Make two arches out of 1/2" plywood and use blocks to infill.

Thanks. What's the best way to mark the arches? I want it like the one in the background

You could use cardboard to copy that and then transfer to the plywood.

That's an Ellipse.

For your situation get a piece of thin trim, stop, etc., spot some finish nails & bend until you get the result you are looking for.

I will try that this weekend. Thanks for the tips

1 x 6 framing?.

This could be helpful :thumbsup:

http://www.thisiscarpentry.com/2013/09/06/drawing-an-ellipse-the-string-method/

I believe that is a segmented arch. Only one radius involved, as far as I can see. Nevertheless, bending trim piece works great.

griz said:

That's an Ellipse. For your situation get a piece of thin trim, stop, etc., spot some finish nails & bend until you get the result you are looking for.

Click to expand...

I use Google sketchup. Draw the arc you want with the right dimensions. Then measure the height from the basr every 3". Transfer that layout to your plywood and connect the dots. I just used that method on a 14' and a 19' eyebrow arch. Much smoother than freehanding or trying to guess at it. You do eyebrows and ellipses by stretching a circle.
The string method works, but not really well on larger arches past 6 feet or so, the string has too much stretch to be consistent in my experience.

Yes, I don't want a skinny arch.

sunkist said:

1 x 6 framing?.

Click to expand...

nobody wants a skinny arch

The 2 we are doing are 13" wide, they look very good that wide.

Or you could hire a carpenter

http://www.finehomebuilding.com/item/14345/how-to-draw-an-arc-when-framing-an-arched-doorway

i recently used the "bending a piece of wood" method and the arch I ended up doing a lot of tweaking to get it perfect. I would have used the above method had I known it.