Oblique joints join two objects at a beveled edge, usually at a 90-degree angle. Miter joints are common in picture frames and crown moldings, while compound miter joints have different angles. Accurate measurements are necessary for strong joints, and reinforcement methods include adding blocks or splines. Oblique joints can be found in three-dimensional piping arrangements and can be strengthened with lock oblique joints.
An oblique joint is a type of joint in which two objects are joined at a beveled edge, often at an angle of about 90 degrees. The two pieces of material being joined are typically cut at 45 degree angles, so that when joined they form a 90 degree angle. Most oblique joints are perpendicular, but other measurements are used in some circumstances. Miter joints are most commonly used in picture frames or crown moldings and are even used to compact the larger pipes found on a pipe organ.
Sometimes, an oblique joint isn’t perfectly perpendicular. Instead, some special circumstances call for different angles, such as installing trim on a house or creating an oddly shaped frame or box. Regardless of the application, material shear angles must be measured accurately. Accurate and well calculated measurements will allow the two joined pieces to be flush with each other which allows for strong and tight miter joints. The angle at which the pieces should be cut is found by dividing the desired angle of the miter joint in half.
Oblique joints do not consist solely of wood, nor are the materials used always flat. Three-dimensional miter joints can be found in many places, usually in the form of piping arrangements. Pipe bends and bends in a plumbing application typically are formed through pipe joints, but other types of piping employ miter joints. On a pipe organ, the pipes – often known as flues or pipes – can grow to incredible lengths, with some larger organs having pipes up to 64 feet (19.5 m) long. The size of such a pipe is often too large for most churches or concert halls, so an oblique joint may be employed to reduce the size of the pipe.
Another type of oblique joint is known as a compound oblique joint. A completed border made with a miter joint is often perfectly square or rectangular, as in a picture frame. Compound miter joints are different, because they have a different number of sides and angles than you would find on a box or frame. For this reason the corners to be cut must be calculated specifically according to the number of sides used.
Adding strength to oblique joints is very important, because they are typically relatively weak without reinforcement. To help brace an oblique joint, a variety of methods can be used. These methods include things like placing a block inside the joint or adding splines and dovetail keys. For oblique joints in wood, the lock oblique joint is known to be relatively strong and successful. This type of joint is made using a milling machine, where the two pieces are joined together by means of cut notches.
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