Does anyone know a sure fire method to figuring out what the bevel cuts would be on
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I'm just curious, but why do you bevel your sleepers? I don't bevel them, only wide hips and true valleys so I don't recall the method off the top of my head.
I remember Tim Uhler and someone else discussing this a while back.... hopefully he'll drop in soon. I'm pretty sure he can rattle it off for you.
I bevel the sleepers because my boss prefers it that way. he also likes the plywood to be beveled. I wouldnt if I didnt have to, believe that.
You take the two backing bevels for each pitch and add them together and suntract them from 90°. For a 8/12 and 10/12 combination. The 8/12 bevel is 20.27° and ther 10/12 bevel is 29.99°.
90° - (20.27° + 29.99° = 50.26°) 90° - 50.26° = 39.74° (Bevel)
With a regular roof same pitch double the backing bevel subtracting the result from 90°. That's your angle you set on the saw. For an 8/12 pitch roof the bevel is 23.09°.
90° - (23.09 x 2 = 46.18°) 90° - 46.18° = 43.82° (bevel)
What are your two pitches?
Joe Carola
Edited 12/7/2005 10:35 pm ET by Framer
Ive got a 7 coming into a 5 being covered with t and g soffit material exposed from the underside before the sheeting goes on.
Do you have the roof framers bible? If you are dealing with whole number pitchs (5,6,7 etc) then just get the bevels from there and follow Joe's math. It works really well and the method is the same regardless of the roof it's on. You can set your saw to the bevel and it doesn't matter if the sleeper is on the 5 or the 7 pitch.
5-12 bevel 12.84
7-12 bevel 24.21
24.21+12.84=37.05
90-37.05=52.95°
Edited 12/7/2005 10:45 pm ET by Timuhler
Ive been meaning to hunt down a copy of that book for a cuople of years now and havent gotten hold of one. Maybe Santa will drop one off for me.
5-12 bevel 12.847-12 bevel 24.2124.21+12.84=37.0590-37.05=52.95°Tim,Not that it makes a difference but I have:5/12 bevel - (12.92°)7/12 bevel - (24.20°)12.92° + 24.20° = 37.12°90° - 37.12° = 52.88°I have 18.73° for the Hip/val pitch. Do you have the same?I have 35.54° and 54.46° for the plan view angles.Joe Carola
I dont think my saw can discearn .07 of a degree
5-12 bevel 12.84
7-12 bevel 24.21
24.21+12.84=37.05
90-37.05=52.95°
Tim,
Not that it makes a difference but I have:
5/12 bevel - (12.92°)
7/12 bevel - (24.20°)
12.92° + 24.20° = 37.12°
90° - 37.12° = 52.88°
I have 18.73° for the Hip/val pitch. Do you have the same?
I have 35.54° and 54.46° for the plan view angles.
Joe Carola
Joe,
I have 18.73°for the hip pitch
5-12 bevel I have 12.92°
7-12 24.21°
I must have done something wrong last night. I know that I rounded the (5/7) to .71 when I did the math so that must be the difference. I got the same plan view angles, but when I did the math I didn't convert to degrees, I just left the tan as a decimal when I was writing down the numbers.
I did 5/7 = rounded .71 Instead of tan(5/7)
I cheat with a Hip/Valley Sections Calculator.
Enter the pitches and angle in plan between the Hip eaves or Valley ridge lines and read the Sleeper Saw Bevel Angle (52.87630° for the given 5/12 and 7/12 pitches).Joe Bartok
Thanks Joe that makes perfect sense.
Thanks Joe.... that's a much simpler formula than I thought it was. Now it's not so scary. ;)
Brian,Tim's the one that started this whole thing a couple years ago back in the day with Ken Drake coming up with it. It's something that I've never done or seen anyone do until his thread about it out of curiosity and it works perfect. But some guys like to do it or have to do it and that's great and it works.Joe Carola
G-day mate :-) Nice formula. I smile everytime the mention of beveling a sleeper comes up thinking about tims past LOL
The formula just popped into my head while I was watching Martha Stewart's, Apprentice......;-)Joe Carola
where and what do you guys build out of curiosity?