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Math
Dec 19, 2015 22:31:07 GMT -5
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Post by GhostFist on Dec 19, 2015 22:31:07 GMT -5
Are you math people or do you prefer a construction calculator to do your functions for you? Geometry much?
I've been trying to brush up on trig and am kinda surprised at how much resistance people have towards understanding it. I've had carpenters get upset at me for talking about it. For layout simple plane geometry is a must and a knowledge of trig helps to ensure everything is kosher. Thoughts?
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Post by holmz on Dec 20, 2015 1:11:44 GMT -5
Let me know if you need any help. It never hurts to use math(s), and it is a lot easier when it is applied (IMO). I was cutting some wood the other day for the curved bridge. There was a 2-mm gap on the outside of the 20-mm thick boards. I figured 1/20 of a radian is ~3 degrees, and sure as $hit it fit perfect.  |
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Post by wrightwoodwork on Dec 20, 2015 5:25:44 GMT -5
Ive had a look at the construction calculators and to me they seem more geared towards the imperial system. I personally use maths. Some formulas I use is 3sq + 4sq = 5sq or 1200+1600=2000 for checking square quickly. I use soh cah toa for working out my angles and Trig I sometimes like to drawer a diagram so I know I'm using the right one
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Math
Dec 20, 2015 5:56:28 GMT -5
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Post by GhostFist on Dec 20, 2015 5:56:28 GMT -5
Yes Pythagoras is key! Like you I do straight geometry and check with trig. Personally I rarely do roofing but am interested in the math involved. I am confident I can work out common, hip and valley rafters but not doing it all the time I'll admit to being an eighth speed of a seasoned vet. Some of you guys might even yell at me on site. I'm sure Red has some tricks.
Anyway it's always good to review this stuff, even basics just to keep on me toes
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Post by wrightwoodwork on Dec 20, 2015 8:26:25 GMT -5
We work in degrees pitch ,where I think in America work in 12 then say rise 6 or 8 etc. In the UK most roofs are trusses which have a label on saying the pitch which actually gives you you're angel of the plum cut using your kss type saws then from that you can quickly work out your seat cut which is 90-plum cut = seat cut. Example 40 degree pitch set the saw to 40 for any plum cuts , then 50 for any seat cuts
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Math
Dec 20, 2015 8:33:51 GMT -5
Post by GhostFist on Dec 20, 2015 8:33:51 GMT -5
Ya it's always the rise/run pitch ratio I suppose for convenience of setting off a framing square. Which brings me off topic a little I've noticed several differnet types of framing squares used in Europe from videos and what have you. What do you use Aaron?
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Math
Dec 20, 2015 9:38:39 GMT -5
via mobile
Post by wrightwoodwork on Dec 20, 2015 9:38:39 GMT -5
When I first started I used to use a couple of bevels one for the seat and one for the plum cut. Works fine until you realise it's being knocked off. I can for a lot of it get away with just the kss rail. I also do have an alpha square which I use for marking out and setting the angels on the hips etc I should really make a video showing how I use it. There is also the Steve chapels roofing square that does look really good
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Math
Dec 20, 2015 9:54:57 GMT -5
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Post by charley1968 on Dec 20, 2015 9:54:57 GMT -5
Yes, i use math and i use a calculator. But what is a construction calculator? That said, i'm no pro and don't have to figure out angles that have to stand up to proffessional scrutiny, like the pitch of a roof or something. Sometimes i have to check what function to employ.
But i think ole' Pythagoras goes a long way..
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Math
Dec 20, 2015 10:04:50 GMT -5
Post by Deleted on Dec 20, 2015 10:04:50 GMT -5
For on site math have used the construction master for ease of fractional measurements . Have always liked the visual of roof triangles drawn out to size ,how they relate to one another . The best source roof triangles that i have ever found for drawing out the 10 triangle for a common roof . |
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Post by mick on Dec 20, 2015 16:35:05 GMT -5
Done it by maths for years then got lazy construction calculator now
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Math
Dec 21, 2015 16:21:22 GMT -5
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GhostFist likes this
Post by holmz on Dec 21, 2015 16:21:22 GMT -5
Seems like a fraction of us use it.
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Math
Dec 21, 2015 17:36:28 GMT -5
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Post by charley1968 on Dec 21, 2015 17:36:28 GMT -5
Well, it has a function
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Math
Dec 21, 2015 19:08:41 GMT -5
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Post by GhostFist on Dec 21, 2015 19:08:41 GMT -5
I get it
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Post by Red on Dec 22, 2015 9:08:32 GMT -5
I just saw this thread for the first time and thought I'd weigh in...You don't necessarily need a "construction calculator" to deal with fractions. A good scientific calculator can deal with your trig issues and fractions...and, yes, they have a "function." 
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Math
Dec 22, 2015 15:31:35 GMT -5
via mobile
Post by GhostFist on Dec 22, 2015 15:31:35 GMT -5
Ha ya I use both. Fractions to decimal and back is a simple conversion. I alway fear relying too much on the construction calculator keeps you from understanding what is actually going on and therefore you won't know if something is wrong. Here's something I'm just trying to see better. Trying to better understand cutting crown on the flat I can work out the miter angle simple enough but trying to picture the triangle involved in the bevel angle.
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