Originally Posted by GrannieAnnie
How do you make continuous bias? Don't you have to seam sometime or another.
I've used this method, but let me preface it by saying that you can also make mistakes with this, I've done it wrong twice in the four times I tried.
Start with a square of fabric. What size square? Determine the length of the binding that you'll need and multiply by the width of the strip. Then take the square root of the result. For example, if you were going to make binding for a 12.5" square quilt, the length that you need would be 50". If the width is 2", then 50 X 2 = 100. The square root of 100 is 10. Then add another some extra, so I would use 12" or so.
Mark the top with the letter A. The bottom with the letter B. The left with the letter C. The right with the letter D.
Cut the square diagonally from the corner CA to BD.
Match sides A and B with right sides together and sew a 1/4 inch seam. Press open.
Then mark lines on the resulting parallelogram from sides C to D, using the desired width of your bias. (I do this on the right side of fabric.)
Now, with right sides together match the top of side C to the 1st line on side D. Yes, this will get wonky. Each line should match up. You should have an extra row on top of D and the bottom of C. Sew 1/4" seam. Press open (this is hard). Turn so you can see the marked lines.
Then using a scissors, cut along the marked lines. You will end up with one long piece of bias.
Hope this helps.