How to Design This Lamp Base?

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Forum topic by tool_junkie posted 05-16-2013 03:37 AM 1077 views 0 times favorited 2 replies Add to Favorites Watch
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325 posts in 2552 days

05-16-2013 03:37 AM

We need some new lamps for our home and I am thinking of building a pair like the lamp in the following link:

I am thinking of building these using 1/2 inch ply. From the surface, the design looks pretty simple i.e. one small pyramid stacked on top of a bigger pyramid but somehow my mind is telling me it is not as simple as I think, specially the bevel angles. I can use any help I can get to design and build these.

My main question is: What would be the right bevel angle for all four sides of the pyramid. Is it still 45degrees as in case of a mitered box?

If you were to build it, how would you go about doing it? What jigs or fixtures would come in handy?


2 replies so far

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10476 posts in 3671 days

#1 posted 05-16-2013 03:51 AM

It’s a little bit off 45 degrees but by a very small
amount and you can ignore it in a form with a
mild taper like this one.

I recommend using a lock miter bit to profile the

You’ll need to think about clamping. If the ply is
flat (high quality) you may be able to fold it up and
cinch the miters with tape and overwrap the form
with sliced up bike inner tubes, surgical tubing,
or rope.

Another way to do it, and easy if the appearance
of the joint is acceptable: cut the tapered
parts with 90 edges and cut rabbets on half
of them. If the plywood has a good quality
core the rabbet can be made about 13/32”
deep so there is just a small thickness of plywood
edge exposed on the outside. Clamping
is simplified because the joints can be glued
and nailed easily. Nails can be sunk and filled
or extracted and the holes filled after the glue

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325 posts in 2552 days

#2 posted 05-16-2013 04:56 PM

Thank you Loren for your quick reply.

I have been toying around with another idea in my head… how about regular 45deg bevels supported by a 3/4” x 3/4” backer strip on all 4 inside corners running the length of the pyramid? It will provide more gluing surface. I don’t have enough in my tool reserve to buy a lock miter bit yet. Any thoughts on this approach?

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