nbbttt diy chat: carpentry maths is wild af

e.g. joining dado rail mitre joints at external corners, wtaf?

ok, use a digital angle finder to get a reading of 136.7

round it up to 137 and divide that by 2 and that will work right? nah will it f**k but well done you've just wasted 12 quid of dado rail you chump.

what you need to do apparently is start off with 180 degrees minus your angle of 137 which equals 43, divide that by two which gives 21.5 degrees and that is your mitre saw cut angle.

worked like an absolute charm. took me two trips to b&q and one to screwfix and most of the day but got there in the end. gracias you tubes.

Posted By: Tombs, Oct 15, 20:54:15