Fort Wayne CNC Processing Guide
This Fort Wayne CNC processing guide explains how a metal part moves from a Fort Wayne drawing to a finished component: how the process is routed, where 5-axis setup earns its cost, and which tolerances and finishes are realistic. It is written for design engineers, manufacturing engineers and buyers who need to judge a quote rather than collect slogans.
In this article
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What a Fort Wayne CNC processing guide actually decides
A processing guide is not a list of machine names. It is the order of operations on one part: which face is cut first, where the part is held, which features are finished in the same setup, and which inspection points prove the result. Change the order and you change the cost, the tolerance stack and the scrap rate.
Fort Wayne sits in a metalworking region built around automotive and heavy equipment supply, so drawings from that area tend to carry the habits of that supply base: tight bore-to-bore relationships, flatness callouts across long castings, and material certificates expected with the shipment. Those habits shape routing more than the alloy does.
GreatLight runs this routing from Dongguan with three wholly-owned plants, 7,600 m² of floor space and 150 technicians. The equipment list matters only because it sets what the process can hold: 127 high-precision CNC machines, 16 simultaneous 5-axis machining centers, 12 four-axis mills, 27 three-axis machines and 16 mill-turn centers.
One caution before we go further. A process that works on a 40 mm aluminum bracket often fails on a 900 mm steel housing. The same engineer, the same CAM software, a different result. The rest of this page is about that gap.
Five-axis setup: when the extra axes pay for themselves
Five-axis machining cuts more than one face without releasing the part. That single fact removes most of the error that comes from re-clamping. On a part with a Ø40 mm bore and a matching face, holding both in one setup can keep the perpendicularity inside ±0.005 mm. Split the operations and the same drawing may need a fixture that costs more than the machining.
The trade is access and rigidity. A trunnion table reaches angles a three-axis vise cannot, but it also adds a rotating mass and a longer tool gauge length. Deep pockets in hard steel are usually better on a three-axis machine with a short, thick cutter, then finished on a five-axis center only for the angled features.
Undercuts, port intersections and blended radii are the classic five-axis work. So are parts that need drilling on four sides, such as manifolds, gearbox covers and sensor housings. If the part is a flat plate with holes on one face, five-axis adds setup time and buys nothing.
Use this test on your own drawing: count the number of setups a three-axis route needs. Three or more, with a positional tolerance between them, is the point where simultaneous five-axis usually wins on total cost.
Tolerance, surface finish and what the process can hold
Tolerances are cumulative along the operation sequence. A ±0.005 mm callout between two features means both must be cut, or both must be probed, in the same setup. If a designer puts that tolerance across a joint between two separately machined parts, the process cannot deliver it, and no amount of inspection will fix the drawing.
Surface finish is a separate decision. As-machined faces land around Ra 1.6–3.2 μm. A controlled finish pass reaches Ra 0.8–1.6 μm. Fine finishing with a small stepover and a sharp insert reaches Ra 0.2–0.8 μm, but cycle time rises and the tool must be changed more often, so reserve it for sealing faces, bearing seats and slideways.
Material behavior sets the boundary. Aluminum 6061 and 7075 cut freely and hold thin walls well. Stainless 316 and 17-4PH work-harden, so the feed must stay above the work-hardening threshold or the next pass will rub instead of cut. Inconel and Ti-6Al-4V need lower cutting speeds, more coolant and a rigid setup; the geometry is the same, the cycle is not.
A practical read: if the wall is thinner than 1 mm over 50 mm of length, expect to discuss support, fixturing and a possible design change before the first chip.
Process control from raw material to inspection
Inspection is a process step, not a final gate. At GreatLight the sequence is raw material check, in-process monitoring and final inspection, with reports on request. The qualification rate across that flow is 99.99%. The number is a result of catching deviations early, not of inspecting harder at the end.
Material traceability starts at the bar or plate. Heat number, alloy and condition are recorded before cutting. For a Fort Wayne automotive program, that record is what makes an IATF 16949:2016 audit pass. For a medical component, the same record supports ISO 13485:2016. Our other certificates are ISO 9001:2015 and ISO 27001:2022.
In-process checks matter most on second operations. When a part is re-clamped, the operator verifies the datum before cutting the next feature. On a five-axis cell, probing inside the cycle does the same job. Either way, the point is to stop a drifting process before a batch is finished.
Every part is inspected before shipment. That does not mean every dimension on every part is measured by a CMM. It means the control plan is followed: critical features measured, cosmetic faces checked, and the parts packed with the paperwork that matches the program.
Quoting and lead time in a real Fort Wayne program
A quote is only useful if it arrives while the decision is still open. We return a quotation and a free DFM analysis within 12 hours. That DFM note is usually more valuable than the price: it flags a tolerance that needs a different setup, a wall that will deflect, or a corner radius that forces a smaller cutter and a longer cycle.
Production can start within 24 hours of approval, and parts ship in 3–5 days. Historical late-delivery probability is below 2%. Those numbers assume the drawing is frozen and the material is standard stock. A special alloy or a hardcoat finish adds time, and we say so in the quote rather than after the order.
There is no minimum order quantity. One prototype and a 10,000+ part run go through the same process plan; only the fixture and the inspection sampling change. Prototypes are often the cheapest way to prove a setup before committing to production tooling.
Uploads are secure and confidential, and an NDA is available on request. For programs with proprietary geometry, that is the first document signed, not the last.
Which machine class fits the part
Use the feature pattern first, then the part size.
| Part pattern | Recommended route | Why it fits | Watch for |
|---|---|---|---|
| Flat plate, holes on one face | 3-axis mill | Shortest setup, rigid vise | Burrs on the exit face |
| Four-sided drilling, port blends | 5-axis simultaneous | One setup, no re-clamp error | Tool gauge length |
| Shaft with flats and threads | Mill-turn center | Turning and milling in one cycle | Bar pull length |
| Thin wall, deep pocket | 3-axis rough, 5-axis finish | Rigid roughing, accurate finishing | Chatter in the finish pass |
| Long housing, 4,000 mm | Large-travel 5-axis | Travel 4,000 × 400 × 150 mm | Thermal drift over the length |
| Prototype, near-net casting | 5-axis + adaptive clearing | Fixtures cut from stock | Datum choice on rough faces |
Where the process is a good fit, and where it is not
Match the part to the route before comparing prices.
| Situation | Good fit | Marginal | Better alternative |
|---|---|---|---|
| One-off prototype | 5-axis from stock | Hard tooling needed | Rapid prototyping |
| 10,000+ identical parts | CNC with fixtures | Complex geometry only | Die casting plus machining |
| Thin-wall aluminum housing | 3-axis plus 5-axis finish | Wall under 0.8 mm | Design change to add ribs |
| Sealing face, Ra 0.8 μm | Finish pass on 5-axis | As-machined only | Lapping after machining |
| Long 4,000 mm structural part | Large-travel 5-axis | Over 4,000 mm | Split design or fabrication |
| Hardened 17-4PH part | Mill-turn, low speed | Deep small holes | EDM for the fine detail |
The short version
If your part needs three or more setups to reach its tolerances, route it through simultaneous 5-axis and hold the critical features in one setup. If it is a flat plate with one working face, a three-axis machine will match the quality at lower cost. Choose the route from the feature pattern, not from the machine list.
Questions engineers ask before releasing a job
Can you hold ±0.005 mm on a part with features on four sides?
Yes, when those features are cut in one five-axis setup or verified by in-cycle probing. The tolerance is a property of the setup, not of the machine alone.
If the drawing closes the tolerance across two separately clamped operations, we will ask to move the datum or open the callout. That change usually costs less than the fixture needed to hold the original.
How do you decide between machining a casting and cutting from solid?
It comes down to volume and wall thickness. A near-net casting pays for itself when the same geometry repeats and the walls are thick enough to machine without deflection.
For one prototype or a low-volume run, cutting from solid avoids tooling cost and shortens the schedule. We quote both when the quantity sits in the middle.
What surface finish should I specify for a sealing face?
Ra 0.8–1.6 μm is the usual target for an O-ring or gasket face, and it also controls the machining marks that create leak paths.
Going below Ra 0.8 μm is possible but adds a finishing pass and more tool changes. Specify it only where the seal design or the fluid demands it.
Which materials cause the most scheduling risk?
Titanium Ti-6Al-4V, Inconel and hardened stainless. They cut slowly, wear tools faster and need lower speeds with more coolant.
Aluminum 6061, 7075 and free-machining brass are the least risky. If your schedule is tight, the alloy choice on the drawing has as much effect as the machine choice.
How is confidentiality handled on a proprietary part?
Uploads are secure and confidential, and an NDA is available on request. We can sign before the drawing is transferred.
If a program needs a paper trail, ask for the NDA at the quoting stage rather than at the order stage.
Do you inspect every part or sample from the batch?
Every part is inspected before shipment, with raw material check, in-process monitoring and final inspection behind it. Inspection reports are available on request.
The sampling plan depends on the part: critical features on every piece, cosmetic faces by visual check, and full layout reports where the drawing asks for them.
Send the drawing, get a process plan with the price
Upload your STEP file and we return a quotation with a free DFM analysis within 12 hours. You get the routing, the tolerance risks and a realistic lead time in the same document.
12-hour quote and DFM±0.005 mm tolerance100% inspectionNo minimum order quantity
More process notes
We publish setup notes, tooling trials and inspection data from the factory floor.
