Introduction

OD Turning, short for Outside Diameter (or Outside Dimension) Turning, is a machining process used to create cylindrical parts by removing material from the outer diameter of a workpiece.

OD Turning can either be done along the length of the workpiece, up to the chuck, without controlling the length of the feature —OR— to a specific length, where the feature ends at a Shoulder some distance from the end face of the workpiece or in relation to some other feature.

This lesson covers both, beginning by turning the OD of the workpiece to the largest diameter called for on the print up to the chuck. Then, a second diameter is turned to a specific length.

Challenge

Strategy

Learning Goals

Understand

Perform

Demonstration

First Feature: from Ø2″ stock to Ø1.75″ ±.005″

Planning Passes

We can't just start cutting and hope for the best. We need a plan that will allow us to arrive at the desired dimension and surface finish. With practice this will become reflexive, automatic, but in the beginning you must approach making each part feature with a clear plan.

The strategy is to work backwards, step-by-step, from the feature we're trying to make, back to the starting point.

ROUGHING

TEST CUTS & FINISHING

Second Feature: from Ø1.750″ to Ø1.000″ ±.005″ x 1.000″ ±.005″ long

Planning Passes

Next we plan passes for the second feature.