Titanium CNC Machining Services

1. How Do You Choose Between Grade 2 and Grade 5?

Choose the grade based on the part’s load, environment and allowable deflection. Grade 5’s higher strength matters when strength limits the design; it does not automatically solve a stiffness problem. Grade 2 may be sufficient when corrosion resistance and ductility take priority. Check the material specification before making a substitution.

The grade comparison above covers typical uses and machining differences. The next step is to check what limits your design.

Compare the Design Requirements First

For a thin bracket, identify whether the limit is permanent deformation or movement under load. That distinction can lead to a different choice of grade, wall thickness or support. For an exposed component, consider the actual environment and contact materials rather than relying on a general corrosion-resistance claim.

The grade and delivery condition are separate requirements. “Commercially pure” and “Ti-6Al-4V” identify material type or composition; neither states the delivery condition. Put the required condition in the material specification, and resolve any disagreement between that specification and the drawing before ordering stock.

For engineering background, see Makino’s comparison of titanium varieties and our Grade 5 machining guide.

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2. Which Dimensions Need Tighter Control?

Apply tighter control to features that determine fit, alignment or function. Identify the datums and the relationships between those features, then give less demanding surfaces appropriate general tolerances. This lets the machining and inspection plan focus on what the assembly needs without treating every surface as equally critical.

Describe the Relationship, Not Just the Size

A bore diameter and its location relative to a mounting face answer different questions. If a shaft must align with another component, a size tolerance alone may not describe the requirement. Mark the functional datums, relevant geometric controls and mating features on the drawing so the quotation addresses the actual assembly.

Account for Flexible Features and Final Finishing

Thin walls, slender projections and deep pockets can be difficult to support while cutting or measuring. Identify where deflection would affect assembly, and discuss any temporary support or geometry changes before approving them. More material may help stability, but the design must still meet its weight and clearance requirements.

State which dimensions apply after finishing. A polished edge or treated mating surface may need different protection from a nonfunctional exterior. If a surface is inaccessible to the intended inspection method, identify that constraint early instead of assuming that any tolerance on the drawing is straightforward to verify.

For feasibility, refer to the precision statement and drawing-review conditions. A size tolerance, a positional requirement and a surface requirement must each be assessed in their own context.

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3. How Should You Specify the Finished Titanium Part?

Specify the finish by surface, required appearance and function. Identify any areas that must remain protected, and state whether dimensional acceptance applies after finishing. A process name alone does not define color, texture, roughness or edge condition, so include an appropriate reference or specification with the drawing.

Separate Appearance From Function

An anodized color is an appearance requirement; it does not by itself establish wear performance or suitability for a device. Include the intended purpose of the finish as well as the color reference. For background on the material itself, see titanium material properties.

For polishing, distinguish a visual reference from a measurable roughness requirement. Reflectivity alone does not specify the surface. Indicate whether sharp functional edges, sealing lands or mating diameters must be protected from material removal.

For bead blasting, identify the visible faces and the desired texture, together with bores, threads and other surfaces that need protection. Include relevant cleanliness or residue restrictions in the specification. A general matte appearance does not describe every requirement of a functional contact surface.

Review Combined Requirements Together

When a part needs both a controlled appearance and a close fit, show both on the same revision of the drawing. If more than one finish is requested, specify the intended finished result and sequence for review. For example, a polished sealing face and a matte exterior need separate surface callouts so one treatment does not compromise the other.

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4. What Should You Send for a Useful Titanium Machining Quote?

Send the current drawing and CAD model, titanium grade, quantity, finish requirements and required date. Identify the material condition, critical features and inspection needs. Consistent inputs help suppliers quote the same scope, expose feasibility questions early and make price and production-schedule comparisons more useful for the purchasing decision.

Make the RFQ Internally Consistent

Use a clear revision identifier for both the drawing and model. If they disagree, state which requirements govern and resolve the conflict before production. Keep optional design changes separate from the revision you want quoted.

Separate prototype quantity from the expected production quantity. Setup effort and repeat machining contribute differently to each quotation. If you are considering an alternative grade, finish or geometry, request it as a clearly identified option rather than mixing requirements from two designs.

Compare Scope Before Comparing Price

• Material: Is the same grade, required condition and purchasing specification included?
• Part definition: Does the quote refer to the same revision, quantity and final dimensions?
• Finish and acceptance: Are treated surfaces, inspection criteria and required records addressed?
• Schedule: Has the supplier evaluated the actual part and required date?

For planning ranges, see production lead times. The quoted schedule is the one to use for the order. Difficult access, thin features, finish requirements and inspection work can affect both cost and timing. The material grade alone is not enough to estimate those costs.

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