VMT provides custom Invar alloy CNC machining with 100+ CNC machines ±0.005 mm precision capability 12-step quality control CMM inspection DFM review and prototype-to-production support for Invar 36 parts.
Invar 36 Material Verification with Mill Test Reports
1-on-1 Engineering Support with 4-Hour DFM Analysis
One-Stop Support from Prototyping to Mass Production
40+ Surface Finishing Options with Fast Technical Response
Complete Inspection Equipment and Process Control for Zero-Defect Delivery
1 DayPrototyping Machining
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0 PcsMinimum Order Qualities
98%Yield
VMT machines custom Invar 36 / FeNi36 parts for optical, aerospace tooling, metrology, semiconductor, scientific and other temperature-sensitive precision assemblies.
Backed by 100+ CNC machines, 6 senior project engineers and 12-step quality control, we support material verification, DFM, 3/4/5-axis milling, turning, staged machining, CMM inspection and prototype-to-production manufacturing from your drawings.
Your requirement is not simply a machined Invar shape. You need critical geometry to remain within the drawing after unclamping, finishing, inspection and assembly. VMT focuses on the failure modes that create rework, scrap and delayed validation.
Base plates, optical seats and tooling datums must stay flat after unclamping, but residual stress and asymmetric stock removal can move the part; VMT uses staged roughing, balanced removal, datum re-checking and stress-relief evaluation before final machining.
Precision bores, mounting holes and functional datums must remain aligned, but repeated setups and datum transfer can accumulate position error; VMT uses datum-first planning, multi-axis machining, in-process verification and CMM inspection.
Thin walls must hold assembly gaps and mating geometry after pocket machining, but low stiffness, fixture pressure and uneven stock removal can cause spring-back; VMT reviews wall design, supports critical areas and stages machining with finishing allowance.
Functional faces need stable finish without tearing or smeared edges, but Invar's ductility and work hardening can create built-up edge; VMT uses sharp carbide tooling, controlled engagement, tool-life control and reliable coolant/chip evacuation.
Small holes, threads and edges must assemble without burr interference, but gummy chips can overload drills and taps or damage edge quality; VMT reviews tool access, chip evacuation, drilling/threading strategy and controlled deburring.
Approved prototype geometry must repeat in later lots, but fixture, tool-life, datum and inspection changes can shift the process; VMT retains validated programs, fixture records, first-article checks, IPQC and drawing-based final inspection.
Each stage produces a specific deliverable for your project—material evidence, DFM feedback, controlled machining, inspection data or a repeatable production route.
Check alloy specification, stock condition and incoming material before machining.
Review wall thickness, deep pockets, datums, tolerances, tool access and finishing allowance.
Plan locating surfaces, support points and clamping sequence around the functional datums.
Separate bulk stock removal from precision finishing when geometry or residual stress makes it necessary.
Use 3/4/5-axis milling, turning or combined operations according to the geometry.
Inspect critical features before the next operation when later cutting could affect geometry.
Verify drawing-defined dimensions, GD&T, bores, datums, threads and surface requirements.
Carry the validated machining sequence, fixture strategy and inspection plan into repeat orders.
VMT supports Invar projects for optics, laser systems, aerospace tooling, metrology, semiconductor equipment, scientific instruments and precision assemblies. Backed by 100+ CNC machines, 6 senior project engineers and experience producing 100,000+ custom machined parts across VMT programs, we support prototypes through repeat production while protecting confidential project details under NDA.
For lens, mirror and laser alignment structures requiring stable mounting datums, precision bores and controlled flatness across temperature-sensitive assemblies.
For metrology, positioning and scientific systems requiring large precision surfaces, hole patterns, datum control and repeatable mounting geometry.
For calibration and inspection systems requiring stable reference surfaces, locating holes and repeatable datum relationships.
For precision equipment frames, mounts and positioning parts combining cavities, critical interfaces and closely related multi-face features.
For composite lay-up tools, fixtures and reference structures where thermal stability and repeatable geometry matter during process temperature changes.
For laser housings, positioning structures and optical supports requiring controlled bores, mounting interfaces and alignment-related datums.
For instruments and precision assemblies combining thin walls, deep pockets, mounting features and multiple functional datums.
For precision assemblies requiring controlled diameters, concentricity, fits, threaded features and stable rotational relationships.
VMT turns DFM into measurable manufacturing decisions: what wall can be supported, which tolerances require special control, where finishing allowance is needed and how critical datums will be inspected.
Review unsupported walls, removal ratio, tool reach, fixture pressure and finishing stock.
Result: lower deformation risk before the design is locked.Identify flatness, position, parallelism, perpendicularity, concentricity and fits that control function.
Result: machining and inspection effort is focused where it adds value.Confirm Invar grade, stock form, condition and required traceability before release to production.
Result: material test / SGS reports can be provided as required.Align design, machining and inspection datums around the same functional geometry.
Result: fewer setup-transfer and assembly-alignment errors.Evaluate staged roughing, re-clamping, stress relief and final machining according to part risk.
Result: critical geometry is finished after major stress-release operations.Reserve critical dimensions for plating, grinding, lapping or other specified downstream processes.
Result: finished parts are inspected to final drawing requirements, not only pre-finish dimensions.Choose the alloy around the actual thermal requirement—not only the material name. VMT reviews the grade, operating environment, machinability and application before production, with material documentation available according to project requirements.
Best for low-expansion optical, metrology, tooling and precision structures. VMT reviews work hardening, residual stress, flatness and datum stability before machining.
Considered when improved machinability benefits complex or repeat-production parts. Any substitution should be confirmed against your thermal and material specification first.
Selected for specialized optical and measurement systems requiring even lower expansion near defined operating temperatures, with process planning matched to its more demanding machining behavior.
Choose Kovar when thermal-expansion matching with glass or ceramic is the primary requirement, rather than simply minimizing expansion of the metal component.
VMT combines 3/4/5-axis milling, CNC turning, mill-turn and Swiss machining so complex Invar features can be completed with fewer unnecessary setup transfers. Suitable critical features can be reviewed to ±0.005 mm, with process selection based on the datums, geometry and inspection requirements on your drawing.
For plates, frames, housings, pockets, tooling components, mounting surfaces and precision hole patterns.
For angled surfaces, compound geometry, difficult tool access and closely related multi-face features.
For shafts, rings, sleeves, bushings and cylindrical parts requiring controlled bores, diameters and fits.
For rotational parts combining diameters, flats, cross holes, slots and threaded features.
For small-diameter pins, shafts, sleeves and inserts when geometry and material specification make Swiss machining suitable.
This section shows what changes when the material is Invar rather than ordinary steel or aluminum. The goal is to keep the cutter cutting cleanly, keep heat and chips under control, and protect the geometry that would otherwise be lost to work hardening or unstable finishing.
VMT links inspection to the features that determine whether the Invar part will align, assemble and remain dimensionally stable. Material evidence, in-process checks, CMM verification and final reports can be planned before production.
| Inspection Item | VMT Control | Buyer Evidence |
|---|---|---|
| Material identity | IQC review of alloy specification and incoming material | Material test / SGS report available by project requirement |
| Critical dimensions | CMM, gauges and drawing-based measurement plan | Suitable critical features can be reviewed to ±0.005 mm |
| Flatness | Datum-based inspection with machining / lapping route as required | 0.003 mm achieved in VMT Invar optical-mount case |
| Hole position & datums | CMM verification against functional datum structure | ±0.005 mm hole position achieved in the same Invar case |
| Surface roughness | Surface-process planning plus roughness verification | Ra 0.4 μm achieved after precision lapping in the same case |
| Batch consistency | FAI, IPQC, FQC and OQC within a 12-step QC process | 100% inspection of drawing-defined critical dimensions available |
The customer's identity and protected drawing details are not disclosed. The case below uses manufacturing data VMT can publicly share from the project.
A precision laser-instrument manufacturer needed optical mounting seats that would hold lens alignment when ambient temperature changed. Dimensional drift in the existing structure could create micro-optic misalignment and beam distortion.
VMT recommended Invar 36 and used a multi-stage route: rough CNC milling → controlled stress-relief annealing at 330°C for 2 hours → semi-finishing → final machining. Sharp micrograin carbide tooling and high-pressure coolant were used for the demanding cutting operations.
Optical mounting datums were precision-lapped while non-functional external surfaces received #120 glass-bead blasting. Before shipment, 100% of parts received full dimensional and surface inspection with CMM verification.
The customer installed the parts in the test bed and performed thermal cycling from -20°C to 80°C. Beam drift remained virtually undetectable, supporting continued cooperation while the customer's project details remained confidential.
A prototype should do more than prove that the geometry can be machined. It can also validate fixture strategy, machining sequence, inspection methods and dimensional behavior before repeat production.
From optical mounts and aerospace tooling to defense and medical equipment, VMT machines Invar components for temperature-sensitive assemblies with DFM, multi-axis machining, staged stress control and CMM verification.
For optical and laser systems, VMT machines optical mounts, mirror supports, lens frames and laser bases that reduce thermal movement and help maintain alignment and beam positioning.
For aerospace and composite tooling, VMT machines lay-up molds, curing fixtures and reference tools that maintain critical geometry through temperature changes during composite manufacturing and validation.
For metrology and measurement equipment, VMT machines calibration fixtures, reference frames and inspection bases that preserve stable dimensional references and reduce temperature-related measurement error.
For semiconductor equipment, VMT machines precision frames, mounts, reference structures and positioning components that support repeatable alignment where small geometric shifts can affect equipment performance.
For scientific instruments, VMT machines sensor mounts, instrument frames, optical supports and precision bases that improve alignment stability and repeatable calibration in temperature-sensitive experiments.
For precision positioning and automation systems, VMT machines bases, alignment frames and reference fixtures that reduce thermally induced movement between mounting points and critical datums.
For aircraft and aviation equipment, VMT machines sensor supports, test fixtures, precision frames and low-expansion tooling that help maintain reference geometry across changing test environments.
For military and defense systems, VMT machines optical supports, sensor mounts, targeting frames and instrument components that help maintain alignment and dimensional repeatability across temperature changes.
For medical and diagnostic equipment, VMT machines imaging mounts, instrument frames and calibration fixtures that support stable alignment, repeatable measurement and controlled assembly interfaces.
VMT reviews surface requirements together with tolerance buildup, corrosion protection, optical appearance, assembly fits and final inspection. Two surface-finishing engineers and long-term finishing partners support projects that need controlled secondary processing.
Protect functional faces and internal features when the drawing can be met directly by CNC finishing.
Remove burrs from holes, slots, threads and edges without changing critical mating geometry.
Coordinate cleaning, masking and surface preparation before plating, coating, assembly or final inspection.
Provides uniform coverage on complex geometry and improves corrosion and wear resistance. VMT's Invar guide uses 5–15 μm per-side buildup as a common engineering reference.
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Used when the project requires additional corrosion protection or a specified plated interface. Critical fits and threads are reviewed for coating buildup before machining.
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Can be evaluated for conductive, oxidation-resistant or specialized interface requirements, typically with a suitable underlayer and masking plan defined by the drawing.
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Can be specified for selected wear surfaces when hardness and abrasion resistance are needed. Thickness, grinding allowance and final dimensions must be planned before coating.
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Thin functional coatings can be evaluated where wear, friction or surface durability matters, with substrate preparation and coating compatibility reviewed for the application.
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Improves selected cosmetic or functional surfaces while critical edges, datums and dimensions are protected against excessive material removal.
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Used for demanding flatness and surface requirements. VMT's Invar optical-mount case achieved 0.003 mm flatness and Ra 0.4 μm on precision-lapped datums.
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Creates a controlled matte surface on suitable non-functional areas. In the optical-mount case, #120 glass bead blasting was used to reduce visible tool marks and stray-light reflection.
Get a QuoteThese real customer emails reflect sample approval, part quality and confidence to move into repeat production. They are VMT customer reviews and are not presented as Invar-specific orders.
“We have now tested the samples and found out that their quality was very good. So, we would like to order a batch of 1000 pcs of each type for our production.”
“Your parts were perfect, thank-you. I want to order a production quantity soon.”
“The parts look great, wanted to provide you with that feedback.”
Answers focused on the questions engineers, quality teams and procurement buyers need resolved before releasing an Invar part for production.
A: Heavy or asymmetric material removal can release residual stress, while clamping can temporarily hold a part in a shape that changes after release. VMT reviews stock-removal balance, fixture pressure and datum strategy, then separates roughing from final machining where needed. Stress relief is evaluated for high-risk parts rather than automatically applied to every Invar component.
A: Suitable critical features can be evaluated to ±0.005 mm after drawing, geometry and measurement review. In a published VMT Invar 36 optical-mount case, hole position was controlled within ±0.005 mm and mounting-datum flatness reached 0.003 mm. Final capability still depends on feature size, datum scheme, wall thickness and inspection method.
A: VMT uses fixture-support planning, staged and balanced material removal, intermediate geometry checks and finishing stock around critical surfaces. When the drawing requires more than milling alone can reliably provide, precision grinding or lapping can be included in the route.
A: VMT's general CNC capability can review walls down to 0.5 mm for suitable geometry. For dimensionally sensitive Invar parts, however, the recommended wall may be thicker depending on span, unsupported height, material-removal ratio, clamping and flatness requirements. DFM review should confirm the wall before production.
A: Not every part does. VMT evaluates material condition, geometry, stock removal and final stability requirements. For the published optical-mount project, rough machining was followed by a controlled 330°C / 2-hour stress-relief cycle before semi-finishing and finishing because the dimensional requirement justified it.
A: Yes. Material identity and incoming material are reviewed before production, and material test / SGS reports can be provided according to the project's documentation requirements. Tell us any grade, heat/lot, traceability or certificate requirements when sending the RFQ.
A: Finishing allowance, coating buildup, masking and post-process inspection are defined before machining. Critical fits, threads, bores and datum surfaces can be reserved or protected so the final inspection checks the finished condition required by the drawing—not only the pre-finish dimensions.
A: Yes. VMT uses the prototype stage to validate fixtures, cutting sequence, critical dimensions and inspection methods. Approved programs, fixture strategy, first-article requirements and IPQC points can then be retained for repeat orders to reduce lot-to-lot variation.
A: Yes. NDA requirements can be arranged before detailed review. VMT's confidentiality process limits the internal use and public sharing of customer drawings, videos and project images, which is why some production cases are published without customer names or protected geometry.
Select a topic below to jump directly to the matching guide section. The first topic is visible by default, while other sections open only when selected or when you choose to view the full guide.
Invar 36, also known as FeNi36 or 4J36, is a nickel-iron controlled-expansion alloy used when dimensional change caused by temperature must be minimized. Common precision applications include optical supports, laser-system structures, metrology fixtures, aerospace tooling, scientific instruments and other assemblies where alignment or calibration depends on stable geometry.
Invar is not extremely hard, but its ductility, work-hardening behavior, gummy chips and low thermal conductivity can make it less forgiving than ordinary steel or aluminum. When the cutter rubs, the surface can harden; when chips are not evacuated, built-up edge can damage finish; and when heat or stock removal is poorly controlled, dimensional variation and tool wear increase. Stable engagement, sharp tooling and effective chip/coolant control are therefore central to process reliability.
DFM should review unsupported wall thickness, deep pockets, internal radii, tool access, small holes, threads and functional datums before production. VMT's general CNC capability can evaluate walls down to 0.5 mm for suitable geometry, but high-stability Invar structures may require thicker sections. The best design keeps critical datums accessible, avoids unnecessary deep narrow pockets and applies very tight tolerances only where they support actual function.
Tolerance capability depends on part size, wall thickness, material condition, feature type, datum relationships, setup count and measurement method. Suitable critical features can be reviewed to ±0.005 mm after engineering evaluation. If the functional requirement is flatness, position or another GD&T control, it should be specified directly rather than relying on a general ± dimension.
Distortion control starts before finishing. VMT reviews stock-removal balance, clamping pressure, fixture support and datum sequence, then uses staged roughing and intermediate checks where risk is high. Stress relief is added only when material condition and final stability justify it. In VMT's published optical-mount case, roughing was followed by 330°C / 2-hour stress relief before final machining, helping support 0.003 mm flatness.
Finishing should be defined before the machining allowance is finalized. Plating adds thickness; polishing, grinding and lapping remove material; blasting changes surface texture; and masking may be required around datums, threads or fits. For precision Invar parts, VMT coordinates the machining allowance and post-finish inspection so the final part—not only the pre-finish part—matches the drawing.
Cost is driven by raw material, material-removal volume, machining time, tool wear, setup count, tight tolerances, GD&T, thin walls, deep cavities, stress-relief steps, secondary finishing and inspection requirements. The best cost reductions usually come from DFM: reducing unnecessary setups, over-tight non-critical tolerances and deep features that require small, flexible tools.
Send the 2D drawing and 3D CAD model when available, together with Invar grade, quantity, critical tolerances, GD&T, surface finish, coating requirements, inspection requirements and relevant operating-temperature conditions. Identify which dimensions directly affect alignment, assembly or measurement so VMT can focus DFM and inspection planning on the requirements that matter most.
If your Invar component requires controlled flatness, precision datums, complex geometry or reliable dimensional repeatability, send VMT your drawing and application requirements for engineering review and quotation.
2024-08-02
The manufacturer is strongly recommended. In the past few years of cooperation we have ordered several machined products from aluminum and stainless steel. These products are manufactured in compliance with tolerance requirements and require product finish. Now I have ordered another one. The service is excellent and any questions can be answered and resolved in time.
2021-05-13
The dimensions are all customized according to my drawings no tolerance issues and the parts are delivered on time. I am very satisfied with it.
2021-04-06
I pay much attention to the surface treatment aspect of this product. I was a little worried about the cooperation at the beginning. I am very satisfied with the product now and hope to cooperate for a long time.
2022-09-22
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