Used Mills for Sale

Used Milling Machines in Stock

A milling machine removes material using a rotating cutter to create flat surfaces, slots, pockets, keyways, and precision features.
Mills are foundational shop machines for toolrooms, maintenance departments, and production environments because they are versatile and capable of
repeatable results. This page covers the basics of milling machines, explains why many shops still prefer classic manual mills for specific work,
and answers common questions people search when comparing horizontal mills and vertical mills.


Horizontal milling machines

A horizontal milling machine uses a spindle that is oriented horizontally, typically running an arbor-supported cutter.
Horizontal mills are especially strong for cutting slots, keyways, straddle milling, slab milling, and heavier cuts that benefit from rigid support.
Many shops like horizontals because arbor support can improve rigidity, chip evacuation is often excellent, and cutters can remove material efficiently.

Vertical milling machines

A vertical mill has a vertically oriented spindle and is commonly used for general-purpose milling, drilling, boring,
and fixture work. Vertical mills are popular because setup is often intuitive, the work area is easy to see, and tooling options are broad.
Many shops use vertical mills for one-off work, prototypes, maintenance tasks, and short-run production.

Featured example: Kearney & Trecker horizontal mill

You may see machines like a 38" x 14" Kearney & Trecker Horizontal Milling Machine (example:
Model 18-AC). Kearney & Trecker mills are well-regarded for robust construction and rigidity, making them a common choice
for heavier manual milling work. The “38 x 14” size is often used as a quick reference to table capacity, but real-world capability depends on
table travel, spindle configuration, and tooling setup.

What milling machines are used for

  • Machining flat surfaces and precision faces
  • Cutting slots, keyways, and grooves
  • Creating pockets and steps
  • Fixture and tooling work
  • Maintenance machining and repair fabrication

Tooling basics

Milling capability is heavily influenced by tooling. Common tooling and setups include:

  • Arbors (horizontal mills): Support cutters for rigid setups and efficient material removal.
  • End mills (vertical and horizontal): Versatile cutters for slots, pockets, and profiles.
  • Face mills: Used to create flat surfaces and clean finishes efficiently.
  • Vices and fixtures: Workholding is often the biggest driver of accuracy and repeatability.

Milling machine FAQs

What is the difference between a horizontal and vertical mill?

A vertical mill has a vertical spindle and is commonly used for general machining and flexible setups. A horizontal mill has a horizontal spindle,
often with arbor support, and excels at heavier cuts, slotting, and certain production-style milling operations.

Why do some shops prefer horizontal mills?

Horizontal mills can be very rigid due to arbor support, can remove material efficiently, and often handle certain cutters and setups better than verticals.
They are especially good for slab milling, straddle milling, and cutting keyways or slots with strong support.

What does “38" x 14"” mean on a milling machine?

It typically refers to the approximate table size, which gives a quick sense of the work envelope. Actual usable travel and capacity depends on the machine’s
X/Y/Z travels, spindle-to-table distance, and how the part is fixtured.

Can a horizontal mill do what a vertical mill does?

There is overlap, but each style has strengths. A horizontal mill can perform many operations, especially with the right attachments and tooling,
but vertical mills are often simpler for certain drilling/boring style setups and visibility. Many shops use both depending on the work.

What is an arbor on a horizontal mill?

An arbor is a shaft that holds cutters and is supported by an overarm. This support improves rigidity and helps the machine handle heavier cuts
and wider cutters with better stability.

What is the most common reason milling results look “inaccurate”?

Most issues come from workholding and setup, not the machine itself. Loose clamping, poor fixturing, dull tooling, incorrect speeds/feeds,
and part movement under cutting load can all cause chatter, poor finish, and dimensional variation.

How do I choose speeds and feeds?

Speeds and feeds depend on material, cutter type, cutter diameter, and desired finish. Too fast can overheat tooling and reduce life.
Too slow can cause rubbing and poor finish. Most machinists start with tooling manufacturer recommendations and adjust based on cut behavior.

What are common milling machine maintenance points?

  • Ways and lubrication
  • Backlash in lead screws
  • Spindle condition and noise
  • Table movement smoothness
  • Workholding cleanliness and alignment

What info helps match a mill to a shop’s needs?

  • Typical part size and material
  • Operations required (slotting, facing, keyways, etc.)
  • Workholding and fixturing approach
  • Floor space and power requirements
  • Preference for horizontal vs vertical workflow