Your drawing is ready, the quote comes back, and the number is higher than you planned. A good place to start is the CNC Milling vs Turning question: which machine the part runs on, how it is held, and how many times it is set up. At Custom Concepts Machining in Leamington, Ontario, our team answers that question first on every drawing, because the answer shapes the cost lines in your quote.
This guide explains how each process works in our shop, how we match a component’s geometry to the right machine, what drives the price, and what to ask any supplier before you place a batch order.
CNC Milling vs Turning: How Each Process Removes Metal
In our shop, both processes start with solid stock and cut away everything that is not the component. The difference is what moves: the workpiece or the tool.
CNC Turning: The Part Spins
On our CNC lathes, a chuck or collet holds the workpiece, and the spindle spins it around its centre axis. The cutting tool does not spin. It feeds along the workpiece to turn the outside diameter, bore the inside, and cut grooves, tapers, undercuts, chamfers and threads. Common examples of turned work in our shop include shafts with bearing seats, pins, bushings, sleeves, spacers, rollers, pulleys and threaded rods.
CNC Milling: The Tool Spins
On our CNC mill machine, the roles reverse. The workpiece stays clamped to the machine table in a vise or fixture, and the spindle spins a cutter with several cutting edges. The cutter moves in several directions to cut flat surfaces, pockets, cavities, slots and profiles, and to drill holes. Common examples of milled work include brackets, plates, enclosures, manifolds with ports, valve bodies, and mold inserts and cores.
If your component has features on several faces, ask any shop about its milling capabilities. Will it use a multi-axis setup, or will it re-clamp the part several times?
Which Process Does Your Part Need?
When a drawing arrives, our first question is about geometry. Is this part mostly round, mostly flat, or a mix of both? The answer tells us which machine to start on. James, who leads CAD design and prototyping, reviews the model before we quote and flags any geometry that changes the plan.
|
Part shape |
Examples |
Where our review starts |
|---|---|---|
|
Mostly round |
Shafts, pins, bushings, sleeves |
CNC lathe |
|
Mostly flat or square |
Brackets, plates, valve bodies, mold inserts |
CNC mill |
|
Round with flat features |
Shafts with a keyway slot, flanges with bolt patterns |
Lathe and mill, both in our shop |
Round Parts Go to the Lathe
If every feature shares one centre axis, the part starts on our lathe. That is where we turn its diameters, shoulders, bearing seats, grooves and threads.
Flat and Prismatic Parts Go to the Mill
If the geometry is built from flat surfaces, pockets and hole patterns, the part starts on our mill. Plates, brackets and housings for automation assemblies fall into this group.
Hybrid Parts: Mill-Turn and Live Tooling
Some components mix both shapes, such as a shaft with a keyway slot or a flange with a bolt circle. If a supplier quotes mill-turn centre or live-tooling work for a part like this, ask two questions. Does the part run on a single machine or move between two? How many setups does it need?
The advantage at Custom Concepts Machining is simple: milling and turning happen under one roof. A hybrid component never ships to a second vendor between operations.
How the Process Choice Changes the Price
The manufacturing route sets the main cost lines in every quote we build. Our team weighs three of them.
Material and Workholding
In our shop, turned parts start as round bar or tube. Milled parts start as plate, bar or billet in steel, aluminum or stainless. We match the stock size to your finished geometry, and that choice sets our material cost and how much metal we remove.
We hold each workpiece in a standard chuck, a vise with soft jaws or a dedicated fixture, and we price that holding method into the setup. If your quote includes a fixture charge, ask whether the shop keeps that fixture for repeat orders.
Cutting Time and Tool Wear
Cycle time is the minutes each workpiece spends in the machine, and that time repeats for every part in the batch. We estimate it from the toolpath for your part. Spindle speed, feed rate, stepovers and tool changes all go into that estimate. If two suppliers price the same drawing far apart, ask each one for its expected cycle time per part.
Setups and Re-Clamping
In our shop, every time a workpiece is unclamped, flipped or moved to another machine, a machinist resets it and runs a quality check before the run continues. When James reviews your drawing, he looks for ways to cut the setup count and simplify the setup sequence without changing how the component works.
How Batch Size Changes Your Cost per Part
In our quotes, setup work is counted once per run, and run time is counted once per part. To see how the two add up for your order, ask for pricing at more than one quantity:
- A quote at your current need, for example 50 units.
- A quote at your expected annual volume, for example 250 or 500 units.
- A breakdown of one-time costs, such as programming and fixtures, versus costs that repeat on every order.
Our shop runs batches from 50 to 500+ units, plus emergency runs of 2 to 20 pieces when a factory line is down. We keep programs and setup notes on file, so repeat clients start each new order from the last approved run instead of from scratch.
Tolerances, Finish and Design Choices That Cut Cost
Tolerances are one of the first things we price on either machine. Before you send a drawing, have your engineering team mark the features that need precision and accuracy. Every other feature can follow the general tolerance note in your title block.
Check the drawing standard named on your title block, such as ASME Y14.5 or ISO 1101. Then confirm the shop reads each geometric control the same way your engineers do. If surface finish matters, put a roughness value on the drawing instead of a word like “smooth.”
A design-for-manufacturing review with James covers questions like these:
- Can this diameter come from a bar size we can source quickly?
- Can that internal corner take a radius that matches a standard cutter?
- Which tolerances are functional, and which can relax?
- Can features move to fewer faces so the part needs fewer setups?
We would rather ask these questions before the first chip than after the first article.
CNC Milling and Turning FAQs
Is CNC turning cheaper than CNC milling?
It depends on the part. Geometry, complexity, material, tolerances, setup count and quantity all feed the price. If your component could run either way, ask us to quote both routes. Then you can compare real numbers for your own drawing.
Can one machine do both milling and turning?
Ask any supplier whether your part will run on a single machine or two, and how many setups it needs. At Custom Concepts Machining, both processes run in the same shop, so your part stays with one team from bar stock to finished batch.
Which process holds tighter tolerances?
It depends on the feature and on the standard your drawing uses. Send us the drawing and ask which precision tolerances we can hold on your specific features. Then confirm that answer in writing on the quote.
Send Your Drawing to Custom Concepts Machining
You do not need to know which process your part needs before you call. Our team will work that out. These details give you the most accurate quote:
- A 2D drawing or a 3D model file, such as STEP
- Material and grade
- Quantity, plus expected annual volume
- Critical tolerances and surface finish
- Required delivery date
Call (519) 325-0804 or send your files through the contact form. Our shop at 4 Iroquois Road in Leamington runs CNC milling and turning under one roof, from single prototypes and emergency runs to batches of 500+ units. Send the drawing, and Custom Concepts Machining will show you which route it takes and what CNC Milling vs Turning means for your price.