Working out compound angles

[joiner1970]

I'm thinking of building some down draught extraction for the contractor style table saw. I want to use my ts55 to build the funnel part out of MDF. Is there an easy way to work out the angles I need to cut the four triangles at. Hope this makes sense , so if the base was flat then the four triangles would be 45 degrees with 90 degree edges. Then as you raise the edges up to form a funnel how does the bevel cut change in conjunction with the angle of the triangle.

I know I could mess about with trial and error but would like to do it right . I probably was taught how to do it at college but its been awhile

 

[peter halle]

You might want to check out the Kapex Supplemental Manual:  http://www.festoolusa.com/media/pdf/Kapex-KS120-Supplemental-Manual.pdf    It has an electronic calculator built in that might help you.  [big grin]

Peter

 

[tjbnwi]

I would just punch it into the BuildCalc app on my iPhone, just incase you don't have the app;

http://www.pdxtex.com/canoe/compound.htm

I see Peter beat me to it.

Tom

 

[joiner1970]

Cheers guys , I don't have any apple products and never will but sure I can find an android equivalent.

Just looked at the link and that's perfect cheers

 

[peter halle]

Cheers guys , I don't have any apple products and never will

I once said that about Festool.  Hmmm......  [poke]

Peter

 

[joiner1970]

The kapex is calling my name   won't be long before I end up buying one.

 

[joiner1970]

Cheers guys , I don't have any apple products and never will

I once said that about Festool.  Hmmm......   [poke]

Peter

Just bought a hudl tablet from tescos does everything I need for a fraction of the cost of an iPad and best of all I can do what I want on it, I'm not being told what I can do like apple. Lol

 

[tjbnwi]

Cheers guys , I don't have any apple products and never will  but sure I can find an android equivalent.

Just looked at the link and that's perfect cheers

BuildCalc is available for Android.

Tom

 

[Michael Kellough]

I'm thinking of building some down draught extraction for the contractor style table saw. I want to use my ts55 to build the funnel part out of MDF. Is there an easy way to work out the angles I need to cut the four triangles at. Hope this makes sense , so if the base was flat then the four triangles would be 45 degrees with 90 degree edges. Then as you raise the edges up to form a funnel how does the bevel cut change in conjunction with the angle of the triangle.

I know I could mess about with trial and error but would like to do it right . I probably was taught how to do it at college but its been awhile

There are a bunch of online calculators. This is the top hit for compound miter calculator.