Objective: Choose the right stitch pattern for piecing and quilting on the Janome MC8200 and apply the core consistency habits that make quilts sell.
On the MC8200, patterns are selected from the touchscreen. For quilts you mostly need three: the straight stitch (pattern 1) for piecing blocks and for straight-line quilting; the zigzag (pattern 2) for appliqu\u00e9 edges and finishing raw edges; and the machine's dedicated quilting/stitch-in-the-ditch straight stitch at a slightly longer length. For piecing, the single most important best practice is an accurate 1/4-inch seam allowance\u2014install the 1/4-inch foot (O or the acrylic quarter-inch guide) and set stitch length to about 2.0\u20132.2mm. For quilting the finished sandwich, lengthen to 2.5\u20133.0mm so stitches sit nicely over the loft of the batting, and use a walking foot to feed the three layers evenly and prevent the top from shifting. Because this is for resale, consistency beats speed: use the needle-down function (set it on the screen) so pivots at corners stay clean, engage the speed-control slider at a medium setting until your hands are steady, and keep tension near the default (around 4) unless a test swatch tells you otherwise. Always stitch a test swatch on the same fabric and batting before touching the real quilt\u2014this reveals tension and puckering problems while they are still free to fix. Start and secure seams with the lock-stitch button rather than long backstitching to keep the back tidy, which customers notice.
Example: You are piecing a two-fabric nine-patch for a lap quilt. On the touchscreen you tap the Utility stitches menu and select pattern 1 (straight). You set stitch length to 2.0mm, snap on the 1/4-inch foot, and turn on needle-down. You sew a 4-inch test seam, press it open, and measure: the seam allowance is exactly 1/4 inch and the fabric lies flat with no puckers. You then chain-piece all nine squares without cutting threads between them, saving time and thread. Later, to quilt the finished sandwich, you switch to the walking foot, lengthen the straight stitch to 2.8mm, drop the feed evenly, and stitch in the ditch along the block seams at a steady medium speed.
Try it: Set up your MC8200 and sew two test swatches on scrap quilting cotton. Swatch 1: select the straight stitch, attach the 1/4-inch foot, set length to 2.0mm, and sew a seam joining two 3-inch strips. Press it and measure the seam allowance with a ruler. Swatch 2: layer two fabrics with batting between, attach the walking foot, set the straight stitch to 2.8mm, turn on needle-down, and sew one straight line. Inspect the back for even stitches and the top for puckering. Write down your measured seam allowance and note any adjustment you had to make.