3: Machined Features
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- Liisa Pine
- Chabot College
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.
Quiz
Directions: Name the machined features shown below.
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.
Quiz
Directions: Name the machined features shown below. Check your answer.
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”.
Quiz
Directions: Name that machined features shown below. Check your Answers.