SINGER W8910 - Manual (Page 25)

Sewing guidance
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If you want to sew seams with the seam allowance
pressed open, the following generally applies:
Non-stretch fabrics, leather and vinyl are sewn with
straight stitching. When sewing light and other stretch
fabrics, choose the reinforced straight stitch.
When you have joined the fabric pieces, press the
seam allowances open. To obtain an even seam allo­
wance, use one of the marking on the stitch plate or the
edge guide.
It is usually best to simultaneously join and overcast
stretch fabrics. This is described on page 24.
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Overcasting
It is necessary to overcast the seam allowance on some
fabrics to prevent fraying. It is easier to overcast the
edges of each fabric piece separately before sewing the
garment together.
Three-step zig-zag (2) is the most commonly used
overcasting stitch and the machine automatically selects
the stitch width and length according to the characteris­
tics of the fabric.
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It is not normally necessary to overcast leather or
vinyl but if so, use ordinary zig-zag (1).
Trim the edges before overcasting. Be sure the needle
covers the edge of the fabric entirely. With the basic
setting, allow the fabric edge to run along the right inside
edge of the presser foot.
Presser foot J is fitted with a pin on the right-hand side
to prevent the fabric from puckering.
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