Pat Meeuwissen Posted October 13, 2019 Report Share Posted October 13, 2019 Guys, I use a website called Blocklayer to get allot of my calculators, used it this time to make a twelve sided roof and I must have interpreted something incorrectly. My settings on the tablesaw were 78.4 on the miter and 23.2 on the bevel which I took to mean from 90 that was 66.8. This did not give me the results I wanted at all instead of a roof from 12 pieces which when joined should produce a lift of 3 23/32" and a spread of 9.? not sure exactly what it was. I was able to get 7 sections to glue together well but produced a roof that was only 5 1/2" across and 6" high. I'm attaching the printout from the website where did I go wrong???? Gunny and FlGatorwood 1 1 Quote Link to comment Share on other sites More sharing options...
John Morris Posted October 13, 2019 Report Share Posted October 13, 2019 Hey Pat, link us to that calculator if you would. Thanks! Cal and FlGatorwood 1 1 Quote Link to comment Share on other sites More sharing options...
Pat Meeuwissen Posted October 13, 2019 Author Report Share Posted October 13, 2019 https://www.blocklayer.com/pyramid-calculatoreng.aspx Gunny, Cal, DuckSoup and 1 other 4 Quote Link to comment Share on other sites More sharing options...
lew Posted October 13, 2019 Report Share Posted October 13, 2019 I think the mistake is in the angle of the blade. The 23.2° is the total angle at the point of the piece. I think the table saw blade angle should have been 20°. The phi angle is defined as the internal angle. My thinking is that you set the internal angle to be 40° so the blade should be set to 20°. I failed algebra in school so take what I'm saying with a very large grain of salt. FlGatorwood, Gunny and Cal 1 2 Quote Link to comment Share on other sites More sharing options...
Pat Meeuwissen Posted October 13, 2019 Author Report Share Posted October 13, 2019 Lew, with the way I cut them the angle would need to be drastically less than the 23.2 because the gap was way too open when I had all twelve sections in place. FlGatorwood and Cal 2 Quote Link to comment Share on other sites More sharing options...
lew Posted October 13, 2019 Report Share Posted October 13, 2019 (edited) According to Sketchup, the angle is 75° (15°) Edited October 13, 2019 by lew FlGatorwood, Cal and DuckSoup 3 Quote Link to comment Share on other sites More sharing options...
John Morris Posted October 13, 2019 Report Share Posted October 13, 2019 Whenever you make a circle and are using degrees to complete that circle, the degrees have to add up to 360. Lew is correct, it's 15 degrees, as 15 degrees x 24 sides, is 360 degrees. Cal, FlGatorwood and Gunny 3 Quote Link to comment Share on other sites More sharing options...
Gene Howe Posted October 14, 2019 Report Share Posted October 14, 2019 I'm dumb. What's the angle for the bottom and sides of each triangle? Cal and FlGatorwood 1 1 Quote Link to comment Share on other sites More sharing options...
Ron Dudelston Posted October 14, 2019 Report Share Posted October 14, 2019 Won’t the narrow sides also have to be angled for a tight fit? FlGatorwood and Cal 2 Quote Link to comment Share on other sites More sharing options...
John Morris Posted October 14, 2019 Report Share Posted October 14, 2019 The sides of each roof piece have to be cut at 15 degrees. FlGatorwood, Artie and Ron Dudelston 3 Quote Link to comment Share on other sites More sharing options...
Cal Posted October 14, 2019 Report Share Posted October 14, 2019 15 would be the miter cut, what is the bevel cut? Is 23.2 correct? FlGatorwood 1 Quote Link to comment Share on other sites More sharing options...
Gene Howe Posted October 14, 2019 Report Share Posted October 14, 2019 1 hour ago, Cal said: 15 would be the miter cut, what is the bevel cut? Is 23.2 correct? Yeah, Cal. My question was a bit confusing. The bevel cut I meant. Thanks. Would it be the same for the bottoms, too? FlGatorwood and Cal 2 Quote Link to comment Share on other sites More sharing options...
lew Posted October 14, 2019 Report Share Posted October 14, 2019 1 hour ago, Gene Howe said: Yeah, Cal. My question was a bit confusing. The bevel cut I meant. Thanks. Would it be the same for the bottoms, too? Bottom angle DuckSoup, Cal and FlGatorwood 3 Quote Link to comment Share on other sites More sharing options...
lew Posted October 14, 2019 Report Share Posted October 14, 2019 FlGatorwood, DuckSoup and Cal 3 Quote Link to comment Share on other sites More sharing options...
Popular Post steven newman Posted October 14, 2019 Popular Post Report Share Posted October 14, 2019 On my mitre boxes...there IS a setting labelled "12"....as in the angle needed for a 12 sided box... Cal, FlGatorwood, Gunny and 2 others 5 Quote Link to comment Share on other sites More sharing options...
Gene Howe Posted October 14, 2019 Report Share Posted October 14, 2019 Muchas gracias, Lew. lew, Cal and FlGatorwood 3 Quote Link to comment Share on other sites More sharing options...
DuckSoup Posted October 15, 2019 Report Share Posted October 15, 2019 Ok @Pat Meeuwissen, because inquiring mines want to know, Wha'cha building? FlGatorwood 1 Quote Link to comment Share on other sites More sharing options...
Pat Meeuwissen Posted October 15, 2019 Author Report Share Posted October 15, 2019 7 hours ago, DuckSoup said: Ok @Pat Meeuwissen, because inquiring mines want to know, Wha'cha building? Just a silly birdhouse, an exercise in how to do things. Already have the twelve sided body glued up and planned clean. DuckSoup, Gunny, John Morris and 1 other 4 Quote Link to comment Share on other sites More sharing options...
John Morris Posted October 15, 2019 Report Share Posted October 15, 2019 10 minutes ago, Pat Meeuwissen said: Just a silly birdhouse, an exercise in how to do things. Already have the twelve sided body glued up and planned clean. How'd the roof cuts go Pat? As planned? FlGatorwood 1 Quote Link to comment Share on other sites More sharing options...
Pat Meeuwissen Posted October 15, 2019 Author Report Share Posted October 15, 2019 Lew and I are doing a redesign behind the curtain. As soon as we work it out I'll post the results. Gunny and FlGatorwood 2 Quote Link to comment Share on other sites More sharing options...
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