See the square in the center of this block? It's sitting on it's point. In the past, to rotary cut this square I would have taken the diagonal measurement {which is 3"}, divided it by 1.414 to find the length of the square's side and added 1/2" for seam allowance. My answer would be 2.6216407. Try to find that number on your ruler!
But now I have a brand new ruler -{ingenious it is} - to cut on point shapes.
Don't mix this up with your regular rulers, because the 1" mark is not 1", but will cut a square that is 1" on the diagonal {seam allowance included}. Super easy! The ruler comes with a sheet of instructions for many uses and you can even catch a Youtube video here, where it's designer walks you through the process. Here's a little example:
With a sketch on paper, I can see that I need a center square that measures 3" finished across the diagonal.
Using the 3" line on the On Point ruler, I cut my square. The seam allowance is built in - see the clear area around the edge of the ruler? - that's the seam allowance.
You'll notice in my block drawing that the rectangles are on point also. I knew that the diagonal measurement of the short side was 1 1/2", so I cut a strip using the 1 1/2" mark on the On Point ruler. The instructions suggest laying the ruler on top of a drafted rectangle to determine your markings. Then use the indicated marks for cutting.
I did a bit of thinking and realized my long edge of the smaller rectangle had to be the same size as the square. I trimmed it using the 3" marking.
The long side of my larger rectangle was the same as the side of a square with a 6" diagonal measurement {my finished block size}. I used the 6" marking and voila!
They fit perfectly!
The instructions also explain how to cut half square triangles that sit diagonally in a block. Haven't tried that one yet!
Here's my finished block...
Part of a series of 6" blocks. More to come on that project!
For more information about the ruler visit Donna Lynn Thompson's website!
All in all, I'm super excited about this ruler. I think it will improve accuracy tremendously for on point shapes. I just hope I don't forget how to cut 2.6216407" squares!
0 nhận xét:
Đăng nhận xét