Spring curve marker

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Sources for this idea came from “Fine Woodworking” contributed by Floyd Lien and from Robert Wearing’s book, “Woodwork Aids & Devices”.
The spring is in its 3rd incarnation. It was cut from a logging saw to make a spring return for my hydraulic press, hence the notches. The chain is that sort which is used in bathrooms. It is strong enough to hold a reasonable tension, but if I wanted to form a sine curve with it, I would need something stronger. This makes it adjustable. If I wanted to repeat the curve, I would just mark the ball where it is inserted in the notch at the end.

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Thanks Philip Davies! We've added your Spring Curve Marker to our Measuring and Marking category,
as well as to your builder page: Philip Davies's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-spring-curve-marker"> <img src="/uploads/254419/homemade-spring-curve-marker.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-spring-curve-marker">Spring Curve Marker</a> <span> by <a href="https://www.homemadetools.net/builder/Philip+Davies">Philip Davies</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/marking'>marking</a>, <a href='https://www.homemadetools.net/tag/spring'>spring</a> </div> </div> </div> </div>
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Really cool idea. I'm forever struggling to find round objects with massive radii to draw around, so this will solve that problem nicely 😝 Thanks!