Objective: Consolidate the beginner skills from Unit 2 into one deliberate practice routine so that sewing straight, turning corners, and anchoring seams become automatic before you take on sellable items.
Confidence on the MC6650 comes from repetition under slightly varied conditions, not from a single lucky seam. In this lesson you turn scattered practice into a repeatable drill and a saved reference sampler. Work on a doubled layer of woven cotton (a 10 x 30 cm strip folded is ideal) so your results mirror real seams. Set a straight stitch, length 2.5 mm, and use the needle-up/needle-down button so the needle stops in the fabric for pivots. Keep your fabric edge aligned to the 1.5 cm (5/8") seam guide etched on the needle plate rather than watching the needle; your eyes should track the guide, letting the machine feed the fabric at a steady medium speed. The five drills to master are: (1) a straight seam with lock stitches at both ends, (2) a 90-degree pivot corner (stop with needle down, lift presser foot, rotate, lower foot, continue), (3) a gentle curve sewn slowly with frequent tiny pivots, (4) sewing parallel topstitching lines 6 mm apart using the foot edge as a guide, and (5) a backstitch-anchored seam using the reverse button. After each drill, judge three things: tension (top and bobbin threads should interlock in the middle of the fabric with no loops on either side), straightness (the line stays a consistent distance from the edge), and anchoring (ends don't pull apart when tugged). Label each sample with the stitch settings in pencil or washi tape and keep them clipped together. This sampler becomes a diagnostic tool: next time a project seam looks wrong, you compare it to your known-good samples to spot whether it's tension, speed, or guide-tracking that slipped.
Example: Take a 10 x 20 cm cotton strip folded in half lengthwise. Sew a straight seam 1.5 cm from the folded-edge side: press the reverse button for 3 stitches to lock, release and sew forward to the end keeping the edge on the 1.5 cm guide, then reverse 3 stitches to lock again. Lift the foot, clip threads. Now flip to a fresh area and sew toward a marked corner; when the needle reaches it, tap needle-down, lift the foot, rotate the fabric 90 degrees, lower the foot, and continue. Inspect: if you see loops of top thread on the underside, your top tension is too loose, so raise the dial a notch and resew. A clean, straight, locked seam with balanced tension is your benchmark.
Try it: Cut four cotton test strips. Sew all five drills (straight with lock stitch, 90-degree corner, curve, parallel topstitching, backstitch-anchored seam). Label each with its stitch length and tension setting. Tug both ends of each seam to confirm the anchors hold, and mark any sample where tension or straightness was off with a note on what you'll adjust next time. Clip the finished set together as your Unit 2 reference sampler.