What is SPI in stitching?

How do you calculate stitches per minute?

Stitches Per Minute or Sewing Head RPM:

The stitches per minute is how fast the head is rotating with every rotation making a single stitch. To calculate the stitches per minute divide the motor rpm by your reduction ratio.

What is SPM in sewing machine?

SPM – Stitches per minute is the speed of a machine which can be considered as if you want the high-speed machine. The basic design from Usha, brother and singer brand offers 600 SPM as basic speed which is reliable to get strong stitches.

How do you calculate strength of a stitch?

Take the number of stitches per inch times the strength of your thread times the ratio 1.5 (the average loop strength of thread on lockstitch sewing machines) to determine your seam strength in pounds per inch of sewing.

What is stitching margin?

Margin is the seam provided inside the garment after the stitching edge / line which gives the flexibility for any kind of alteration in future.

What is stitch density?

Stitch density is the distance between stitch lines traveling in the same direction. The lower the number and/or percent, the closer the stitch lines are. The higher the number and/or percent, the further apart the stitch lines are.

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Which SPI means long stitches?

Garments with a low SPI are typically less durable, have long stitches and are more prone to snagging. The main advantage of a low SPI in garments is that sewing requires less thread. As a result, it’s often faster and less expensive to produce garments with a lower SPI.

Why do my stitches skip?

Skipped stitches are usually caused by an old or worn needle. With every stitch, there is friction placed on the point of the needle and with repeated action, the needle experiences abrasion. Over time, the needle becomes dull and doesn’t perform well. This results in skipped stitches.

Which stitching machine is best?

Find out the 10 best-selling sewing machines currently available in India

S No. Product Name
1 Usha Janome Dream Stitch Automatic Zig-Zag Electric Sewing Machine
2 Singer Start 1306 Sewing Machine
3 Usha Janome Wonder Stitch Automatic Zig-Zag Electric Sewing Machine
4 Brother FS 101 Computerized Plastic Sewing Machine