Sunday, 6 January 2013

How to sew equilateral triangles - a tutorial

As regular readers will know, over the last little while, I made two quilts featuring lots (and lots) of equilateral triangles.  

sixty degree triangle quilts

I have already done a tutorial on cutting equilateral triangles, and thought it might be useful to put something together showing my method for sewing them together.  Here goes!

First, line up the triangles you want to sew together.  I strongly recommend that you line the triangles up with the grain kept straight, unless a design decision dictates otherwise.  If you keep the grain straight, once you sew the triangles together in rows, all your bias edges will be stitched up and there is less chance of your strips warping.


how to sew sixty degree triangles
The arrows indicate the direction of the grain


 Then, flip one triangle over so that two rights sides are touching.

how to sew sixty degree triangles

Pin along the seam line.

sewing equilateral triangles tutorial

Sew a quarter inch seam using your preferred method (I like using my quarter inch presser foot).

sewing equilaterial triangles tutorial

Remove pins and finger press the seam open, focussing on the corner that touches the next triangle to be added.

sixty degree triangles tutorial

Turn your sewn piece right side up and slot it back into your layout.  Flip the next triangle over so you have right sides touching.

sewing equilateral triangles tutorial

Pin along the seam line like before.

sewing sixty degree triangles tutorial

When you are pinning, if you can get one pin through the seam, it will really help keep the seam open.

sewing equilaterial triangles tutorial

Keep stitching your triangle pieces together so you have two strips.  For the end square up pieces, make sure that the top straight edge is at least half an inch wide.  If you make it exactly half an inch, you won't need to square up the edges, but as long as it is at least half an inch wide you will have enough fabric to square up and have a seam allowance so you don't lose the points along the edges.

equilateral triangles tutorial

Once you have stitched all your triangle pieces and end pieces together into strips, you should have something that looks like this:

equilateral triangles tutorial

Pressing time.

how to press equilateral triangles

I like to press hot and with lots of steam.  To avoid the steam warping the bias edges, I finger press the seams open and then just hover the iron over the seam so it is just touching.  I find the seam just folds out flat with little effort.  I like to use the residual heat in the ironing board after I have pressed one seam to help with finger pressing the next seam.

equilateral triangles tutorial

Now it's time to sew your rows together.  Pin the rows together with the points aligned and sew a quarter inch seam. 

equilateral triangles tutorial

 Press the seam open...

equilateral triangles tutorial

...and bam - nice equilateral triangles.

equilateral triangles tutorial

So, that's how I do it.  I'm sure there are other (possibly better) ways, but this works for me.  Please let me know if you have any questions - I am happy to answer via email and will update this post if I think the answer will be of general application.

Finally, I thought I would do a little demonstration to show why I cut the corners off all the equilateral triangles.


Little extra flappy triangle bits.  Bulky seams.  Need I say more?

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7 comments:

  1. Thank you! Keep this post for a reference, for I definitely plan to make this quilt this year! :)

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  2. This is a wonderful tutorial- clear and concise with great hints! I am SO doing one of these...when I cross a couple of things off my UFO list! Thanks Adrianne for sharing your expertise!

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  3. Great, thank you, that's really useful. How did you cut the triangles? Have you got a template? I need to order one online, so if you have a particular one to recommend, that would be helpful.

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  4. I love finding NZ bloggers. These instructions are great!!!

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  5. I was totally looking for this in my pins and found it AFTER I started piecing mine (badly). Haha. But now I have it, so I'm going to start over. Thank you for a great tute! :)

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  6. Thanks for the great tutorial. I'm attempting a triangle quilt today and I need all the help I can get:)

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  7. Are you supposed to trim those sides that have a high/low look? I don't understand how you can sew a quarter inch seam and still catch in all the fabric otherwise.

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