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Digitizing Fundamentals VII

Digitizing Fundamentals VII Embroidery Project

By   James M. (Jimmy) Lamb   on   October 01, 2005
Description

Push/pull compensation

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Push/pull compensation

During the sewing process, certain areas of a design may shift in position, change shape or change size. This is known as PUSH and PULL.

To understand push-pull, you must be very familiar with the stitch formation process. When a stitch is formed, the bobbin thread “pulls” down on the upper thread. If the fabric is stiff, the amount of “pull” is very minimal. Soft, stretchy fabrics allow more upper thread to be pulled down, resulting in segments that are narrower than intended.

Other factors include, type of stitch, size of segment area, amount and type of underlay, density, and thread tension.

Consider these facts about push-pull:

  • Longer stitches tend to pull IN from the edges.
  • Unstable fabrics, such as knits cause shifting and pulling in of stitches.
  • Larger areas of coverage are more susceptible to push-pull effects.
  • Thick fabrics cause more distortion than thin ones.
  • Tight bobbin tension will cause more inward pull.
  • Proper underlay is the key to reducing the effects of push-pull. A heavy, lattice type of underlay is ideal for circles and ovals. If pulling in at the edges still occurs, then it may be necessary to compensate for this by extending the top stitches where they pull-in.

    The diagram on the left illustrates underlay. The diagram on the right illustrates the technique for compensating against pulling. The inner circle outline represents the desired shape. The outer ring represents the way the image is digitized, such that the plotted stitches are wider than the desired image in anticipation of the stitches being pulled inward during sewing.

    Meet the Author: James M. (Jimmy) Lamb
    James M. (Jimmy) Lamb
    Award-winning author and international speaker Jimmy Lamb has over 15 years of embroidery experience as well as 10 years of professional digitizing experience (as a business owner). Currently, he is the Director of Training and Education for Hirsch International Corp., where he has been instrumental in developing their educational seminars.
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