Vocabulary Terms (6/4) -- VESL Basic Blueprint Reading

Vocabulary Terms - BEVEL - BOSS - CHAMFER - COUNTERBORE - COUNTERSINK - DOVETAIL - FILLET - KERF - KEYWAY - KEYSEAT - KNURL - LUG - NECK - PAD - ROUND - SPLINE - SPOTFACE - T-SLOT The machined features in this section are common terms related to basic industry processes. These terms are often found on prints. For a better understanding of these processes, look at the models of machined features in the Print Reading Lab. Bevel A surface cut at an angle. In regard to welding, a bevel will normally end up being a surface prep for a weld. Boss A circular pad on forgings or castings, which project out from that body of the part. The surface of the boss is machined smooth for a bold head to seat on and it has a hole drilled through to accommodate the bolt shank. Chamfer A process of cutting away a sharp external corner or edge. Not for welding. Counterbore To enlarge drilled hole to a given diameter and depth. Usually done for recessing a bolt head. Countersink To machine a conical depression in a drilled hole for recessing flathead screws or bolts. Dovetail A slot of any depth and width, which has angled sides. Practice Fillet A small radius filling formed between the inside angle of two surfaces. Kerf The narrow slot formed by removing material while sawing or other machining. Keyway A narrow groove or slot cut in the shaft hole of a sleeve or hub for accommodating a key. Keyseat A narrow groove or slot cut in a shaft for accommodating a key. Knurl To uniformly roughen with a diamond or straight pattern a cylindrical or flat surface. Lug A piece projecting out from the body of a part. Usually rectangular in cross section with a hole or slot in it. Neck To machine a narrow groove on a cylindrical part or object. Practice Additional features and shapes. Pad A slightly raised surface projecting out from the body of a part. The pad surface can be of any size or shape. (Remember, bosses can only be round) Round A small radius rounded outside corner formed between two surfaces. Spline A gear-like serrated surface on a shaft. Take the place of a key when more torque strength is required. Spotface A round surface on a casting or forging for a bold head. Usually about 1/16” deep. T-Slot A slot of any dimensions to resemble a “T”. Practice Directions: Name that machined features shown below.