Objective: Produce one small sample that chains a finished seam, topstitching, and a buttonhole in the correct order on the Janome MC6650, planning your foot and stitch changes so the piece looks shop-ready.
Making sellable items means doing several learned techniques back-to-back without the piece losing accuracy. The key is working in the order a garment is actually assembled: construct first, finish/press second, detail last. On the MC6650 that translates to a repeatable rhythm. Start with the straight stitch (default stitch 1, standard foot A) to join pieces at your chosen seam allowance, using the needle-plate guide lines. Next, finish the raw edges with an overcast or zigzag (stitch and foot C) so the seam won't fray on a customer's item. Press the seam before any topstitching — the MC6650's flat stitches depend on flat fabric. Switch back to straight stitch for topstitching, moving the needle position (left/right buttons) to run an even line a consistent distance from the edge rather than eyeballing it. Save detail work like the buttonhole for last, because the automatic buttonhole foot R needs an undisturbed flat area and the machine's sensor reads the button length once; adding a button placket after construction keeps that area smooth. Group your changes: do all straight-stitch steps you can before swapping feet, so you minimize re-threading and tension resets. Use the machine's stitch memory or write your stitch numbers and settings on a sticky note for repeat production. The goal is consistency across copies, not just one good result.
Example: Make a sample button tab: Cut two rectangles 4cm x 10cm. 1) Stitch 1, foot A, 1cm seam — sew right sides together around three sides, pivoting at corners using the needle-down setting. 2) Trim corners, turn, press flat. 3) Stitch 1 again, needle moved to a right position, topstitch 3mm from all edges in one continuous path. 4) Switch to buttonhole foot R, select the one-step buttonhole, drop a 15mm button in the foot's holder, and sew the buttonhole 1.5cm from the finished end. Cut it open with the seam ripper against the pin-stopper. Result: a finished, topstitched, buttonholed tab combining three skills.
Try it: Using scrap cotton, make one button tab following the four-step sequence above. Before you start, write your stitch number, foot letter, and needle position for each of the four steps on paper. Sew it, then lay it flat and measure your topstitching distance at three points along one edge.