Hi Ctacker!
Please correct me if I misunderstood the premise of your question because, I'm going to quote you verbatim from the summation of your question...
"what exactly are the ranges of prequalified joint BC-P6, (as fit up?)
D1.1 shows 45 deg."
1.) "as detailed +10 -0"
2.) "as fit up +10 -5"
"so if you have +10 as detailed, and +10 -5 as fit up, wouldnt that give the range of 40 - 65 deg?"
If you are only concerned with the as fit up tolerance range, then the minimum would be 40 and the maximum would be 55 degrees.
However, if the detailer has already given a +10 from the original 45 degrees, one then has up to 10 degrees more to include to the original unit of measurement of 45 degrees before one implements an "As fit up" tolerance which would be: -5 to +10... the result would be 45 +10 then an additional +10 degrees from the "as fit up" tolerance range allowance.
Remember that one also has a minimum tolerance range allowance of -5 degrees which would be subtracted from the original 45 degrees, resulting in an overall tolerance range allowance for "as fit up" to be 40 to 65 degrees, and the "as detailed" tolerance of only being: 45 to 55 degrees
So practically speaking, one could end up with a "As fit up" tolerance range for a 45 degree angle of: 40 to 65 degrees so long as the "as detailed" +10 is included with the +10 from the "As fit up " tolerance as well as the -5 from the "As fit up " tolerance is to refer to the original 45 degrees, which would therefore allow for a minimum tolerance of 40 degrees... So it all depends on what the detailer's range of tolerance may allow before one calculate's the "as fit up" range of tolerance for a specific measurement as in this case would be in degrees.
I guess we're lucky that we're not being asked to be too precise whereby minutes and seconds are also being included as units of measurement also ;)
Respectfully,
Henry