9 Machined Features

Machined Features

  • 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.

 

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.

 

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Basic Blueprint Reading by Linn-Benton Community College is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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