Join Date: Jan 2018
Location: Lancashire, England
I worked it out the old fashioned way. I made a test piece out of foam core board by cutting 4 equilateral triangles, tacking the edges together with superglue then using a set square from the centre of the bottom edge to the peak I marked my bevels. Took it apart and carefully cut the bevels with a stanley knife and with a quick touch up with sandpaper to my great relief it all came together with only a couple of gaps were my knife wobbled off line. Then I realised I had glued it together and hadnt measured the bevel DOHH!!!!!. Managed to break it apart without too much damage and then realised I couldnt find my protractor but my workbench has a 30 and 45 degrees drawn on it and it looks to be slightly less than halfway between 30 and 45 degrees so I am guessing 36 degrees give or take a couple of degrees.
I know some people measure angles differently so its +36 degrees from the horizontal. I looked at my mitre saw to see if I could do the cuts but it only goes as far as 45 degrees and looked like it would be very awkward and dangerous to do the cuts even if it was possible.
All the different angles people have given might just be the same angle measured in different ways I couldnt work it out till I had made the cuts myself.
Measure twice, Cut once, Then force it to fit with a big hammer.
Last edited by AltcarBob; 03-08-2018 at 08:22 AM.