Supplier selection guide

Custom CNC Router Machining Services

This page is for engineers and buyers sourcing large-format routed parts: plates, frames, panels, housings. It lists the checks that decide whether a shop can actually hold your drawing, and the ones that quietly add cost.

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±0.005 mm tolerance4,000 mm travelNo MOQ3–5 day shipping

On this page

1
Key takeaways
2
Which machine class fits your routed part
3
Start with the part envelope, not the spindle
4
What tolerance a routed part can actually hold
5
The five things that move the price
6
How to tell a real router shop from a reseller
7
Step by step: from drawing to routed parts

Quick read

Key takeaways

Travel is the first filterIf the part is longer than 4,000 mm or wider than 1,150 mm, most shops cannot quote it at all.

Tolerance follows the setup±0.005 mm is achievable on rigid fixtured work. A part that flexes under its own weight will not hold it.

Thin walls drive the costA 2 mm wall on a 900 mm plate usually needs more passes and more handling, not a faster spindle.

Ask how many setupsThree setups means three chances for a position error. One setup usually means a 5-axis machine.

No MOQ changes the mathOne routed prototype and a 10,000-part run can come from the same process window.

Selection criteria

Which machine class fits your routed part

Pick by part envelope and feature count, not by spindle speed.

Part envelope	Best machine class	Typical tolerance	Watch out for
Up to 500 × 500 × 450 mm	3-axis mill	±0.005 mm	Deep pockets need long reach tooling
Up to 750 × 1,150 × 550 mm	4-axis mill	±0.005 mm	Rotary work needs a Ø400 mm table
Up to 4,000 × 400 × 150 mm	Long-bed router or gantry	±0.01 mm over full length	Thermal drift on long plates
Complex 5-face features	5-axis machining center	±0.005 mm	Higher hourly rate, fewer setups
Thin plate under 3 mm	Router with vacuum fixture	±0.05 mm	Chatter and bowing between clamps
One-off prototype	Router or 3-axis mill	±0.01 mm	Fixture cost can exceed part cost
10,000+ part run	Mill-turn or dedicated fixture	±0.005 mm	Setup repeatability over many batches

Envelope and rigidity

Start with the part envelope, not the spindle

The first question a router shop asks is not about material or finish. It is how big the part is. A 4,000 × 400 × 150 mm travel covers long frame rails, base plates, and gantry beams that will not fit on a standard vertical mill. Anything beyond that envelope has to be split into sections and joined, which changes the design.

Rigidity matters as much as size. A long plate clamped at two ends will sag in the middle. Light finishing passes at 0.2–0.5 mm depth and a sharp tool reduce the load, but they also stretch cycle time. If your drawing calls for ±0.005 mm across 2,000 mm, expect the shop to rough, stress-relieve, then finish in a separate pass.

Travel figures only tell you what fits inside the machine. They say nothing about whether the part can be held while it is cut. Ask for the fixture plan before you approve the quote. A vacuum table, a custom soft jaw set, or a bolted sub-plate all change the price.

For parts under 500 mm, a router is usually the wrong choice. A 3-axis mill with a smaller work envelope is stiffer, cheaper per hour, and easier to fixture. Route the long parts on the router and the small ones on the mill.

1
Long and flatFrame rails, base plates, mounting panels, gantry beams
2
Large with deep pocketsHousings and manifolds that need a long-reach tool
3
Thin and widePanels where clamping force will bow the part
4
Small and complexSend these to a 3-axis or 5-axis mill instead

Tolerance reality

What tolerance a routed part can actually hold

A ±0.005 mm callout is common on drawings and often unnecessary. On a routed part, that number only holds when the fixture is rigid, the material is stable, and the feature is measured in the same setup that cut it. Move the part to a second setup and you add position error from re-clamping.

Material choice moves the number more than most engineers expect. Aluminium 6061 and 7075 hold tight tolerances well. Stainless 316 and 17-4PH work-harden, so light passes and rigid tooling matter more. Titanium TC4 and Inconel push tool wear up, and the shop may need to slow the feed to keep the dimension.

Thermal drift is the quiet one. A 2,000 mm aluminium plate grows roughly 0.05 mm for every 2 °C of temperature change. If the shop measures the part straight off the machine, the reading may not match a measurement taken hours later in a metrology room.

A practical split: hold ±0.005 mm on critical bores and mating faces, and open general profile edges to ±0.1 mm. That single decision often removes one setup and cuts cost without touching function.

1
Critical featuresBores, bearing seats, mating faces at ±0.005 mm
2
General profileOuter edges and clearance holes at ±0.1 mm
3
Thin sectionsExpect ±0.05 mm once the wall drops under 3 mm
4
Long spansAdd a stress-relief step before final finishing

Cost drivers

The five things that move the price

Setup count is the biggest lever. Every additional setup adds fixture time, re-clamping error, and inspection time. A part that needs three setups can cost noticeably more than the same part cut in one 5-axis pass, even at a higher hourly rate.

Wall thickness drives cycle time. A 2 mm wall on a 900 mm plate needs light passes to avoid chatter, and the shop may run a semi-finish pass before the final cut. Thicker walls allow heavier cuts and fewer passes.

Surface finish is a cost curve, not a checkbox. As-machined at Ra 1.6–3.2 μm is standard. Ra 0.8–1.6 μm needs a finishing pass. Ra 0.2–0.8 μm usually means extra time, finer tooling, or a secondary process such as polishing.

Material and quantity round it out. Exotic alloys and titanium run slower than 6061. Small quantities carry proportionally more programming and fixture cost. Large runs spread that cost and let the shop build a dedicated fixture that improves repeatability.

Finishing adds a step, not just a line item. Anodizing, bead blasting, and laser marking all sit after machining, so they add days and handling. Plan them into the schedule from the start.

1
Setup countOne setup beats three, even at a higher rate
2
Wall thicknessLight passes for thin walls, heavier cuts for thick stock
3
Finish specRa 0.2–0.8 μm is a different process, not a tweak
4
QuantityDedicated fixtures pay back on repeat runs

Supplier checks

How to tell a real router shop from a reseller

Ask for the machine list, not a capability statement. A shop that runs 16 simultaneous 5-axis centers, 12 four-axis mills, and 27 three-axis machines can match the process to the part. A reseller will quote everything as if it fits one machine.

Ask about inspection. A 100% inspection before shipment, with raw material checks and in-process monitoring, is the baseline for parts that carry a tolerance callout. Reports on request should be normal, not a favor.

Ask about certification coverage. ISO 9001:2015 covers general quality systems. IATF 16949:2016 matters if the part goes into a vehicle. ISO 13485:2016 applies to medical devices. ISO 27001:2022 covers how your drawings and files are protected.

Ask how the quote was built. A number without a DFM note is a guess. A quote that flags a thin wall, a tight tolerance that adds a setup, or a feature that needs a special tool is one you can trust more.

Finally, ask about confidentiality. Uploads should be secure, and an NDA should be available on request before you send production drawings.

1
Machine listMatch the process to the part, not the other way around
2
Inspection planRaw material, in-process, and final checks
3
CertificationsISO 9001, IATF 16949, ISO 13485, ISO 27001
4
DFM feedbackA quote that flags risk is worth more than a low number

Ordering process

Step by step: from drawing to routed parts

Follow this order and most surprises disappear before the spindle starts.

1
Send the 3D model and a 2D drawingInclude STEP or IGES plus a PDF with tolerances, material, finish, and quantity. Note which dimensions are functional and which are reference.
2
Get the DFM review and quoteWe return a quotation and free DFM analysis within 12 hours. Read the DFM notes before the price. A thin wall or a tight tolerance is easier to fix now.
3
Confirm the fixture planFor long or thin parts, agree on how the part is held: vacuum table, soft jaws, or a bolted sub-plate. This decides whether ±0.005 mm is realistic.
4
Approve material and finishAluminium 6061-T6, 7075, stainless 316L, titanium TC4, and engineering plastics are all in stock range. Confirm finish at the same time, since anodizing adds a separate step.
5
Production startsProduction can start within 24 hours of approval. First-article inspection runs before the full batch, and the setup is locked once it passes.
6
In-process monitoringCritical dimensions are checked during the run, not only at the end. This catches tool wear before it becomes a batch of scrap.
7
Final inspection and shipping100% inspection before shipment, with reports on request. Parts ship in 3–5 days. Historical late-delivery probability is below 2%.
8
Plan the finishing windowIf the part needs anodizing, plating, or laser marking, add that time to the schedule. Minimum laser character height is 1.5 mm.

FAQs

Questions buyers ask before ordering

Is a CNC router the same as a CNC mill?

They share the same control logic but differ in rigidity and work envelope. A router is built for large, relatively flat parts and often uses a moving gantry. A mill has a smaller, stiffer frame and holds tight tolerances more easily on compact parts.

For a 2,000 mm frame rail, the router wins. For a 200 mm bracket with a ±0.005 mm bore, the mill is the better tool. Some parts need both, and that is normal.

What is the largest part you can machine?

The largest travel on our equipment is 4,000 × 400 × 150 mm. Medium envelopes include 750 × 1,150 × 550 mm and 600 × 600 × 600 mm. Compact machines cover 500 × 500 × 450 mm and 500 × 310 × 200 mm.

If your part exceeds 4,000 mm, it has to be split into sections. We will flag that in the DFM review so you can decide whether joining is acceptable for the design.

Can you hold ±0.005 mm on a long part?

Yes, on features that are cut and measured in the same rigid setup. Long spans add thermal drift, so the shop may rough, stress-relieve, and then finish in a separate pass.

The practical approach is to keep critical bores and mating faces at ±0.005 mm and open general profile edges to ±0.1 mm. That keeps the tight tolerance where it functions and removes unnecessary cost elsewhere.

What is the minimum order quantity?

There is no minimum order quantity. We run from one prototype to 10,000+ part runs. Small orders carry more programming and fixture cost per part, while large runs let us build a dedicated fixture that improves repeatability.

For a first order, a single routed prototype is often the fastest way to confirm fit and finish before committing to a batch.

How do you protect our drawings?

Uploads are secure and confidential. An NDA is available on request before you send production files. Our quality systems include ISO 27001:2022, which covers information security management.

Only the engineers who need the files for programming and inspection have access to them.

Which finishes can you apply after routing?

Anodizing in clear, colour, hardcoat, and conductive types; electroless nickel, zinc, silver, and gold plating; powder coating and black oxide; bead blasting, tumbling, brushing, and polishing; and laser marking or engraving.

Laser marking needs a minimum character height of 1.5 mm to stay legible after finishing.