How to Get Work for CNC Machine Capacity
A working guide to winning work for CNC machine capacity on a shop floor: which RFQs to quote, which to walk away from, and what to check before you promise a date. Written for engineers, sourcing staff and shop owners who need a repeatable intake process, not a list of marketplaces.
In this article
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Key takeaways
Qualify the RFQ Before You Spend Time on It
The fastest way to lose money on work for CNC machine capacity is to quote everything that lands in the inbox. A 40-part bracket in 6061-T6 with ±0.1 mm tolerances is a different job from a 5-axis impeller in Inconel with ±0.005 mm callouts. Both can be good work. They need different machines, different fixtures and different lead times.
Read the drawing before you read the quantity. Feature count, tightest tolerance and material removal volume set the real cost. A part with 12 holes and two slots on three faces is usually a 3-axis job with two setups. Add a contoured pocket on a fourth face and it becomes a 4-axis or 5-axis job. That single change can double the cycle time.
Check the material against what you actually stock or can buy quickly. 6061, 304 stainless, 1018 and C36000 brass are everyday. Inconel, Ti-6Al-4V and beryllium copper cut slower, wear tools faster and rarely sit on a shelf. If the customer needs Inconel, price the tooling and the extra inspection, not just the cycle time.
Set an intake rule and keep it. Ours is simple: any RFQ with a complete 2D drawing, 3D model and material callout gets a quotation and free DFM analysis within 12 hours. Anything missing a model gets a reply the same day asking for it. That one rule stopped us from quoting blind.
- 1Quote whenFull model, clear material, tolerance from ±0.005 mm to ±0.1 mm, quantity 1 to 10,000+
- 2Ask first whenNo 3D model, undefined finish, or tolerance tighter than the drawing datum allows
Match the Job to the Machine, Not the Other Way Around
Machine travel is the first filter. A 4,000 mm gantry job cannot go on a 500 × 500 × 450 mm VMC, no matter how good the programmer is. Check the envelope against the largest real dimension, not the bounding box in the CAD file. Clamps, vises and rotary tables eat space. A part that measures 480 mm can easily need 600 mm of travel once it is held.
Five-axis work is where margins usually hold up, but only when the part needs it. A one-off housing with five faces and compound angles is a natural 5-axis candidate. Ten thousand simple plates with two drilled holes are not. Putting easy parts on a 5-axis center wastes spindle time that a 3-axis machine could bill at a lower rate.
Watch the aspect ratio and wall thickness. A 300 mm long, 3 mm thin aluminum rib will chatter on a long reach. It may need a support fixture, a different toolpath or a slower feed. Price that in. If the customer will not accept the extra setup, the job belongs with someone who has a different process.
For turn work, check the diameter against the chuck and the bar feeder. Ø400 mm rotary table capacity handles most flanged parts; long shafts under 20 mm diameter need a steady rest or they will deflect. If the run is above 500 pieces, a mill-turn center removes a setup and usually pays for itself on labor alone.
- 13-axisPrismatic parts, 2-3 faces, tolerances to ±0.02 mm, best cost per part
- 24-axisParts with features on four faces, fewer setups, moderate complexity
- 35-axisCompound angles, contoured surfaces, one-setup finishing to ±0.005 mm
- 4Mill-turnShafts and flanged parts, Ø400 mm table, high volume with tight concentricity
Build a Quote That Survives Contact With Production
A quote is a small process plan. If you cannot name the setups, the tools and the inspection method, the number is a guess. Start with the cycle time for each setup, then add load and unload, tool changes and in-process checks. A 20-minute cycle rarely becomes a 20-minute part. It becomes 28 minutes with handling.
Price the finish, not just the cut. As-machined Ra 1.6–3.2 μm is standard off the machine. Ra 0.8–1.6 μm usually needs a finer stepover or a second pass. Ra 0.2–0.8 μm means polishing or lapping, which is manual time. Anodizing, electroless nickel and bead blasting are outside processes with their own lead time. List them as separate lines so the customer sees what drives cost.
Include the inspection level in writing. For medical and automotive parts we plan raw material check, in-process monitoring and final inspection, with reports on request. For a simple bracket, a first-article check plus spot checks may be enough. Saying this up front avoids the argument at shipment.
Leave a clear validity window and a quantity break. Material prices move. A quote that holds for 30 days protects both sides. Show price at 1, 10, 100 and 1,000 pieces so the customer can see where setup cost stops dominating, and so you can plan batch size instead of reacting to it.
- 1Never quoteWithout a setup list, tool list and inspection plan
- 2Always itemizeMaterial, machining, finish, inspection, freight
- 3Set validity30 days, with a note on material price movement
Certifications and Confidentiality Close More Jobs
Buyers in aerospace, automotive and medical do not buy machining hours. They buy evidence that the process is controlled. ISO 9001:2015 covers the quality system. IATF 16949:2016 is what automotive and EV programs ask for. ISO 13485:2016 covers medical devices. ISO 27001:2022 matters when customer drawings and models are sensitive. If you hold these, put the certificate numbers on the quote. If you do not, say what you do have instead of staying silent.
Confidentiality is part of the technical offer. Many OEMs will not send a 3D model until an NDA is signed. Having a standard NDA ready to send removes a week from the front end of every project. Uploads should be treated as secure and confidential by default, and files should be access-controlled by project, not shared across a general folder.
Capacity is the last trust signal. A customer who hears "we can do anything" trusts nothing. A customer who hears "16 simultaneous 5-axis centers, 27 three-axis machines, 4,000 mm maximum processing size, parts ship in 3–5 days" can check the claim against the part. Numbers beat adjectives every time.
References help, but only if they are real and relevant. A shop that has run medical housings can speak to a medical buyer. A shop that has only run signage cannot. Match the reference to the industry and let the buyer talk to someone who has already asked the same questions.
- 1QualityISO 9001:2015, IATF 16949:2016, ISO 13485:2016, ISO 27001:2022
- 2ConfidentialityNDA on request, secure and confidential uploads
- 3Capacity127 CNC machines, 3 plants, 7,600 m², 150 technicians
Seven Steps to Bring in Work for CNC Machine Capacity
Repeat this intake cycle for every RFQ. It takes about two hours of engineering time per quote.
- 1Log the RFQ and check completenessRecord customer, part number, quantity, material and required date in one sheet. Missing a 3D model, material callout or finish spec? Reply within the same business day and ask. Do not start estimating from a 2D drawing alone; you will miss features and underquote.
- 2Read the tightest tolerance and the datum schemeFind the smallest tolerance on the drawing. Anything at or below ±0.005 mm needs a temperature-controlled plan and a CMM check. Check that the datums are machinable in the setups you can hold. Datum callouts that reference a surface you cannot reach in one setup usually mean the designer expected a fixture you do not have.
- 3Pick the machine class and count setupsChoose 3-axis, 4-axis, 5-axis or mill-turn based on features per face. Count every setup, including the second op. Each setup adds 15-40 minutes of handling and a new stack of error. If the part needs five setups, ask whether a casting or a design change can cut it to two.
- 4Estimate cycle time and add real overheadCalculate cutting time from material removal rate for the alloy. Add 20-30% for tool changes, chip clearing and in-process checks. Inconel and titanium can run three to five times slower than 6061 on the same geometry. If the number looks too good, you missed a setup.
- 5Price finish, inspection and outside processesList anodizing, plating, powder coating, black oxide, bead blasting and polishing as separate lines with their own lead time. Note the inspection level: first article only, or 100% before shipment. Add laser marking as a line if the part needs traceability; minimum character height is 1.5 mm.
- 6Send the quote with a one-page DFM noteInclude price at 1, 10, 100 and 1,000 pieces, a 30-day validity, and one page of DFM feedback. Point out two or three changes that cut cost or improve machinability: looser tolerance on a non-critical face, a larger corner radius, a standard thread. Free DFM analysis within 12 hours wins work because it shows engineering, not sales.
- 7Review the result after every quoteTrack win rate, quoting hours, first-article pass rate and rework rate by customer. If a customer never converts after three quotes, stop quoting and ask why. If one customer sends repeat work at a stable tolerance band, that is the work to protect with capacity and priority.
Which Jobs to Quote, Hold or Decline
Use this as a first-pass filter before any estimating time is spent.
| Signal | Quote now | Ask first | Decline |
|---|---|---|---|
| 3D model + drawing | Both supplied | Model only | Neither supplied |
| Tightest tolerance | ±0.005 to ±0.1 mm | ±0.005 mm with thin walls | Tighter than machine capability |
| Material | 6061, 304, 1018, brass | Ti-6Al-4V, Inconel, PEEK | Unobtainable or restricted alloy |
| Quantity | 1 to 10,000+ | Single one-off with 6+ setups | Rush job with no drawing |
| Part size | Under 4,000 mm travel | Near the travel limit | Over the machine envelope |
| Finish | As-machined or anodize | Ra 0.2-0.8 μm polish | Undefined cosmetic spec |
| Certification | ISO 9001 / IATF 16949 scope | ISO 13485 with new process | Cert required and not held |
| Lead time | 3-5 days after PO | Prototype in 24 hours | Date impossible without overtime |
Quote the Jobs You Can Hold, Then Prove It
Winning work for CNC machine capacity comes from a fast, honest quote and a first article that matches the drawing. If the tolerance, material and envelope fit, say yes in 12 hours. If they do not, say no and explain why.
Frequently Asked Questions
Do I need a 5-axis machine to win higher-value work?
No, but it changes which jobs you can take. Many profitable parts are 3-axis brackets and plates with two setups. The 5-axis advantage shows up on parts with compound angles, contoured surfaces or features on five faces, where one setup replaces three and the tolerance stack shrinks.
If your work is mostly flat, plate-like parts, adding a 5-axis center will not fix your win rate. If you keep declining housings and impellers because you cannot hold the geometry, it will.
What is the minimum order quantity for a first job?
There is no minimum order quantity at our plants. A single prototype can go on the same floor as a 10,000+ part run. Starting with two to five parts is a sensible way for a new customer to test process control, inspection reporting and communication before committing to volume.
The first order is really a process audit. If the first article meets the drawing and the report arrives with the parts, the volume order is a smaller decision for the buyer.
How fast can a quotation come back?
Quotation and free DFM analysis within 12 hours of receiving a complete RFQ, meaning a 2D drawing, a 3D model and a material callout. Incomplete RFQs get a same-day reply asking for the missing file, which is faster than quoting from assumptions.
Production can start within 24 hours after the order is confirmed, and parts ship in 3–5 days for typical work. Historical late-delivery probability is below 2%.
How should I handle customer drawings and NDAs?
Treat every upload as secure and confidential. Keep files access-controlled by project rather than in a shared folder, and limit who can open the native CAD. Send a standard NDA before the model moves if the customer asks for one.
A ready NDA removes roughly a week from the start of a new program. It is one of the cheapest ways to look like a serious supplier.
What inspection documentation can be supplied with the parts?
Raw material check, in-process monitoring and final inspection are standard, with 100% inspection before shipment. Inspection reports are available on request, including first-article reports and dimensional reports against the drawing datums.
For medical and automotive programs, the report format is usually fixed by the customer. Send the template with the RFQ and it will be filled in the same structure.
Which materials cause the most quoting mistakes?
Titanium Ti-6Al-4V, Inconel and beryllium copper. They cut slowly, wear tooling and often need extra passes to hit finish. Quoting them at aluminum cycle times is the classic way to lose money on a job you already won.
PEEK and carbon fibre also surprise people. Both need sharp tooling, controlled feeds and often a different workholding approach than metals.
Send a Drawing and Get a Real Number
Upload a 2D drawing and 3D model to get a quotation and free DFM analysis within 12 hours, with no minimum order quantity.
12-hour quoteNo MOQ100% inspectionNDA on request
More Process Notes
We publish setup notes, tooling trials and inspection data from the factory floor.
