Replies

1. 
   forestgirl | May 29, 2009 08:47am | #1

   OK, guys, pull yourselves away from the He-said/He-said thread and help beltone out here.  I sure can't do it!

   forestgirl -- you can take the girl out of the forest, but you can't take the forest out of the girl ;-) 
   
2. 
   WillGeorge | May 29, 2009 01:13pm | #2

   Why not cut just one with your ideas? And go from there!

3. 
   knuts | May 29, 2009 03:12pm | #3

   I haven't made any pyramids but I have made a bunch of cedar flower pots with this taper jig, 6 & 8 sided. You'll find quite a few charts & calculators for compound cuts on the 'net.

   Here's one:

   http://www.delorie.com/wood/compound-cuts.cgi?nsides=3&angle=60

   View Image

   I mark one piece for setting the fence, then cut all the rest from that.

   However, with an angle of 40.9 deg, I don't think this jig(works in both miter tracks) is wide enough for really big pieces.

4. 
   saschafer | May 29, 2009 03:55pm | #4

   What are the overall dimensions?

   -Steve

    

1. 
   beltone | May 30, 2009 03:17am | #5

   7.5 inches tall, 7.5 inches wide at the base and 4.5 inches wide along the top, four sides of course.

1. 
   saschafer | May 31, 2009 06:20am | #6

   I'm going to assume that the grain is going to run vertically, so when I say "length," I mean the distance from the base of the pyramid to the top.The slope of the sides of the pyramid is going to be 11.3°. (This is what would be the "spring angle" if we were talking about crown molding.) So you will need to cut this angle on the top and bottom ends of the side panels.The length of the side panels is 7-21/32". Remember, though, that since the ends are beveled at 11.3°, you'll have to rough cut the pieces a bit longer than this.You can make the remaining cuts with the pieces flat, on a table saw or sliding compound miter saw. The miter angle is 11.1°, and the bevel angle is 43.9°.The miter angle isn't critical, but the bevel angle is. Do a dry run on some scrap, and tweak the bevel angle as required: If the miters are open on the inside, decrease the bevel angle. If the miters are open on the outside, increase the bevel angle.-Steve

5. 
   Cincinnati | May 31, 2009 06:42am | #7

   Do you have a bandsaw?

   Depending on the size and geometry:

   Cut one side. Tape it back in place. Cut the adjacent side. Repeat until 3 or 4 sides have been cut. Is it a triangular pyramid or a rectangular pyramid?

    

   Greg

   •••••••

   Exo 35:30-35

6. 
   Cincinnati | May 31, 2009 06:47am | #8

   OK Now I see it's a rectangular pyramid. Are you building a shell, or a solid pyramid? I was thinking it would be a solid pyramid. That's why I made the bandsaw recommendation.

   Greg

   •••••••

   Exo 35:30-35

7. 
   MikeHennessy | Jun 01, 2009 02:23pm | #9

   Radial Arm Saw. Easy Peasy.

   Mike Hennessy
   Pittsburgh, PA
   Everything fits, until you put glue on it.