GEODESIC DOME BEVELED FRAME JIG EXPLAINED

[@gardensandmore1614]

May be four years ago, but looks interesting. Seen a lot of videos on the Geodesic dome concepts and building schemes and keep telling myself I need to give it a go, for the last 20+ years. At least you have actually done one. I confess the concrete domes tickle my fancy a bit more, but a wood project would be easier to manage. I will need to check out your channel and see if you have more to watch.

[@justmeted1969]

@gardensandmore1614 do check out the new domes they're doing with aircrete and foamcrete. This one was a fun build but I wish I'd known more about waterproofing them. I should have put Z flashing and tar on my windows and angle flashing on the base

[@gardensandmore1614]

@@justmeted1969 Been investigating the concrete domes for more than 20 years and keep telling myself I need one if for no other reason than to hide from the next tornado. From what I remember, they add something that actually grows crystals over time that fills in cracks and voids. Sort of a spin on what you can see in very old caves.

[@skipperga]

A certain amount of profanity? Love that! So what your saying is: You started this project speaking one language - and now you’re fluent in 10 languages. Nicely put. I enjoyed the video. Thanks for sharing.

[@brandocommando36]

this is crazy i watched this same video through my own build and am just realizing your in Cape Breton as well!! haha

[@xxrgxxcasco]

What profanities did you find work best? I really am interested in trying your method.

[@Youtuber-wc3gr]

isnt it easier to to just angle the jig than angling and bevelling all the pieces of frames? if you glue and screw them in at an angle in an angled jig less room for error?

[@justmeted1969]

That's a very good question. I got this build method off Paul Robinson's youtube. He's the expert and may be better equipped to reply. As for consistency, all angled boards were ripped the same angle at the same time. Not too relevant to your question perhaps....? Although the consistency kinda leads to accuracy if you get lucky. As for building an angled jig, there may exist shop quality mitre saws for the making thereof, but what I have is a cheapo table saw allegedly accurate to a full degree. Anything finer is me eyeballing with my old eyes.

[@xxrgxxcasco]

You need to angle the OUTSIDE of the triangle, not the inside. The desired effect is that when you join two triangles together, they form part of a sphere. if they were angled on the inside, then you would just get a flat surface instead of a dome.

[@lucianorobazza1242]

My dome will be 16’ dia. too. Can you tell me if the strut lengths and bevel angles I am using are correct? A strut is 2.79. B strut is 3.23, and C strut is 3.30. Struts A and C 166 degrees and strut b is 169 degrees…. Every time I draw these in AutoCAD, the pentagon and hexagon panels do not line up, and I end up with a gap 😢

[@justmeted1969]

I would look at some of Paul Robinson's videos on KZbin here, under the channel of the same name. His really good dome building vids are from a few years ago, so dig a bit. I myself haven't used Autocad since college 10 years ago, and that for electronics applications. Paul seems to have good success with sketchup. I designed my triangles on paper old school...a holdover from my mechanical engineering attempt at university 30 some years ago, when they still had a giant sliderule on the wall, haha. According to domerama.com , another site I used during my build, your numbers are spot on. Paul really explains the beveled frame build well in his videos. kzbin.info/www/bejne/gIPFhax8gJegbdU

[@justmeted1969]

Domerama.com doesn't give the angles but Paul's site does, tho his calculator page isn't obvious to find. geo-dome.co.uk/3v_tool.asp

[@philhewett1601]

How did you determine the 7 degree angle?

[@JohnGuest45]

For a 3v, the pentagon triangle edge bevel is 7.22 deg (short sides) and 4.13 deg (long side). Hexagon triangle edge bevel is 7.23 deg (short side) and 6.79 deg (long sides).

[@xxrgxxcasco]

the angle is 166°, so you compensate with 14° (this is the dyhedral angle). Now, those 14 degrees are on two wooden pieces, each is offset by 7 degrees, so you get the 14° needed to compensate the 166° of the curvature.