My mother just gave me an amazing Singer Sewing Book, so I'm stoked to be able to share what it says. I tried scanning the pages but found it lacked sufficient detail, so I'll post photos of the illustrations along with the text. You can click them to enlarge.
p. 92-93 on Bound Seams:Open Bound Seam
Binding is an excellent finish for fabrics that tend to fray, such as tweed and heavy, coarse weaves, as well as for unlined jackets and coats....
Form a plain seam. Press the seam, then press it open. With the Binder on the machine and silk bias seam binding, bind each seam edge, using either straight stitching or an open zig-zag stitch.
To prevent seam edges from stretching or fraying in loosely woven fabrics, place a row of stitching 1/4 inch from the seam edge before applying the binding. Net Bound Seam
Delicate fabrics that fray easily, such as chiffon velvet, and sheer metallic, may have seam edges bound with nylon net, which prevents fraying without adding bulk.
Cut the net into 1/4-inch strips and insert, unfolded, into the Binder. Feed seam edges into the Binder with napped or right side up. Stitch, using a medium-width zig-zag stitch.Plain Bound Seam
This seam is practical for household items such as cushions, simple slipcovers, and articles made of plastic.
After stitching a plain seam, trim the seam edges to a scant 1/4 inch. Press. Insert both edges into the Binder and stitch, keeping the seam edges well into the scroll as you sew.
p. 282-283 on Using the Binder:Binder
The Binder is used to apply commercial binding or self-fabric bias to an unfinished edge. Binding is a suitable finish for seam and hem edges that fray easily and a pretty trimming for ruffles, aprons, children's wear, curtains, and novelty items. Straight or zig-zag stitching may be used with the Binder.
Cut the binding diagonally to form a long point at the end. Insert the point in the slot in the Binder and pull it through the scroll until the evenly folded binding is under the needle. Stitch just far enough to place the stitching close to the edge. To do this, move the scroll to the right or left. Do not pull the binding as it feeds through the scroll. Do not raise the presser bar after the stitching is in the correct position.
Insert the edge to be bound as far to the right as it will go in the center scroll, and stitch. Inside Curves
are straightened as they are fed into the Binder. If the fabric is soft and has a tendency to stretch, reinforce the edge with a single row of stitching before binding.Outside Curves
tend to lead away from the scroll. Guide the fabric to the left in line with the needle so that the full seam width is taken. Do not attempt to pull or straighten the fabric into the full length of the scroll.When rickrack braid
is applied to an edge as it is bound, insert the edge and rickrack into the Binder at the same time, keeping the edges flush.
Book info (if you are interested) is:Singer Sewing Book: The Complete Guide to Sewing
(Revised Edition). Jessie Hutton & Gladys Cunningham. Golden Press, New York: 1972.
Hope this helps!