Hey guys, I'm struggling to find information on how to create

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Anonymous
2016-07-27 13:05:49 Post No. 1028877
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Anonymous 2016-07-27 13:05:49 Post No. 1028877 [Report]

Hey guys, I'm struggling to find information on how to create a shape like this.

I'm an apprentice sheetmetal worker and I'm currently trying to make a smoke extractor for my forge. I've asked my tafe lecturers and the other guys at my work but they either don't know or don't care so I'm asking here.

I want to basically make a 45 degree angle range hood that looks roughly like the picture. It would consist of 4 sides and a top with no bottom to create a range hood style thing that I can attach onto my bastardised fume extractor to hang above my forge.

I have no idea what you would even call this so I haven't been able to find any information. I'd like to learn how to work this out manually on paper so any information or formulas would be great. (No calculators please.)

Any help is greatly appreciated, Thanks.

Anonymous 2016-07-27 13:09:01 Post No.1028879
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Anonymous 2016-07-27 13:09:01 Post No.1028879 [Report]

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34KB, 468x800px

Heres my forge if any ones interested.

Anonymous 2016-07-27 13:16:35 Post No.1028882
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Anonymous 2016-07-27 13:16:35 Post No.1028882 [Report]

Sorry.. I completely missed out the specific question. I have tried this before just cutting at 45 but it didn't fit up (obviously). I'm looking for a way to calculate the specific angle needed to have the sides join up if say I know I want the perimeter of the bottom to be 600mm x 800mm.

I want to make the sides 45 degrees so I would just

Anonymous 2016-07-27 13:39:40 Post No.1028888
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Anonymous 2016-07-27 13:39:40 Post No.1028888 [Report]

/po/ should be able to help you. They work with paper, not metal, but the principle is the same.

Anonymous 2016-07-27 13:42:17 Post No.1028889
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Anonymous 2016-07-27 13:42:17 Post No.1028889 [Report]

>>1028888
Ah, Good idea.
I'll ask there then. Thanks!

Anonymous 2016-07-27 13:50:50 Post No.1028892
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Anonymous 2016-07-27 13:50:50 Post No.1028892 [Report]

>>1028877
Maths incoming.

http://benkrasnow.blogspot.com/2008/09/determining-proper-angles-to-cut.html

http://jansson.us/jcompound.html

Alternately, spend an hour learning how to use any of the free CAD programs, like Sketchup. You can then break apart each face into a 2D object and get measures and angles off your model.

Alternately alternately, scale cardboard mockup. Brute force it till it is right. Pattern off of it.

Anonymous 2016-07-27 13:56:14 Post No.1028894
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Anonymous 2016-07-27 13:56:14 Post No.1028894 [Report]

>>1028892
Compound angles!
Awesome! I have been meaning to learn a design software sometime so I may do that. But I like manually doing things on paper at the moment.

Thanks heaps man.

Anonymous 2016-07-27 14:54:30 Post No.1028915
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Anonymous 2016-07-27 14:54:30 Post No.1028915 [Report]

>>1028877
1 piece or 2 piece and what are rough dimensions or at least what are you looking for

TacoWoe 2016-07-27 20:35:45 Post No.1029033
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TacoWoe 2016-07-27 20:35:45 Post No.1029033 [Report]

I did it on paper, let's say you have a maltese cross of some kind, what is the angle between the leaves? 19.5 degrees.

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I'm aware that Imgur.com will stop allowing adult images since 15th of May. I'm taking actions to backup as much data as possible.
Read more on this topic here - https://archived.moe/talk/thread/1694/