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Topic: How do I calculate circles?  (Read 659 times)
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pokeedog
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« on: January 02, 2009 07:43:12 PM »

I've been really into dot and circle quilts lately. I've been able to master several "patterns" from books (both quarter and half patterns), but now I want to graduate to creating my own designs. I have a wonderful design all laid out. I think the easiest way would to piece half circles and then sew them together.

However, I'm stuck...how to I figure out the correct diameter of my circles to cut, how do I make sure they fit into the outer curve piece?
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pokeedog
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« Reply #1 on: January 03, 2009 05:41:43 PM »

Ok, I figured this out. Kinda. I still have no idea on how to calculate circles on the traditional machine piecing method.

But, I ran across this awesome technique! http://www.hgtv.com/hgtv/cda/article_print/0,1983,HGTV_32657_4302936_ARTICLE-PRINT-SXS-SIMPLE,00.html!

I'm trying it tonight to see how it goes, I'm very excited, since this technique opens up my quilting to a whole nother level.

There's also a video on the site as well.
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SewHelpMe
« Reply #2 on: January 04, 2009 05:19:54 AM »

I wish I knew how to calculate for circles, too.  If you ever find out, make sure to post the ratio.

Thanks for posting that link!  I have the book Pieced Curves So Simple, but I like this little tutorial.  Explain this:  what's up with that THIRD hand in the last photo?  Ha! Ha!  I thought that was kind of funny!

Also, another good cheater method for making cicules is Easy Bias Covered Curves by Wendy Hill.

Make sure to post your circle block when you're finished with it.  I want to know how it turns out!
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L-train
« Reply #3 on: January 04, 2009 01:03:57 PM »

I'm not sure I completely understand the question, but I'll give it a shot...

If you're starting with the outer curve (the green fabric on the hgtv link), you should be able to measure what the diameter of the circle that makes up the hole should be, making sure you measure in 1/4 inch from each edge (or whatever your seam allowance is). So if the "hole" is 3 1/2 inches across, you'll want to add a seam allowance on each side. It looks like they used 1/2 inch, so the diameter of the finished circle is 3 1/2 + 1/2 + 1/2 = 4 1/2 inches.

The inner circle (the white fabric with the multicoloured hearts) would need to have the same diameter, plus seam allowances. So you'd start with 4 1/2 inch diameter circle, and add an extra 1/2 inch all the way around for seam allowances. You'd end up cutting out a circle with diameter 4 1/2 + 1/2 + 1/2 = 5 1/2 inches.

When you come to sew the two pieces together, your seam will be  in 1/2 inch from the edge of the fabric forming the inner circle, and out 1/2 inch from the edge of the fabric forming the outer curve.

I hope that makes some sense.. maybe a little?  Cheesy
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pokeedog
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« Reply #4 on: January 08, 2009 07:29:17 AM »

Thanks, but the HGTV link totally eliminates the need to calculate traditional machine pieced circles. That's why it's so incredibly awesome!
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