Sailorwoman

I have to cut some quarter square triangles and I thought that instead of cutting a square, marking the diagonal, then cutting and sewing, I might be able to use a triangle ruler. I have both the E Z companion angle ruler and the tri-tool. I have to have a finished block of 2 1/2 inches made up of 4 quarter square triangles. So, my question is: which ruler should I use and what size do I cut each triangle. I could do the square and diagonal method but after trying to figure out the rulers, I am determined to get an answer. (I have heard that stubbornness can be a virtue). I have done this on paper and it seems to me that I should use a strip of fabric 1 1/2 inches wide. However, when I put this under the companion angle the side measurement is at 2, which apparently is the size of the finished base. To me, the base should be 2 1/2 inches. As I say, I can do it by cutting squares but now I am just stubborn enough to figure this out. Any help would really be appreciated.

GingerK

I believe the formula is to cut the square 1 1/4 inches bigger than the size of the finished block. So that would mean a square of 3 3/4 inches sub cut diagonally into quarters. I would take a square of paper, sub cut and measure the results. As far as which ruler to use--sorry can't help you there.

Kitsie

See if this tutorial by one of the QB members can help you! Sure works well!
Quarter Square triangle blocks with no bias edges

bearisgray

one can cut QSTs one at a time or from a strip.

if you want a unit that finishes at 2-1/2 inches, the theoretical width that the strip should be is 1-7/8 inches wide.

i would use a 45-45-90 degree ruler ( i am not familiar with what the names of the various rulers are).

the long edge (hypotenuse) would be on the edge of the strip and it should measure 3-3/4 inches long.

EasyPeezy

You should be able to use the Companion Angle ruler for that.
Here's a tutorial using CA ruler and jelly rolls.
http://thehappyzombie.com/blog/?p=181

joe'smom

QSTs are as easy as a four patch with the Companion angle ruler.

'Finished' indicates the size of the unit when it is sewn into the quilt. When you say 'finished,' do you mean the size of the unit you want to work with, before it is sewn into the quilt?

If you're looking for a finished 2" QST, meaning a unit that is 2 1/2" in. before being sewn into the quilt, I think you would want to start with 1 1/2" strips (1/2 size of the finished unit plus 1/2" for seam allowances).

If you google 'make QST with companion angle ruler' you're sure to find a bunch of video tutorials.

Rhonda K

Better yet draw them on a large size paper. Copy at the office store. I cut the fabric a little larger than the paper. Stitch across the lines and cut. Easy!

I used a piece of stabilizer to make the stitching pattern and made 48 HST at a time! Hope that helps!

EasyPeezy

Bonnie Hunter has a good tutorial on using the Companion Angle
and Easy Angle rulers.

http://quiltville.blogspot.ca/2013/0...ty-rulers.html

Rhonda K

Sorry, I mis-read your post and replied too quickly. This method was used for HST.

Sailorwoman

Thank you for all of your help. It certainly is appreciated.