A 45 degree cut.
No, elbow 135 degree and elbow 45 degree are different from each other.
You dont.External corners are mitred,while internal corners are scribed.
this app help you: "Miter Flat Pattern Design" in play.google.com
We'll generally use a "miter box" to hold the stock to be cut in a fixed position, and then hold the saw at a fixed angle to the stock. Most miter boxes will allow 90 degree, 60 degree, 45 degree or 30 degree cuts. Some specialized ones allow you to cut at any arbitrary angle to the stock.
You set the bevel on your saw to a 45 degree angle. Then set the angle on your saw base to the angle of your plumb cut.
You find the center of a screwed 45 degree elbow by bisecting the angle.
How to calculate 90 degree and 40 degree elbow center >For 90 degree elbow(Dia*38.1) this formula used for only 90 degree elbow. >For 45 degree elbow(45/2of tan*Dia*1.5*25.4) this answer obtained in (mm).
If you are doing a 90 degree corner, the miter angles with each be 45 degrees at the cut. If you are doing a corner that is not square - you are going to need a protractor or another device to measure the angle. Square corner or not, the sum of the miter angles will equal the total angle of the corner.
cut a 22 1/2 out of it
You need a miter saw. It has a back gauge to butt the wood up to, and then the saw has holders to keep it from wobbling. You can set the angle. It may just have notches for 90 degrees and 45, or it may have a protractor on it.
Formula for calculating center to end distance of such elbows is as follows: For 90° Long Radius elbows, center to end dimension given in dimension tables of ASME B16.9 is same as radius of elbow. This is because Tan (90/2) i.e. Tan 45 is 1. Normally custom elbow angles from 45 degree to 90 are cut from 90 degree standard elbow. If that's what you were asking about...