A block quote is not a shop rate times hours. Machine class, fixture count, bore tolerance, and inspection depth set the price. Send a drawing and we return a 5-axis machining quote in 12 hours.
Most price surprises trace back to one of these. Ask about them before you compare numbers.
A block with canted deck faces and intersecting oil galleries cannot be finished in two setups on a 3-axis machine. The quote looks lower until the second and third fixtures appear, and each fixture adds hours plus a re-datum risk.
Main bearing bores are often called out as co-axial within a few microns. Without a stated roundness and straightness window, the shop guesses. Guessing low means you pay again at assembly when the crank does not turn freely.
CMM time on five mains, a deck flatness map, and a leak test can run longer than the finish cuts. A quote that omits metrology is not a cheaper quote, it is an incomplete one.
Iron and aluminum both relieve stress when you remove stock. If roughing and finishing happen in the same pass, bores can drift out of tolerance a day after shipment.
Machine class, fixture count, and in-process metrology decide most of the number.
On a simultaneous 5-axis center the block stays in one fixture while the spindle reaches the deck, both banks, the bellhousing face, and the main saddles. That removes the re-clamping error you get when a part moves between three or four operations.
We set the primary datum on the pan rail and the secondary on two dowel holes, then probe them at the start of every cycle. If the casting shifted in transit, the control picks it up before the first cut.
Compacted graphite iron sits between gray iron and ductile iron on strength and stiffness. Its graphite structure interrupts the cut, so it wears inserts faster than gray iron and demands more rigid toolholding. Boring bars need to be short and thick, and cutting data has to be dialed in per batch.
On a block in GGG-50 we plan for more insert changes and a slower roughing pass, then hold the finishing parameters steady for bore size and finish. Skimping on the roughing pass to save cycle time usually shows up later as taper in the main bores.
Machine class is the single largest line in a CNC engine block machine price quote.
| Block type | Machine class | Why |
|---|---|---|
| Inline 4, aluminum, prototype | 3-axis + 4-axis | Flat decks, open banks, low fixture count |
| V6 / V8, iron, small batch | Simultaneous 5-axis | Canted deck faces and intersecting bores in one setup |
| Block with integral oil galleries | 5-axis + mill-turn | Angled entries and cross-drilling need rotary access |
| Large industrial block, 4,000 mm class | 5-axis, 4,000 × 400 × 150 mm travel | Long castings exceed compact machine envelopes |
| Cylinder head deck repair | 3-axis with probing | Single face job, fixturing dominates the cost |
Each step is quoted separately so you can see where the hours go.
Deck, banks, bellhousing and main saddles in one setup on 16 simultaneous 5-axis centers. Best fit when datums and bore alignment matter together.
Main bearing bores and cam tunnels machined to size with roundness and straightness held for the honing operation that follows.
Head mating face cut flat and parallel to the crank centerline. Surface finish controlled for the gasket type you specify.
One-off or low-volume blocks, including pattern-stage revisions. No minimum order quantity, from a single part upward.
Oil galleries, dowel holes and threaded ports machined on 16 mill-turn centers with the block still on its primary datum.
CMM reports on bores, deck flatness and hole position. Raw material check, in-process monitoring and 100% final inspection.
Numbers we can hold on block work, not marketing ranges.
| Parameter | Value | Notes |
|---|---|---|
| Tolerance | ±0.005 mm (±0.0002 in) | On critical bores and datums |
| Fine finish | Ra 0.2–0.8 μm | Bearing bores and sealing faces |
| Standard finish | Ra 0.8–1.6 μm | General machined surfaces |
| As-machined finish | Ra 1.6–3.2 μm | Non-critical faces |
| Max processing size | 4,000 mm | Long castings and industrial blocks |
| Large travel | 4,000 × 400 × 150 mm | Long-axis work |
| Rotary table | Ø400 mm | Angled faces and cross-ports |
| Inspection | 100% before shipment | Reports on request |
Capability, not adjectives. Each item is something you can verify with us.
Three wholly-owned plants and 7,600 m² of floor space. The process knowledge behind the quote came from production parts, not a catalog.
Stated in millimeters and inches on the drawing review. If a feature cannot hold it, we say so before the job starts.
Enough capacity to run a block program without waiting for a machine window that fits a narrow envelope.
Quotation plus free DFM analysis within 12 hours of a usable drawing and 3D model.
Production can begin within 24 hours once the drawing and material are confirmed.
Backed by raw material checks, in-process monitoring and 100% inspection before shipment.
One-off blocks through small batches, with design changes folded in between runs.
Housing and block-type parts where bore alignment drives assembly fit.
Large castings up to 4,000 mm handled on long-travel 5-axis machines.
Workholding and check fixtures machined to the same datum scheme as the block.
Four things carry most of the cost: machine class, number of setups, material, and inspection depth. A 5-axis job with one fixture is usually cheaper than a 3-axis job with four fixtures, even at a higher hourly rate.
Material changes the cutting plan. GGG-50 wears inserts faster than gray iron, so roughing takes longer and tool changes are built into the cycle.
We machine from raw castings, billet, or a semi-finished block that already has locating features. Castings need enough stock on the critical faces and at least two usable dowel holes for the datum scheme.
If the casting has no locating features, we discuss adding them in a first operation before the main program runs.
We work to ±0.005 mm on critical bores and datums, with roundness and straightness held for the honing operation. Co-axiality across all mains depends on the fixture and on how much stress the casting releases during roughing.
When a bore callout is tighter than the process can hold reliably, we flag it during the free DFM review instead of quoting a number we cannot meet.
Yes. GGG-50 machines differently from gray iron. Its graphite structure interrupts the cut, so inserts wear faster and the boring bar has to be rigid and short.
We slow the roughing pass and plan insert changes into the cycle. Trying to save time in roughing usually shows up as taper in the finished bores.
There is no minimum order quantity. We run from a single prototype to 10,000+ part runs, and the setup cost is quoted openly so you can see what changes with volume.
For one-off blocks, the fixture and programming time dominate the price. That is normal and worth knowing before you compare quotes.
Uploads are secure and confidential, and we sign an NDA on request before any file exchange. Access to the model is limited to the programmers and machinists on the job.
We do not publish customer part drawings or reference your program in any public material.
Every part is inspected before shipment. Raw material is checked on receipt, dimensions are monitored in process, and the final inspection covers bores, deck flatness and hole position.
CMM reports are available on request. If you need specific features recorded, list them on the drawing so they are programmed into the inspection plan.
Quotation and free DFM analysis come back within 12 hours of a usable drawing. Production can start within 24 hours after confirmation.
Parts typically ship in 3–5 days. For a block with multiple operations and an inspection report, the schedule depends on the operation count, and we confirm it with the quote.
Upload the 3D model and drawing. We return a quotation and DFM notes within 12 hours, with the setup and inspection steps spelled out.
12-hour quote100% inspectionNo MOQNDA on request
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Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
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