A Quilty Kind of Girl

March 2, 2010

Tutorial Tuesday – Quarter Inch Accuracy

Filed under: QuiltersDaily Blog Along — quiltcetera @ 1:00 am
Tags: ,

One of the most common questions I get from quilters is “How do I get my blocks to finish the proper size?” Most of the time, quilters are using their quarter inch presser foot, but for some reason, the piecing is not accurate. I’ve put together a series of photos to illustrate what can go wrong when piecing and how to solve the problem.

2.5 inch strips of fabric

Here are two strips each measuring 2.5 inches wide.

Two strips sewn together.

I've sewn both strips together using my quarter inch presser foot. The width of these two pieces should measure 4.5 inches.

Measuring the width of the strips.

When measured, these strips are only 4 3/8 inches wide. What went wrong?

Measuring the seam allowance.

After measuring the seam allowance, I can see that it is just slightly more than a quarter inch. Could that really make a difference?

Side view of the strips.

Here you can see how my pressing did not quite flatten the fold as well as it could have.

Ripped stitches.

Since this seam needs to be 'unsewn' or frogged (rip it, rip it) I will pick every third stitch on one side of the piecing.

Ripped stitches, view of other side.

The thread on the other side of the piecing should pull away in one long thread, allowing me to separate my fabrics.

Using a ruler to measure my quarter inch.

When I measure the seam allowance, at first glance, it looks as though it is accurate. But look closely at the right side of the ruler. See the tiny, tiny gap between ruler and metal guide. That is the excess. The needle position needs to be moved slightly to the right, closing up that wee gap.

An accurate quarter inch, measured.

Once I've moved the needle position just a thread to the right, I sew my seam again. See how it is just one thread under a quarter inch? This is called a scant quarter inch and it is ideal for quilting.

An accurate 4.5 inch measurement.

Checking my measurement shows the piecing is accuarately 4.5 inches wide.

Side view of pressing.

This time, I pressed the fabrics to lay flat, contributing to the accuracy of the piecing.

Quilters Daily Blog Along

The needle position of most sewing machines is adjustable. Dig out your manual if you are not sure how to move the needle position. Move the needle one fraction at a time, and use the hand crank to slowly lower your needle to the down position. Make sure the needle does not impact with your presser foot, as this can be very dangerous when sewing. Keep your ruler handy to measure the distance between the needle and the guide.

** EDIT ** This comment was left regarding moving your sewing machine needle. Anne has shared an excellent point that I would like to share with all of you.
“Your photography does a great job of demonstrating what you are explaining. Thanks for taking the time to do it so well. I usually piece with a straight stitch plate, so folks should be careful when moving their needle over. Test it by hand first to see that you have the clearance otherwise use the zig zag plate. I can’t tell you how many times I’ve forgotten about having the SS plate on while in the throes of an exciting creative brainstorm. I’ll switch to a decorative stitch and then BAM! The needle explodes into pieces while I have a heart attack hoping my machine is ok!” Thanks very much Anne!

Now for those of you who were asking about more intricate seam nesting, Rachel over PS.IQuilt has done a tutorial for Half Square Triangles, plus she shows a neat little trick to reduce the bulk in a pinwheel block. Head on over to her blog to see how she does it.

Quilty Hugs,

P.S. We are now the Official Canadian Retailer of Christopher Nejman’s brand new CD Book CELEBRITY BAGS.

Take advantage of our pre-order event before we start carrying stock later this month and receive free shipping anywhere in Canada.

Bradie

Don’t forget to visit Fabric Heaven!

19 Comments »

  1. thanks for the link.
    πŸ™‚

    Comment by rachel — March 2, 2010 @ 7:11 am | Reply

  2. We all knew this but thanks for the reminder, Bradie. Good tips

    Comment by Barb Few — March 2, 2010 @ 8:01 am | Reply

  3. Nicely done Bradie. Sure to be helpful for many beginners. Since I couldn’t move my needle, I ended up removing the guide on my 1/4″ foot. Much, much happier with the results now.

    Comment by Michele — March 2, 2010 @ 9:14 am | Reply

  4. This reminder is one that I need often. Thanks!!

    Comment by Jean — March 2, 2010 @ 12:36 pm | Reply

  5. […] Bradie’s posted a really great beginner tutorial on Quarter Inch Accuracy. […]

    Pingback by Back to Basics: That 1/4″ Seam / Quilting Gallery — March 2, 2010 @ 3:05 pm | Reply

  6. This is great for veteran quilters too! It reminds us to check our quarter inch for accuracy everytime! I still have trouble with that quarter inch.
    Fabric weight can add to the problem too. Batiks are heavier than some other 100% cottons and when you press there is more bulk.
    Thread weight can make the difference as well. All these things I know but in my haist I forget.
    One thing that has helped me as well is I am trying to slow down and enjoy the process. I put my machine on slow (I have a speed regulator on my machine) listen to a podcast and go with the flow.
    Thanks for the reminder. Now I am going to check, check, check……

    Comment by Jo Vandermey — March 4, 2010 @ 7:44 am | Reply

    • You are so right Jo. In fact it was my own mistakes that inspired this post. Thanks for the info on fabric and thread weight too.

      Comment by quiltcetera — March 4, 2010 @ 11:03 am | Reply

  7. Okay, GREAT tutorial! I just finished a table topper and of course since I cut everything first, it was a surprise to see the borders were too small, but an inch! I ended up adding that inch, but how annoying. I’m going to start working on three new quilts, so I am going to measure on the first few until I get the hang of it. I thought my skant 1/4 was good…but I think it’s too big now that I see it is a thread smaller. Just a thread! LOL That’s crazy.

    Comment by Tsoniki Crazy Bull — March 4, 2010 @ 2:06 pm | Reply

  8. ME ENCANTO ESTE TUTORIAL MUY DIDACTICO

    GRACIASSSSSSSSSSSSSSS
    BESOSSSSSSSSS HASTA PRONTO

    Comment by claudia — March 11, 2010 @ 3:06 pm | Reply

  9. Your photography does a great job of demonstrating what you are explaining. Thanks for taking the time to do it so well. I usually piece with a straight stitch plate, so folks should be careful when moving their needle over. Test it by hand first to see that you have the clearance otherwise use the zig zag plate. I can’t tell you how many times I’ve forgotten about having the SS plate on while in the throes of an exciting creative brainstorm. I’ll switch to a decorative stitch and then BAM! The needle explodes into pieces while I have a heart attack hoping my machine is ok!

    Comment by prima — March 17, 2010 @ 1:26 pm | Reply

    • Thanks for your comment! You’ve raised an excellent point, and I’ve added your feedback into the post. πŸ™‚

      Comment by quiltcetera — March 17, 2010 @ 1:32 pm | Reply

  10. […] to make sure the thread doesn’t steal valuable space within the seam. Adjust your needle and gauge your presser foot accordingly to come out with an accurate 1/4 inch each and every time you are using your favorite […]

    Pingback by An update on thread weights and seam allowance « A Quilty Kind of Girl — March 18, 2010 @ 7:15 pm | Reply

  11. I am a novice, and now I understand why my first patchwork quilt is not matching up throughout the majority of it. Oh well, it’s my first quilt, so of course it’s a practice quilt (and boy, does it look it!) but I still don’t really understand the true MEASUREMENT of a scant quarter inch. Is it more like .5 cm (consider that a centimetre is slightly smaller than a half inch, thus .5 cm is slightly smaller than a quarter inch)?

    Linda

    Comment by Linda — October 6, 2011 @ 7:13 pm | Reply

  12. Thank You for your pictures as You had told us during your instructions. Now I am confident in measuring for a scant quater inch. Now I know who to talk to, when I have questions in sewing. Again, Thank You A lot.

    Comment by Tammie — January 10, 2013 @ 9:00 am | Reply

  13. […] Tutorial Tuesday – Quarter Inch Accuracy […]

    Pingback by Improving Quilting Accuracy and Quilt-Along Cutting Instructions / Quilting Gallery — June 20, 2013 @ 4:59 pm | Reply

  14. […] There are actually several great tutorials already out there on that, so I’m going to link to those today: Gen X Quilters: Scant Rant: A 1/4″ Seam Tutorial Gen X Quilters: Scant Rant, Part 2 Quiltville: That Quarter Inch! Diary of a Quilter: Quilting Tip: Scant 1/4 Inch A Quilty Kind of Girl: Tutorial Tuesday- Quarter Inch Accuracy […]

    Pingback by Tuesday Tip! The Scant Quarter Inch Seam | Ormond Beach Quilts — October 26, 2013 @ 8:10 am | Reply

  15. […] Tutorial Tuesday – Quarter Inch Accuracy […]

    Pingback by DS QAL: Tips for Improving Quilting Accuracy / Quilting Gallery — January 7, 2014 @ 9:31 pm | Reply

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    Comment by Johne270 — May 23, 2014 @ 8:17 pm | Reply


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