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How the Hardware Calculator Works It's a secret, but here are some of the parameters: We haven't really talked about the Top Border of your shade. But you have one. Even if you are only using one fabric for your shade. The term originated when I began making pieced Roman shades, with rows of quilt blocks and four borders. What I realized was that you needed for the Top Border to be at least as long as the Headrail (board plus all hardware). The Top Border is that part of the shade that covers the mounting hardware. It can be "longer" than the mounting hardware, but it can't be shorter.
The schematic below shows typical Headrail configurations. You will be using a Flat Installation or a Projected Installation. By adding up the length of the board and the length of the pulley, you get the Headrail length.
Using Flat Pulleys and a Cord Lock
The Hardware Calculator assumes a set value for the Top Border. This value is larger if you are using a Cord Lock Pulley. It then uses the Shade Finished Length and your Ideal Stackage to calculate the "best" fold depth. This is defined as the largest fold depth to achieve your requested Stackage. You should play around with the Calculator. Try making your Stackage 1" or 2" longer. See what happens if you use battens (you can space your lift lines much further apart).
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Examine the illustration above and the photograph to the left and you will see
that the shade can only be pulled up to the bottom of the Headrail. The Headrail
includes the mounting board and the pulleys (or screw eyes or cord lock). If you
don't account for the "length" of the Headrail when you design your
shade, it will not fold up completely.
