Startup guide

How to Start CNC Machining Business?

A shop-floor guide for machinists and engineers who want to start a CNC machining business that survives past the first year. We cover machine selection, quoting math, tolerance limits, and how to win a first paying job without buying capacity you cannot fill.

Get Instant Quote Talk to an Engineer

3 plants127 CNC machines±0.005 mmNo MOQ

On this page

1
Key takeaways
2
What the market actually buys
3
Machines, spindles, and the tolerance you can hold
4
Quoting math that keeps you solvent
5
Fixtures, first articles, and the mistakes that cost the most
6
Step by step: from empty floor to first invoice
7
Which machine and process fits which job

Quick answers

Key takeaways

Start with 3-axis, not 5-axisA 3-axis mill plus a lathe covers most first jobs. Add 5-axis when the quoting queue says so.

Quote from cycle time, not from hopePrice = material + machine rate × cycle time + finishing + inspection + scrap allowance.

Pick a niche before a buildingAutomotive brackets and medical housings need different certifications, coolant, and chip handling.

Tolerances drive your machine choiceAbove ±0.05 mm you can stay on a used 3-axis. Below ±0.01 mm you need thermal control.

Your first hire is a setup machinistOne person who can set up, run, and inspect keeps the spindle turning.

Section 1

What the market actually buys

Before you sign a lease, understand who pays for machined parts and why. Most first orders come from three places: a product company that needs 20 to 200 units of a bracket or housing, a design firm that needs prototypes in five days, and a larger shop that is overflowing with low-volume work. Each buyer cares about different things. The product company cares about repeatability across a run. The design firm cares about speed. The overflow shop cares about whether you can hold their tolerance without babysitting the machine.

Call ten potential buyers in your region and ask one question: what part is hardest to get made right now? You will hear the same answers. Small lots of stainless parts. Anything with a tight bore. Anything that needs two setups and a fixture. Those answers tell you what to buy and what to quote. They also tell you what to refuse in month one, which matters more than what you accept.

Do not start by listing every service you can imagine. If you advertise five-axis, EDM, and sheet metal on day one, buyers will test you on all three. Most new shops fail the first test and lose the relationship. Pick one process family. Get good at it. Add the second process only when a paying customer asks for it twice.

1
Small lots win first20–200 unit runs are where new shops get a foot in the door.
2
Ask buyers what is hardTheir answers define your machine list and your quote sheet.
3
One process at a timeAdvertising everything on day one invites tests you will fail.

Section 2

Machines, spindles, and the tolerance you can hold

The tolerance you promise decides the machine you buy. A used 3-axis vertical mill with a 40-taper spindle and box ways can hold ±0.05 mm all day in aluminum with a good operator. Push it to ±0.01 mm and you need thermal stability, a temperature-controlled room, and a machine that has been leveled and re-scraped. Below ±0.005 mm you are into grinding, jig boring, or a newer machine with linear scales on every axis.

For a first purchase, a 3-axis mill with travels around 500 × 400 × 400 mm and a CNC lathe with a Ø200 mm chuck cover a wide range of work. Buy machines with a known control platform. Fanuc and Mitsubishi controls have the widest support network, which matters when a drive fails on a Friday. Avoid orphan controls, even if the machine is cheap. A $15,000 mill with a dead control is a $15,000 table.

Spindle taper and tooling matter as much as the machine. CAT40 or BT40 holders are cheap and everywhere. HSK-A63 gives better runout at high speed but costs more per holder. If you plan to run small end mills under Ø3 mm, buy holders with low runout and a shrink-fit or hydraulic chuck. A good holder on a mid-range machine beats a bad holder on a good machine every time.

Power and air are the hidden costs. A 15 kW spindle needs a service that most industrial units already have, but a small unit may not. Add a screw compressor, a refrigerated dryer, and a mist or flood coolant system. Budget for chip removal from day one. A shop that shovels chips by hand loses an hour a day and the operator's back.

1
±0.05 mmAchievable on a used 3-axis mill with a good setup.
2
±0.01 mmNeeds thermal control and a machine in good mechanical shape.
3
±0.005 mmNeeds linear scales, a controlled room, and a careful process.
4
Stick to common controlsFanuc and Mitsubishi have the widest support network.

Section 3

Quoting math that keeps you solvent

Most new shops underquote because they forget the non-cutting time. A part that takes 12 minutes of cutting may take 40 minutes of setup, fixturing, and inspection on a 20-piece run. If you quote only the cutting time, you lose money on every small lot. Build a quote sheet that adds setup time, programming time, material, finishing, inspection, and a scrap allowance of 5 to 10 percent on the first run.

Machine rate is the number people argue about most. A common starting point is $40 to $60 per hour for a 3-axis mill in a small shop, and $75 to $120 per hour for 5-axis work. These are not prices you must charge. They are internal numbers that tell you whether a job pays for the floor space it occupies. If a job cannot cover its machine rate plus overhead, decline it and keep the spindle free for work that can.

Material cost is easy to underestimate on stainless and titanium. A 6061 aluminum block might cost $8. The same size in 17-4PH stainless can cost $60 or more, and it machines four times slower. Quote material by weight from a real supplier quote, not from a guess. Add 10 percent for drop and a second 5 percent for the parts you will scrap while dialing in the first setup.

Finishing and inspection are where quotes quietly fail. Anodizing, bead blasting, and laser marking add days and dollars. A first article inspection report with a full dimensional layout can take two hours on a complex part. If the customer's print calls for it, quote it. If the print is silent, ask. Never assume the customer will skip inspection. They rarely do.

1
Add setup timeA 20-piece run can spend 40 minutes on setup for 12 minutes of cutting.
2
Scrap allowance5–10 percent on the first run of a new part.
3
Quote material from a real priceStainless and titanium cost far more than aluminum and cut slower.
4
Inspection is billableA full dimensional layout can take two hours on a complex part.

Section 4

Fixtures, first articles, and the mistakes that cost the most

The first article is the most expensive part you will make. Plan for it. On a 3-axis mill, use a vise and soft jaws for the first operation, then flip the part into a machined pocket for the second. On a lathe, use a collet or a bored set of soft jaws. Avoid clamping on a finished surface. If the print has a tight bore and a tight outside diameter, machine the bore in the same setup as the outside whenever the geometry allows.

Thermal drift is the silent killer of tight tolerances. A spindle that has run for 30 minutes is longer than a cold spindle. On a ±0.01 mm part, let the machine warm up for 20 to 30 minutes and check a test cut before running production. Keep the shop temperature stable. A door that opens onto a hot parking lot will move your numbers more than a worn ball screw.

Tool wear changes dimensions gradually. On a 100-piece run, check the critical dimension every 10 to 20 parts and adjust the offset. On stainless and titanium, expect the tool to wear faster. Keep a spare of every tool you use. A broken Ø6 mm end mill in the middle of a run costs more in downtime than the tool costs to buy.

Deburring is real work. A part with a sharp edge will come back. Budget time for hand deburring, tumbling, or a chamfer pass on the machine. If the print calls for a specific edge break, put it in the program. If it does not, still break the edge. Customers notice a burr more than they notice a good surface finish.

1
Warm up the spindle20–30 minutes before running tight-tolerance production.
2
Check every 10–20 partsAdjust the offset as the tool wears, especially on stainless.
3
Break every edgeA burr is the first thing a customer feels and the last thing you want to fix.

Action plan

Step by step: from empty floor to first invoice

Seven steps in the order that keeps cash moving.

1
1. Define one process and one materialPick 3-axis milling in aluminum and stainless, or turning in steel and brass. Write it on the quote sheet. Refuse work outside it for the first six months.
2
2. Buy a used 3-axis mill and a CNC latheLook for 500 × 400 × 400 mm travels, CAT40 or BT40, and a Fanuc or Mitsubishi control. Budget for rigging, power, air, and coolant on top of the machine price.
3
3. Set up the room for temperature and chipsKeep the shop between 18 and 22 °C. Add a chip conveyor or a wheelbarrow and a chip bin. Install a compressor and a refrigerated dryer before the first job.
4
4. Build a quote sheet before the first inquiryColumns for setup, programming, cycle time, material, finishing, inspection, and scrap. Use $40–$60 per hour for 3-axis and $75–$120 per hour for 5-axis as internal rates.
5
5. Make a first article and measure it fullyMachine one part, inspect every dimension on the print, and record the numbers. Adjust the process, then run the rest. Keep the first article as a reference.
6
6. Run the first lot with an in-process checkCheck the critical dimension every 10–20 parts. Adjust offsets as tools wear. On a 100-piece run, expect to touch the offset two or three times.
7
7. Invoice, then ask for the next part numberSend the inspection report with the invoice. Ask the buyer what else is hard to get made. That question is how a first job becomes a second one.

Decision table

Which machine and process fits which job

Use this to decide what to buy and what to quote.

Job type	Best process	Tolerance range	Watch out for
Prototype bracket, 5–20 pcs	3-axis mill, vise + soft jaws	±0.05 mm	Setup time eats the margin
Housing with two faces	3-axis mill, two setups	±0.02 mm	Datum shift between setups
Shaft with a shoulder	CNC lathe, collet chuck	±0.01 mm	Thermal drift on long runs
Complex contoured part	5-axis or 3+2	±0.01 mm	Fixture collision and reach
Tight bore, tight OD	Mill-turn or one-setup lathe	±0.005 mm	Clamping distortion
Stainless small lot	3-axis mill, carbide tooling	±0.02 mm	Tool wear and work hardening
Aluminum plate, large part	3-axis mill, 4,000 mm travel	±0.05 mm	Chip evacuation and flatness

Start small, quote carefully, and measure everything

A new CNC shop survives on one process, one material, and a quote sheet that includes setup and inspection. Buy the second machine when the quoting queue, not the showroom, tells you to.

Get Instant Quote Talk to an Engineer

FAQs

Frequently asked questions

How much does it cost to start a CNC machining business?

A small shop with one used 3-axis mill, one CNC lathe, tooling, a compressor, and basic inspection equipment can be set up for the price of the machines plus roughly 20 to 30 percent for rigging, power, air, and coolant.

The number varies too much by region to give a single figure. The bigger risk is buying too much capacity before you have paying work. One mill and one lathe that run six hours a day beat three machines that run one.

Do I need a 5-axis machine to start?

No. Most first jobs are 2.5D or 3-axis work: plates, brackets, housings, and shafts. A 3-axis mill plus a lathe covers them.

Add 5-axis when a paying customer asks for a contoured part that cannot be reached in two or three setups, or when the setup time on 3-axis work is eating your margin.

How do I price my first job?

Add setup, programming, cycle time, material, finishing, inspection, and a 5 to 10 percent scrap allowance. Multiply machine time by an internal rate of $40 to $60 per hour for 3-axis work.

If the total does not cover the floor space and the operator's time, decline the job. A full spindle on a paying job is worth more than a busy spindle on a losing one.

What tolerance can a new shop realistically hold?

With a used 3-axis mill in good mechanical shape, ±0.05 mm is routine and ±0.02 mm is achievable with care. Below ±0.01 mm you need thermal control, a warm spindle, and linear scales.

Do not promise a tolerance the machine cannot hold on its worst day. Quote the tolerance you can measure, not the one on the print.

Do I need ISO certification to get customers?

Not for the first job. Most small buyers care about the part, the paperwork, and the delivery date. They will ask for a material cert and an inspection report before they ask for a certificate.

ISO 9001 becomes important when you quote automotive, medical, or aerospace work. Those buyers audit the process, not just the part. Plan for it when your order book justifies the cost.

How do I find the first customer?

Start with the companies within driving distance that make products using machined parts. Call them and ask what is hard to get made. Offer a small lot at a fair price with a real inspection report.

Overflow work from larger shops is another route. Those shops often have more work than capacity and will send small lots to a reliable local supplier.