BM-3600 sewing machine The BM3600 is perfect for both novice and experienced sewers. The machine offers a wide selection of stitches, an automatic needle threader and a quick set bobbin system to make threading convenient for you. For easy buttonhole sewing, the machine is equipped with a 1-step fully automatic buttonhole function to save you time and as featured on all Brother sewing machines the free arm is ideal for sewing cuff sleeves and tubular projects.