I need to draw an arc for a piece of trim. The end points of the arc are 5 feet
apart and the depth of the arc at the center point is 2 inches. What is the
radius of the circle?
There ought to be an equation for this that would be far superior to trial and
It was more fun to try to work it out for myself, but I just looked it
up and there is (of course) a more direct way to find it.
Radius = H/2 + W^2/8H
Where H = the height of the arc (2")
and W= the width of the base (60")
In our example that's:
2/2 + 60^2/8(2)= 1 + 3600/16 = 1 + 225 = 226
Hah! Now all I need to do is figure out how to draw an arc with an 18 foot
radius :-) I have a couple of ideas and will post pix of the process.
On Monday, April 15, 2013 10:14:29 AM UTC-5, Gramp's shop wrote:
feet apart and the depth of the arc at the center point is 2 inches. What is
the radius of the circle?
My sense of the physics involved tells me that that method will not
produce an arc of a circle. Will it matter? Might the resultant curve be
subtly nicer than a circular arc? That's up to the designer.
My plan exactly, Larry. I'm going to start with drilling screws into the waste
side of the end points and the top of the arc, attach a thin strip of one-by
with spring clamps and then add a couple of screws/clamps along the arc.
The other Larry
On Monday, April 15, 2013 11:43:27 AM UTC-5, Larry Blanchard wrote:
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.