Machining

Machining at a metal fabrication shop refers to a set of processes used to shape, cut, or finish metal parts with precision. It involves removing material from a metal workpiece to get the desired shape, size, and surface finish, usually using specialized equipment.

Here are some common machining processes you might find in a metal fab shop:

Common Machining Processes:

Milling – A rotating cutting tool removes material from the workpiece. It’s great for creating flat surfaces, slots, holes, and complex shapes.
Turning (Lathe Work) – The workpiece rotates while a cutting tool removes material. Typically used for cylindrical parts.
Drilling – Creating round holes using a rotating drill bit.
Grinding – Uses an abrasive wheel to achieve high precision and surface finish.
Tapping & Threading – Creating threads inside holes (tapping) or on the outside of a rod (threading).
CNC Machining – Computer-controlled machining that offers high accuracy and repeatability.

In the Context of a Metal Fab Shop:

Machining is often part of the final or finishing stages after cutting, bending, or welding.
It’s used when tight tolerances or specific features are needed (like threaded holes or smooth surfaces).
CNC machines are often used for complex or high-volume jobs.

Want a visual or a real-world example of how it’s used?

Great question—machining and metal fabrication are closely related, but they’re not the same thing. Here’s a quick breakdown:

Metal Fabrication – The Big Picture

Definition: Metal fabrication is the overall process of building metal structures by cutting, bending, welding, and assembling parts.

Includes Processes Like:

Cutting – Using lasers, plasma, waterjets, or shears to cut metal sheets or tubes
Bending/Forming – Using press brakes or rollers to shape metal
Welding – Joining metal parts together
Assembling – Putting everything together into a finished product

Examples:

Building a metal staircase, a frame for machinery, or a custom bracket
Sheet metal work for HVAC systems
Structural steel fabrication for buildings

Machining – Precision Work

Definition: Machining is a subset of fabrication focused on removing material to achieve a precise shape, fit, or finish. Usually done after the initial fabrication steps.

Involves:

Milling
Turning (Lathe Work)
Drilling
Grinding
CNC Machining

Purpose:

To get tight tolerances
Add fine details like threads, holes, or slots
Improve surface finish

Examples:

Making a gear or axle to exact specs
Drilling mounting holes in a custom bracket
Threading a part so it can be bolted to something else

+ Working Together

Most metal fabrication shops offer both services:

First, they cut and weld the basic structure (fabrication)
Then, they machine critical features that need high precision

Want to dive into a specific industry or product where both are used?