How to Baste 1 Inch Quarter Circles for Crisp Curves

Quick answer

Baste 1 inch quarter circles by securing the fabric to the paper template, then folding the curved edge over the seam allowance with small, evenly spaced stitches or a thin line of glue. Work from the center of the curve outward, clipping the seam allowance only if the fabric puckers. Use 1/4 inch seam allowance for most EPP projects and 3/8 inch for applique.

Why quarter circles need a different basting approach

Quarter circles have one straight edge and one curved edge. The straight edges behave like any other EPP shape, but the curve demands extra care. If you baste the curve too tightly, the fabric distorts; too loosely, and the curve won't hold its shape when you sew pieces together. The goal is to wrap the fabric smoothly around the curve without stretching it.

Unlike hexagons or diamonds, quarter circles are often used in applique and circle-based variations, where the curved edge may remain visible. That means your basting directly affects the final look. Whether you glue baste or thread baste, keep the fabric snug but not taut.

Choosing your basting method: glue vs. thread

Glue basting is faster and works well for small pieces like 1 inch quarter circles. A thin line of water-soluble glue along the seam allowance holds the fabric in place until you sew. Thread basting is slower but gives you more control over the curve and is reusable if you don't glue through the paper. For curves, many makers prefer thread basting because it allows you to adjust tension as you go.

If you plan to reuse your paper pieces, thread basting is the better choice. Glue can leave residue that makes paper templates sticky and less durable. However, if you're basting many identical pieces, glue basting saves time. Try both on a few pieces to see which gives you the crispest curve.

Step-by-step: thread basting a 1 inch quarter circle

Thread basting a curve requires small stitches and patience. Start with a knotted thread and bring your needle up through the fabric and paper at the center of the curved edge. Fold the seam allowance over the paper and take a small stitch through the fold, catching just a few threads of fabric. Continue along the curve, keeping stitches about 1/8 inch apart. At the ends, take an extra stitch to secure the corner. Don't pull too hard—the fabric should lie flat against the paper.

Common mistake: stitching too close to the edge. That can cause the fabric to fray and the curve to lose its shape. Keep your stitches slightly away from the raw edge. Checkpoint: after basting, press the piece with a dry iron on a low setting. The curve should hold its shape without any ripples.

Step-by-step: glue basting a 1 inch quarter circle

Glue basting is straightforward: run a thin line of water-soluble glue along the seam allowance on the paper template. Fold the fabric over, starting at the center of the curve, and press with your fingers. Work outward to the ends, smoothing the fabric as you go. Use a small clip or pin to hold the ends if needed. Let the glue dry completely before sewing.

Common mistake: using too much glue. Excess glue can soak through the fabric and make it stiff. A little goes a long way. Checkpoint: after drying, the fabric should be firmly attached but still flexible. If the curve looks wavy, remove the fabric, wipe off the glue, and try again with less glue.

Sewing curved seams: joining basted quarter circles

Once your pieces are basted, sewing curved seams requires a different technique than straight seams. Align the curved edges with right sides together, matching the center of the curve first. Pin or clip at the center and at both ends. Sew with a small stitch length (about 1.5 mm) and a scant 1/4 inch seam. Don't pull the fabric as you sew; let the feed dogs move it naturally. If the curve is tight, you may need to clip the seam allowance slightly, but with 1 inch quarter circles, the curve is gentle enough that clipping is rarely necessary.

Common mistake: sewing too fast. Slow down and adjust the fabric frequently to keep the curves aligned. Checkpoint: after sewing, press the seam open or to one side. The curve should lie flat without puckers.

Your basting workflow: step-by-step

1. Prepare your paper pieces and fabric: Cut fabric squares large enough to cover the 1 inch quarter circle plus seam allowance. Use a light box or template to center the paper on the fabric. Checkpoint: fabric should extend at least 1/4 inch beyond the paper on all sides.
2. Baste the straight edges first: Fold one straight edge over the paper and baste with a few stitches or a thin glue line. Repeat for the other straight edge. This anchors the piece before tackling the curve. Checkpoint: straight edges should be smooth and flat against the paper.
3. Baste the curved edge: Starting at the center of the curve, fold the seam allowance over and baste outward to each end. Use small stitches or a thin glue line, keeping the fabric snug but not stretched. Checkpoint: the curve should be smooth with no pleats or puckers.
4. Press and check: Press the basted piece with a dry iron on low heat. Inspect the curve from both sides. If it's wavy, remove the basting and try again with less tension. Checkpoint: the piece should lie flat and hold its shape.
5. Join pieces with curved seams: Align curved edges right sides together, pin at center and ends, and sew slowly with a scant 1/4 inch seam. Press seam open or to one side. Checkpoint: seams should be smooth and curves should nest without bulk.

Paper Pieces products for quarter circle projects

• 1" Quarter Circles: 1" Quarter Circles paper templates are available in Small Pack, Large Pack, and Bulk Pack, with 1/4" or 3/8" seam allowance options. Choose the seam allowance that matches your project: 1/4" for standard EPP seams, 3/8" for applique where you need more fabric to turn under.
• Antique Garden by Paper Pieces®: Antique Garden by Paper Pieces® is a miniature quilt pattern made of Grandmother's Flower Garden rosettes, a light hexagon path, and coordinating background units. This pattern uses curved and hexagonal pieces, making it a good next project once you're comfortable basting quarter circles.
• 4" Quarter 6 Point Diamonds: 4" Quarter 6 Point Diamonds and Acrylics are sold separately; paper pieces and acrylic templates are available as separate options. If you prefer acrylic templates for cutting fabric, you'll need to purchase them separately from the paper pieces.