View Full Version : obelisk
05-22-2004, 11:46 AM
I'm planning on building a display case with an obelisk top, the case is 20" square, with the obelisk taking off from the top at 45 degrees. I'm looking for a formula to determine what the compound miter cuts will be. Thnx in advance!
05-22-2004, 12:47 PM
After some looking around the net, it appears that it's a 35.3 degree angle.... (still would like to know the formula though, if the bottom angle is anything other than 45 degrees...)
05-22-2004, 09:22 PM
Have you got a pic someplace? I'm having a hard time getting this in my head. 20" square base with the the edges of the obelisk coming up at 45 deg? I keep getting a pyramid shape in my head.
05-23-2004, 12:35 PM
You've got the right vision of it, think of the Washington monument; built out of wood.... the front having a glass hinged door, with a can or eyeball light shining down from inside the obelisk.. (The monument's obelisk 'takes off' with a much steeper angle than 45 degrees)
05-23-2004, 09:27 PM
Not knowing any better, and being too lazy to get my geometry reference & engineering books down offa' the shelf & dig through 'em for half an hour, I'd rapid-guess that the compounded bevel angle would be half that of the base angle - predicated upon the supposition that any two adjacent sides rise at the same angle.
Best way to know for sure, I think, might be to make practice cuts on a couple of scraps & mock up the cut, adjusting till it's right. Then measure & lemme know if my WAG was anything close to right... :)
-- Tim --
I'm too young to feel this way,
But I'm too old to think this way.
06-02-2010, 09:11 AM
Here's a rough sketch (very rough....)