A blind hem can fail in opposite ways: the sideways stitch misses the fold, or it catches so much that the stitches are obvious outside. The aim is a small, secure bite into the folded garment, while the other stitches stay in the hem allowance.
The fold is part of the mechanism
Finish the raw edge appropriately, turn up the intended hem, then arrange the temporary fold shown in your machine’s blind-hem instructions. The guide rides beside that fold. Simply placing a normally folded hem under the foot does not create the required geometry.
Singer’s illustrated blind-hem instructions show the relationship between the guide, fold and sideways stitch. Use the permitted foot and stitch for your model; the article’s automatic-tension setting is not a universal setting for other machines.
| After unfolding the sample | What it tells you |
|---|---|
| The hem falls open between stitches | The sideways bite may be missing or barely catching the fold. Check guide position and the permitted width adjustment. |
| Large stitches show on the garment face | The bite may be too deep. Reduce the amount caught while keeping the hem secure. |
| The hem pulls or puckers | Check whether the sample lies relaxed and whether the documented stitch setup suits its thickness. Do not solve this by pulling the fabric. |
Make the test worth keeping
- Use a scrap with the same hem depth, raw-edge finish and number of layers.
- Sew a short section slowly, then unfold it and view it from the right side.
- Inspect whether the hem is held, whether the visible stitches are acceptable and whether the fabric hangs without pulling.
Keep the successful sample beside the garment. A change in fabric thickness can change how the fold meets the needle, even with the same dial settings. The length and width guide explains the separate adjustments; this hem test tells you which result you actually need.
If appearance is critical, judge it under the lighting in which the garment will be worn. “Blind” describes the intended discreet finish, not a promise that every thread and fabric combination becomes invisible.
