Agriculture Precision CNC Machining Services

Farm machinery spends its life in conditions that break ordinary parts. Abrasive dust works into every clearance. Fertilizer and manure carry chlorides and ammonia that attack bare steel. Loads reverse thousands of times per season, and a seeder can sit in a barn for four months and then run twenty hours a day.

That combination changes what matters on a drawing. A gauge tolerance that looks fine on a bench may open up after a season of grit ingress. A surface finish that seals clean hydraulic fluid may weep once dust reaches the seal lip. Buyers who compare quotes on price alone usually pay for it later in field failures.

Machining decisions follow from this. We pick alloys for corrosion and wear first, then tighten tolerances only where the function needs them. A mounting boss does not need the same callout as a metering roller journal. Splitting the tolerance budget that way keeps cost down without giving up the fits that matter.

Most farm parts break into three groups, and each one points to a different machine. Metering discs, sprockets, flanges and bearing housings are largely turned or milled features that can be held on a three-axis mill or a lathe. Linkages, yokes and offset brackets usually need a fourth axis so the part can be indexed without re-fixturing.

Pump housings, impeller bodies, sprayer manifolds and complex valve blocks are the group that justifies five-axis work. A single setup reaches five faces, which removes the stacked error you get from moving a part between three operations. On a bore pattern with a true position callout, that difference shows up directly in the inspection report.

Turn-mill centers handle shaft-type parts that also carry cross holes, flats or milled slots. A metering shaft with a cross-drilled port is a typical example: one machine, one chucking, no re-datum. If your part has a long slender section, expect to discuss support and deflection before we quote.

We run 16 simultaneous five-axis machining centers, 12 four-axis mills, 27 three-axis machines and 16 mill-turn centers. Maximum processing size is 4,000 mm, with travels at 4,000 × 400 × 150 mm for long parts and 750 × 1,150 × 550 mm for wider work. A Ø400 mm rotary table covers most round parts that need indexing.

• 1
  Three-axis or latheTurned or single-face parts such as discs, sprockets and bearing housings.
• 2
  Four-axisLinkages, yokes and offset brackets that need indexing without re-fixturing.
• 3
  Five-axisPump housings, manifolds and valve blocks with bores on multiple faces.
• 4
  Mill-turnShafts with cross holes, flats or milled slots in one chucking.

Aluminium 6061-T6 is the default for housings, brackets and covers. It machines fast, holds ±0.005 mm on bores, and takes hardcoat anodizing for wear surfaces. It stops making sense where a part sees continuous abrasion or high point loads, because the oxide layer is thin and can chip under impact.

Stainless 316 and 316L handle fertilizer, slurry and washdown. 17-4PH gives you roughly triple the yield strength of 316 with better corrosion resistance than 4140, which is why it turns up on pump shafts and valve stems. 303 is easy to machine but weaker in chloride service, so we steer it toward internal parts that stay dry.

Steel 4140 and 4340 carry the load on tillage and linkage parts. Induction-hardened 1045 is a cheaper answer for shafts where the wear is on the outside diameter only. For abrasive soil contact, we sometimes suggest a magnesium or aluminium housing with a bolt-on hardened insert instead of one expensive alloy throughout.

Titanium and Inconel sit at the top of the cost curve. They earn their place on weight-critical or high-temperature parts, not on general farm hardware. If you are considering TC4 (Ti-6Al-4V) for a wear part, ask whether the wear surface can be coated instead. Plastics such as POM, PEEK and PA cover guides, bushings and low-load sensor bodies.

We hold ±0.005 mm (±0.0002 in) where the drawing calls for it. That is not the right target for every feature. On a bracket bolt hole, ±0.1 mm is plenty and costs less. On a metering roller journal or a hydraulic spool bore, the tight callout is what keeps the part working after a season.

Surface finish matters as much as size on sealing and sliding surfaces. Ra 0.2–0.8 μm is what we aim for on hydraulic seal faces. Ra 0.8–1.6 μm suits most bearing journals and rotating fits. Ra 1.6–3.2 μm is normal for general machined surfaces and is where most farm parts land.

Every part is inspected before it ships. That includes an incoming raw material check, in-process monitoring on critical features, and a final inspection against the drawing. Inspection reports are available on request, and we can supply first article reports for new programs.

A note on thread and bore fits. Stainless threads gall more than steel, so specify a slightly looser class or a plated finish if the joint will be assembled and taken apart in the field. Blind holes that trap moisture are worth calling out early; a small drain feature often costs less than a corrosion failure.