How To Draw A Large Arc
Marking large-radius arcs
The trouble with marking a line with but a slight curve to it is that if yous want to describe it with a compass-like contraption, the center of the circular arc ends upward so far abroad that information technology becomes awkward if not impossible to do. Even if you lot have enough room, a many-meter long beam compass is awkward, and a pencil on a string is imprecise because the string stretches also hands.
For lightly curving arcs, information technology's easiest to simply strength a thin strip of wood into an arc. In this photograph I have a sparse strip bent to roughly a circular arc. A small spacer and a C-clench on either cease apply angle moment to the ends of the strip. With the angle moment applied at the very ends, the angle moment is the same along the length of the strip, resulting in an even rate of curvature along the length. The resulting arc is very shut to circular.
It would exist easier to just put a big spacer in the middle instead of two pocket-sized ones near the clamp, only if y'all do that then the ends of the arc stop up with less curvature than the center, so the arc is much less of an approximation of a circle.
An advantage of this technique is that you can just concord the arc shape upward to your work piece and make sure that it lines upwards with everything, and just then trace it out with a pencil.
Some other method
Phillip Grow sends me this method:
Drive a smash at each stop of the desired arc. And then attach two straight strips of wood to each other at an angle. Trace your arc with a pencil positioned at the intersection of the strips, sliding the strips and the pencil along both nails. To set the angle of the two pieces of forest, agree the pencil at the desired midpoint of the arc and attach the strips of wood to each other so that they both affect the pencil and the nails.
A bully belongings of this method is that the bending covered by the arc is exactly equal to twice the alter in angle between the 2 strips of woods. To make an arc that covers xc degrees for case the angle between the strips should exist 135 degrees (180 - ninety/2).
For very shallow arcs, I prefer the first method though.
Source: https://woodgears.ca/shop-tricks/large_arc.html
Posted by: rosstooll1958.blogspot.com
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