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Underlay, Edgewalk and Centerwalk.
Set your preferred default values for Underlay, Edgewalk and Centerwalk by clicking "View/Underlay". These are the settings the program will use any time you select underlay for a fill. The program will apply them to each form you use underlay with until you change the settings here again. After you have filled a form, you can change the settings for that individual form in the Form Data box ("F").
Underlay is a light layer on all designs, but it is best to begin at a fairly large number. The default fill spacing in Thred is now set at .45. This will be too sparse to suit some users, but it is better to begin with a light fill and add stitches only as needed. Do not be fooled by what you see on the computer screen. Test stitch. The only way to really know how it will look with the thread,fabric and stabilizer combination you have selected is to test it.
Underlay stitches give your design stability. All embroidery designs benefit from at least an edgewalk, but most fills need an under layer of stitches that run the opposite direction to the fill stitches and hold the fabric in place while the fill is stitched. A light fill with a light underlay will often cover the fabric much better than a heavy fill with no underlay at all. If the fill is dense, the threads that support it begin to move, making the fill threads sit at an angle to their neighbors, which causes gaps. It is always preferable to keep the stitch count in your design down as much as you can manage, but underlay is not the place to sacrifice stitches. Also, it is best to starch and iron the fabric before you begin to stitch.
Edgewalk is a line of stitches that travel around the inner edge of your fill area, underneath the fill stitches. Edgewalk stitches help to keep satin fills from pulling up the fabric, and also make the satin stitches stand up for a fuller effect.
Centerwalk is a line of stitches up the center of the fill.
You may use all three kinds of underlay in one form, but there are not many situations when that is really necessary.
Thred will automatically make underlay for a filled form. Here is a filled heart form as an example:
Select a form and fill it. While the form is still selected, press the "F" key, or click the word "Form"across the top menu. The data box pops up.
When you click the word "off" next to the word Underlay, it changes to on. The stitches change,and the data form changes. This example is shown with no Indent. The underlay below extends to the edge of the fill. This is not really desirable, since it may tend to show at the edges of the design. The next lesson shows how to use "Indent" to change that.
Stitch length, spacing, color etc. can be changed by changing the entry in the form. The color for the underlay should be the same as the stitches, or the color of the fabric. Most people will prefer to keep them the same since that eliminates a color stop.
The same Stitch Length and Indent number applies to all underlay, edgewalk or centerwalk in the form. They have to be the same. You can't have an underlay with a stitch length of 3 and in the same form a centerwalk with a fill spacing of 2.