Mitre clamp Mitre clamp Mitre clamps are designed to hold mitre joints together. The earliest mitre clamps are a simple spring in a C-shape with sharpened points that are sprung onto the outside corner of the mitre joint. The right angled plates are higher than the screws and the red holder. The screws go under the frame (work-piece) to be held, and the red bit clamps down on the lower-edge of the frame. Recent designs are more complicated; a rigid body holds one fixed and one moveable jaw activated by a cam. Examples of the newer clamps are Jim Chestnut's "Clam Clamp"
Mitre box case to be made for making one today; for example, if an odd size (say, 175mm) cornice is to be fixed, then a custom mitre box with a bottom board that is 175mm wide would ensure that the cornice sits true while the cuts are being made to it. The three pieces of timber that form the mitre box are nailed together, and the top steadying pieces are fixed with smaller panel pins. The angles are marked (at any angle, not necessarily 45 degrees) and the guide slots are cut with the same saw that will be used for the