Thread: I need help with cutting calculations

I'm making 12" finished blocks set on point so I need the calculations for making the setting triangles and cornerstones. BUT the setting triangles and cornerstones are made from a nine patch with a four-patch in each corner. Hope this makes sense, I don't have access to a scanner to show the actual block.

With a complicated design like this, I think we need a picture or link.
If you don't have a pattern, what I would do is make a full block for your first setting triangle & starch the heck out of it. Mark the diagonal, then sew a line of stay stitching just to one side of the diagonal. Then cut it. but NOT IN HALF, remember to add the 1/4" seam allowance past the diagonal line. Your setting triangle will have a bias edge, but with the stay stitching & careful handling you should be OK. Use this cut triangle as your pattern for the rest of the settings.

Perhaps these graphics will help you visualize the process.

Jan in VA

Originally Posted by Jan in VA

Perhaps these graphics will help you visualize the process.

Jan in VA

jan, great explanation! your drawings are always so clear

Originally Posted by Jan in VA

Perhaps these graphics will help you visualize the process.

Jan in VA

OMG Jan how do you do this???? you need to move next to me in California :-)

Originally Posted by Charming

OMG Jan how do you do this???? you need to move next to me in California :-)

Oh no, Faten, no way! Earthquakes, high cost of living, no change of seasons, weird/wonky people, high crime, bad air (in many places).....nope, you come here to the beautiful mountains and foothills in central Virginia where the living is easy, the air is clean, and we celebrate 4 lovely seasons every year! And I also teach here.

Jan in VA

Originally Posted by Jan in VA

Oh no, Faten, no way! Earthquakes, high cost of living, no change of seasons, weird/wonky people, high crime, bad air (in many places).....nope, you come here to the beautiful mountains and foothills in central Virginia where the living is easy, the air is clean, and we celebrate 4 lovely seasons every year! And I also teach here.

Jan in VA

I totally agree with you Jan. I am sick of everything you mentioned here. I don't even know how people can have a business here and survive it. I just launched my website but i feel that the IRS are behind my door every day i open the office...lol
I wish i can find another spot and just move but it is hard if you didn't really visit. I am planning on cross country trip with my husband so we can explore other States so hopefully that would open new horizons...:-)

I always hated trying to do the match so I bought one of those large acrylic triangle rulers that have the lines that coordinate with cutting the setting triangles. Good job with the written explanation Jan !!

Originally Posted by joyce888

I'm making 12" finished blocks set on point so I need the calculations for making the setting triangles and cornerstones. BUT the setting triangles and cornerstones are made from a nine patch with a four-patch in each corner. Hope this makes sense, I don't have access to a scanner to show the actual block.

Here's the block I'm trying to cut in half for the setting side triangles and in fourths for the corner triangles. The finished blocks are 12" set on point.