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The head is then tightened in place via a lock bolt or lock nut which engages with a channel running the full length of the rule, allowing the head to be tightened on at any point along the rule. [4] [2] The standard or square head has three adjacent flat faces, two of them meet square to one another, and the third face is angled away at 45°.
They are commonly made from clear plastic. The most common set squares are 45° squares, (one 90° corner and two 45° corners) and 60/30 triangles (a 90°, a 60° and a 30° corner). Another type of set square is an adjustable square, which features an edge that can be adjusted to any angle from 0° to 90°. [19] [20]
Router bits can be made to match almost any imaginable profile. Custom router bits can be ordered. They are especially beneficial for home restoration projects, where production of the original trim and molding has been discontinued. Sometimes complementary bits come in sets designed to facilitate the joinery used in frame and panel ...
Bit The section of a key which enters a lock, which has the key cuts formed in it and which engages the bolt or tumblers of the lock. The bit is called a blade in the case of a cylinder key. [2] Bitting The bitting of a key is the physical arrangement of the bit of the key that engage with the locking mechanism. The bitting instructs a ...
A bit key with its main parts labelled. Bitting is the depth of key cuts on a cylinder key for a pin tumbler lock, often expressed as a number. Bitting also refers to the combination of key cuts on a bit key for a warded lock or lever tumbler lock. The exact geometry of modern keys is usually described by a code system. [1]
The rotary force is transmitted through wedges that fit into two or three open grooves. The bit is free to move a short distance and the hammer action moves the bit up and down within the chuck. Two sprung balls fit into closed grooves, allowing movement whilst retaining the bit. There are four standard sizes with varying shank diameters: SDS Quick