Machined Metal Parts

1. How does the manufacturer's capacity set lead times?

The 100+ machines and the 3/7/30-day tiers are linked. Breadth of equipment means a job routes to the machine that cuts it fastest, and a 6,800 m² floor with 100+ employees runs prototype and production volumes without rescheduling the whole shop. A narrow shop slips; a broad one absorbs.

The link cuts both ways. A manufacturer that quotes a short date against a narrow floor will quietly push your job when a larger order lands. Ask for the machine mix behind the date, not the date alone — a promise with no routing behind it is a guess.

2. Which machine mix keeps a lead time short?

Every setup a part avoids is a day it saves. The machine mix is what makes that possible: a 5-axis center cuts a complex part in one setup, and a mill-turn lathe holds concentricity on a cross-drilled part without a second operation.

Process	Capacity	Lead-time effect
3-axis milling	50+ centers	Fast for flat, prismatic parts
4-axis milling	20+ centers	Indexed features without refixturing
5-axis milling	20+ centers	Angled faces in one setup
CNC turning	25+ lathes	Round parts, up to Ø720 × 1280 mm
Mill-turn	Multi-task centers	One setup for concentric parts
Grinding	7+ machines	±0.002 mm finishes

The point is not the machine count alone. It is that the mix lets the planner pick the fewest-setup route: an angled face goes on the 5-axis, a cross-drilled round part stays on the mill-turn. Fewer setups means fewer chances to lose a day to fixturing.

3. Which materials does the manufacturer run on schedule?

Material availability is part of the schedule. We machine the alloys buyers draw and XRF-check every incoming lot against the mill certificate, so a material problem does not surface as a late shipment.

Material family	Grades	Lead-time note
Aluminum	6061, 6063, 6082, 7075	Fast, widely stocked
Stainless steel	303, 304, 316, 17-4PH	Common grades on hand
Alloy steel	1018, 1045, 4140, 4340, 12L14	12L14 free-machining
Brass / copper	C360, H62, C110	Free-cutting
Titanium	TA2, TC4	Slower cutting, plan accordingly
Plastics	ABS, POM, nylon, PTFE, PEEK	Soft, fast

4. How do secondary operations stretch the schedule?

Secondary operations are where lead times quietly grow. A part that needs anodizing, plating, or heat treatment leaves the building for a qualified partner, and that hand-off adds days. We run these in parallel where possible and state the honest total up front.

• Surface finishing: standard and hard anodizing, plating, powder coating, painting, brushing, polishing.
• Heat treatment: vacuum, bright, carburizing, nitriding, stress-relief aging. In-house ovens reach 500 °C; titanium stress relief above that goes to a qualified partner.

5. What tolerance capacity backs the schedule?

A tight tolerance does not just cost more — it can add a finishing operation and stretch the schedule. Our tolerances are tied to process: ±0.003 mm for milling and turning, ±0.002 mm for grinding, verified on Hexagon CMMs with Cpk 1.851 demonstrated. Knowing what each process holds lets the planner route the part once, correctly.

Read the tolerance band before you read the index. Cpk is a ratio of the tolerance band to the process spread, not an absolute measure of accuracy. The figure above was recorded on a length characteristic with a 0.4 mm band (76.1–76.5 mm) — wide by design. Hold the same process spread against a ±0.005 mm feature and it fails outright. Ask for the band, the subgroup count and the sampling window on every capability number a supplier quotes.

Process	Held tolerance	Verification
Milling	±0.003 mm	Hexagon CMM
Turning	±0.003 mm	Hexagon CMM
Grinding	±0.002 mm	CMM plus surface finish

6. How does the manufacturer plan for volume?

Capacity planning is a two-way street. Tell us your annual volume and your ramp, and we reserve capacity so production lead times do not surprise you. Because the same equipment runs prototypes and production, the lead time you validate on a prototype is the lead time you can plan on in volume.

Volume planning works only when both sides commit. Before you share a forecast, confirm three points:

• Does the reserved capacity survive a spike in someone else's order? Ask how allocation is protected.
• Is the prototype process the same as the production process? If they differ, your validated lead time means little.
• Who confirms the ramp dates? Get a named planner, not a generic inbox.

7. What red flags signal a weak delivery promise?

8. Which part shapes route through the schedule fastest?

Shape decides the machine, and the machine decides the queue. A round part with a turned bore goes to a lathe and is often done in one setup; a prismatic bracket with milled faces goes to a 3-axis; a part with angled faces and cross-holes goes to a 5-axis or a mill-turn. The part that matches a standard machine routes faster than the part that needs a specialist.

The rule of thumb is simple: fewer setups means a shorter date. A round part that turns and mills in one chucking beats the same part bouncing between a lathe and a mill. When you look at a drawing, count the setups the shop will need, that count is a rough preview of the lead-time tier.

Part shape	Typical machine	Schedule profile
Round shafts, pins, bushings	CNC lathe	One setup, fast
Prismatic plates, brackets	3-axis mill	One or two setups
Cross-drilled round parts	Mill-turn	One setup for concentricity
Angled faces, compound angles	5-axis mill	Fewer setups than 3-axis

9. How does geometry decide the machine, and the date?

Geometry is the schedule's input signal. Internal corners, deep pockets, thin walls, and tight bores each push the part toward a different machine and a different cycle time. A sharp internal corner needs a small tool and a slow pass; a deep pocket needs a long-reach cutter that deflects; a tight bore needs a boring bar and a careful feed.

The shop reads the geometry and routes the part once, correctly. That is the difference between a part that ships on the first date and one that reworks its way to a second. When the geometry is friendly — relaxed radii, workable walls, standard threads — the route is short and the date holds.

If the geometry is hostile, the shop should tell you before quoting, not after the tool breaks. A DFM note that says "this corner cannot be cut as drawn" saves you a schedule slip; silence about it costs you one.

10. What do the material grades mean for a part's delivery?

Material is both a property and a schedule factor. The grade sets the cutting speed, and the cutting speed sets how long your part occupies a spindle. The same geometry in 6061 aluminum and in 316 stainless can land in different lead-time tiers, because one cuts in minutes and the other takes longer per part.

Grade	Typical part	Delivery note
6061-T6 aluminum	Housings, brackets	Fast; short tier
7075-T6 aluminum	Structural, aerospace	Slightly slower
303 / 304 stainless	Corrosion parts	Work-hardens; longer
316 stainless	Marine, chemical	Slowest of the common stainless
4140 alloy steel	Shafts, gears	Machines well annealed

Name the grade in your drawing, not just the family. "Aluminum" is a family; "6061-T6" is a spec. The grade is what lets the shop commit to a date instead of a guess.

11. How do you spec a part so it ships on time?

The drawing is the schedule's instruction set, and a well-specified part ships faster than a vague one. The three fields that move the date are the tolerance, the surface finish, and the secondary process. State them, and the shop can route and date the part in one pass.

• Tolerances only where function demands. Every over-tight callout adds a pass or an inspection.
• Surface finish as a number. Ra 1.6 µm means a specific process; "smooth" means nothing.
• Finishing and heat treatment named. If the part is anodized or hardened, say so at the start.
• A general tolerance standard. ISO 2768-m removes the ambiguity on undimensioned features.

A complete spec turns the quote into a routing. An incomplete one turns it into a question, and every question costs a day.

12. Which features add the most lead time to a part?

Some features are cheap to draw and expensive to schedule. Deep holes, sharp internal corners, thin walls, and fine threads each add time that has nothing to do with how big the part is. Knowing which ones cost you lets you design them out or plan for them.

Feature	Why it adds time	Fix
Sharp internal corners	Needs a small tool and slow pass	Add a radius; a standard end mill then works
Deep pockets / holes	Long-reach tools deflect and break	Shallow the pocket or open the corner
Thin walls	Chatter forces slower feeds	Thicken the wall or add a support rib
Non-standard threads	Special taps must be ordered	Use a standard size where possible

Every one of these is a decision you make in CAD that shows up later on the calendar. Design them out and the date shortens without the shop doing anything differently.

13. How does a part's tolerance split the schedule?

Tolerance splits a part between machines. A dimension at ±0.05 mm finishes on the mill or lathe in a normal pass; a dimension at ±0.003 mm may need a finishing pass; a dimension at ±0.002 mm needs the grinder. Each split adds an operation, and each operation adds a queue.

Tolerance band	Process	Schedule effect
±0.1 mm / ±0.05 mm	Standard milling or turning	No extra step
±0.003 mm	Milling or turning with a finishing pass	One extra pass
±0.002 mm	Precision grinding	Adds a dedicated step

The honest move is to tolerance only the dimensions that matter and leave the rest to a general class. A part with one ±0.002 mm bearing seat and everything else at ±0.1 mm routes far faster than a part where every dimension is tight for no reason. Put the tolerance where the function lives, and the schedule follows the part, not the print.

Frequently Asked Questions

How does the manufacturer's capacity set lead times?

The 100+ machines and the 3/7/30-day tiers are linked. Breadth of equipment means a job routes to the machine that cuts it fastest, and a 6,800 m² floor with 100+ employees runs prototype and production volumes without rescheduling the whole shop.

Which processes does the manufacturer run?

3-axis (50+), 4-axis (20+), and 5-axis (20+) milling, 25+ CNC lathes, mill-turn centers, and 7+ grinders. Mazak, Brother, Citizen, Star, and Tsugami machines cover the full metal-cutting range.

What tolerances can the manufacturer hold?

±0.003 mm for milling and turning, and ±0.002 mm for precision grinding. Critical dimensions are verified on Hexagon CMMs, with Ppk ≥ 1.67 at the initial study on key characteristics and ≥ 1.33 on general characteristics.

What is the minimum order quantity?

One piece. There is no forced production minimum, so you can machine a prototype, validate it, and scale into production on the same drawing and process.

Which materials does the manufacturer machine?

Aluminum, stainless steel, carbon and alloy steel, brass, copper, titanium, and magnesium, plus engineering plastics. Incoming bar is XRF-checked against the mill certificate before machining.

How do I get a quote with a delivery date?

Email your STEP, IGES, or 2D drawing to [email protected]. The reply includes a DFM review, an itemized quote, and a lead-time estimate tied to the part's actual process steps.

Which part features slow a schedule down the most?

Deep holes and pockets, sharp internal corners, thin walls, and non-standard threads. Each forces a slower feed, a special tool, or an extra setup. Relaxing a radius or opening a corner often pulls a part back into a faster tier without changing how it works.

Does the material grade change the delivery date?

Yes. The grade sets the cutting speed, so 6061-T6 aluminum routes faster than 316 stainless on the same geometry. Naming the exact grade in the drawing lets the shop commit to a date instead of guessing at a family.