CNC Machining Titanium Grade 2 From Drawing to Inspection

Prismatic And Complex Parts

3-axis milling suits plates, open pockets, and housing faces reachable from a small number of setups. Specify stock thickness, clamping exclusions, hole depths, and datum faces.

4/5-axis milling suits angled ports, multi-face housings, and complex mold or connector-tooling components. State inaccessible faces, required orientation, thin-wall limits, and any feature that cannot accept fixture contact.

Rotational And Mixed Geometry

CNC turning suits shafts, pins, bushings, and concentric bores when a stable chuck or collet datum is available. Define runout relative to the functional datum, bar or billet form, and unsupported length.

Mill-turn work suits rotational parts with flats, cross-holes, slots, or indexed patterns. For prototypes, disclose revision status; for repeat low-volume work, identify lot size, inspection frequency, and approved workholding assumptions.

Match Stock To Geometry

Plate suits prismatic parts; bar and rod suit turned or round profiles. Sheet reduces waste in thin flat parts, while tube preserves a bore and near-net blanks can reduce removal.

Control Material Direction

Rolled plate and sheet may have direction-sensitive properties, so identify the rolling direction when bending, fatigue loading, or distortion matters. A near-net blank needs sufficient machining allowance and datum stock before release.

Select The Grade

Grade 1 is generally more formable, Grade 3 stronger, and Grade 2 is the common middle choice among commercially pure grades. Grade 5 is a Ti-6Al-4V alloy; specify it only when its higher-strength trade-off is required.

Choose By Function

As-machined surfaces preserve dimensions and suit concealed features; bead blasting gives a uniform matte appearance but can alter fine edges. Polishing lowers visible texture but makes handling marks more apparent.

Vibratory tumbling deburrs accessible edges; it is unsuitable where media access, sharp geometry, or tightly controlled dimensions are concerns.

Specify And Verify

Anodizing, passivation, and qualified coatings require application-specific review of thickness, adhesion, masking, corrosion exposure, and mating behavior. General titanium finish options and trade-offs are summarized at https://hppi.com/knowledge-base/titanium.

SUUXIANG should confirm process suitability, masking, inspection method, and documentation against the drawing; this is not evidence that every finish is available.

Material And Drawing Control

Each lot should link the purchase record, material certificate, heat or lot identifier, and part traveler. Certificate review should confirm the specified Grade 2 standard, form, and required condition.

Three datum features should establish setup and inspection logic where the drawing permits. Tolerance stack-up must be evaluated from those datums, not from convenient machined edges.

Machining Stability Checks

Titanium retains heat near the cutting zone, accelerating wear and increasing galling risk; see https://hppi.com/knowledge-base/titanium. Tool-condition checks, controlled coolant delivery, rigid workholding, and stable tool engagement reduce variation.

Thin walls, deep pockets, and tight tolerances require early DFM review because deflection, chatter, and access limits can alter the finished geometry.

Release And Surface Evidence

First-article inspection should verify critical dimensions, datum relationships, threads, and specified surface requirements before production release. The agreed report format and sampling plan should be defined in the RFQ or purchase order.

Final checks should examine burrs, sharp edges, discoloration, chatter marks, and handling damage. Any nonconformance disposition needs revision-controlled customer approval.

Test The DFM Response

Three RFQ questions reveal engineering ownership: Which datums drive setup? How will thin walls be held, and which features need multi-axis access?

• Request annotated drawing feedback
• Ask for workholding concept
• Confirm tool-access limitations

Verify Material And Measurement

One material statement should identify mill source, Grade 2 designation, and traceable lot documentation. One inspection plan should link critical dimensions to datums, instruments, sampling, and report format.

• Ask for certificate availability
• Request measurement-method proposal
• Define first-article acceptance

Control Release And Delivery

Two written controls matter: revision acknowledgement before cutting and approved change authorization afterward. One realistic lead-time plan should separate material receipt, machining, inspection, approval, and protective packaging.

• Name the revision authority
• Set sample approval criteria
• Specify corrosion-safe packaging

Confirm Material Fitness

Grade 2 suits corrosion-focused applications, not every load-bearing design; an under-strength selection can cause in-service failure. State functional loads and require engineering confirmation of Grade 2 versus a higher-strength grade.

One purchase order must name the governing material standard, stock form, and required traceability. Otherwise, equivalent-looking bar, plate, or forged stock may create unexpected machining behavior.

Assign Tolerances By Function

Every noncritical tight tolerance raises machining and inspection effort without improving function. Mark CTQ dimensions, datums, and allowable limits; relax remaining dimensions before release.

Thin walls can deflect under cutting force and after unclamping. Specify minimum wall requirements and ask for a workholding and machining-sequence review.

Review Feature Access

Deep internal features, sharp internal corners, and restricted tool paths can force costly EDM or redesign. Provide section views and accept a documented tool-access, wire-path, or electrode strategy.

Each finish callout needs a measurable requirement and applicable surfaces. Define roughness, blast media, anodizing condition, masking, and cosmetic acceptance criteria.

Buy Verification, Not Assumptions

A low price without an inspection scope can exclude the measurements that protect fit and assembly. Attach the inspection plan, report format, sampling expectation, and traceability requirements to the PO.

A first article or prototype exposes tolerance-stack and mating risks before volume commitment. Validate it against the intended assembly, then formally release the controlled revision.

Define The Technical Package

1 drawing package should include the released 2D drawing, 3D model, revision level, quantity, and mating-part context for connector, tooling, or precision components.

3 feature groups should be flagged: critical dimensions, datum-dependent geometry, and surfaces affecting fit, sealing, electrical position, or motion.

Close DFM And Quality Planning

1 DFM review should confirm tool access, workholding, thin-wall risk, datum strategy, material form, finish, and any inspection method before quotation acceptance.

1 quotation review should align the process route, inspection plan, reporting requirement, sample quantity, and first-article acceptance criteria with the purchase order.

Control Release And Feedback

1 approved first article establishes the production baseline; record its drawing revision, measured results, approved deviations, and any handling notes.

2 revision controls matter after release: issue changes in writing and prevent superseded files from reaching the shop. Receiving inspection feedback should identify dimensional, finish, packaging, or traceability findings for the next lot.