Fence set-out tool
Give it a span, a paling width, and roughly the gap you want. It spaces the palings evenly, draws the layout to scale, and gives you a list of marks to measure straight off the post.
Result
Palings needed
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Actual gap
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Prefer a different count? Pick one
Layout — to scale
Marking list — measured from the left post
| Paling | Leading edge | Centre | Trailing edge |
|---|
Measure every mark from the same end (the left post) with a long tape — that keeps small errors from stacking up across the run. The red leading edge column is the one to mark: hold your pencil there and set the left side of each paling to the line. Numbers are shown to the nearest 0.1 mm.