what angle to cut at

[farmerste]

just about to order some steel to put another bay on the end of an existing portal frame shed, it has a 15 degree roof pitch so am i guessing rightly that i need to ask steel stockholders to make my cuts at 115 degrees ,cant remember properly what angles i asked for the last time i had some cut and its a long time since i was at school

 

[shumungus]

105 degrees for 15 degree pitch.
90 degrees +/- 15 degrees

 

[JD6920s]

105 degrees for 15 degree pitch.
90 degrees +/- 15 degrees

just about to order some steel to put another bay on the end of an existing portal frame shed, it has a 15 degree roof pitch so am i guessing rightly that i need to ask steel stockholders to make my cuts at 115 degrees ,cant remember properly what angles i asked for the last time i had some cut and its a long time since i was at school

I thought 75 deg!

 

[KennyO]

I thought 75 deg!

Surely depends which angle you measure. One side will be less than 90deg one more?

 

[puppet]

As long as they total 180

 

[shumungus]

I thought 75 deg!

As I said 90 +/- 15 soooooo
105 or 75 depending on which one you measure obtuse or acute.

 

[designanddetail]

Just sketch something like this out and note the 15deg splay cut, they measure the angle from the square cut.

 

[farmerste]

thanks guys , thought i was right but then started doubting myself

 

[Forever Fendt]

Saws generally work as zero is sq cut so order 15 deg