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1.8: Machined Features

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    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.

    Block with a 45 degree but for welding called a bevel.

    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.

    Piece of metal with a raised surface for welding called a boss.

    Chamfer

    A process of cutting away a sharp external corner or edge. Not for welding.

    Block cut at an angle to remove the sharp edge.

    Counterbore

    To enlarge drilled hole to a given diameter and depth. Usually done for recessing a bolt head.

    Block of material showing an example of a counterbore.

    Countersink

    To machine a conical depression in a drilled hole for recessing flathead screws or bolts.

    Part with a countersink hole to accommodate a tapered screw..

    Dovetail

    A slot of any depth and width, which has angled sides.

    Image showing a dovetail cut in a piece of material.

    Quiz

    Directions: Name the machined features shown below.

    graphic quiz for identification of surfaces and holes.

    Fillet

    A small radius filling formed between the inside angle of two surfaces.

    Material showing a fillet.

    Kerf

    The narrow slot formed by removing material while sawing or other machining.

    Material showing a kerf

    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.

    Image showing a keyseat.

    Knurl

    To uniformly roughen with a diamond or straight pattern a cylindrical or flat surface.

    Example of different knurl types.

    Lug

    A piece projecting out from the body of a part. Usually rectangular in cross section with a hole or slot in it.

    Showing a lug welded onto a piece of material for purpose of attachment.

    Neck

    To machine a narrow groove on a cylindrical part or object.

    Shows cuts made on a lathe into a piece of round stock.

    Quiz

    Directions: Name the machined features shown below. Check your answer.

    Visual quiz to identify the surfaces discussed.

    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)

    Shows a pad welded onto a part.

    Round

    A small radius rounded outside corner formed between two surfaces.

    Show the rounding off of a sharp edge.

    Spline

    A gear-like serrated surface on a shaft. Take the place of a key when more torque strength is required.

    A gear shape.

    Spotface

    A round surface on a casting or forging for a bold head. Usually about 1/16” deep.

    A round surface on a casting or forging for a bold head.

    T-Slot

    A slot of any dimensions to resemble a “T”.

    A slot of any dimensions to resemble a “T”.

    Quiz

    Directions: Name that machined features shown below. Check your Answers.

    Quiz identifying the surfaces discussed.

    This page titled 1.8: Machined Features is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Ric Costin (OpenOregon) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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