″. When we turn on rounding, we get the same sizes! So by changing the overall block size, we’ve eliminated all the rounding.