Achieving ±0.002mm Tolerances: What It Really Takes in a CNC Shop

±0.002 mm. Two microns. One-fiftieth the diameter of a human hair. In CNC machining, this number separates shops that can ship tight-tolerance parts with confidence from those that burn hours chasing dimensional drift they cannot explain.

Most CNC shops will tell you they can hold ±0.01 mm. A fraction will say ±0.005 mm. But ±0.002 mm—and doing it repeatedly, across production batches, with documented proof—requires something fundamentally different. It requires transforming the entire machining environment into a measurement system where every variable is controlled, monitored, and compensated for.

At Baosheng Industry, we machine parts to these tolerances for aerospace, medical device, and semiconductor customers who stake their product performance on our dimensional accuracy. A satellite component that drifts 0.003 mm in orbit can fail. A medical implant that deviates 0.005 mm from its designed geometry can cause tissue damage. A semiconductor wafer guide that warps a few microns can scrap an entire batch of chips.

In this guide, we’ll walk through what it actually takes to achieve and verify ±0.002 mm tolerances in a production CNC environment—not in theory, but on a shop floor running real parts for real customers. If you’re an engineer designing parts at this tolerance level, or a procurement manager evaluating whether a supplier can actually deliver what their website claims, this is for you.

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1. Thermal Management: The Foundation That Everything Else Depends On

Most engineers understand that metal expands when heated. Fewer appreciate just how dramatically temperature affects dimensional accuracy at the micron level.

A 300 mm steel fixture will shift approximately 3.5 µm for every 1°C change in temperature. A 1-meter aluminum part will expand or contract 0.012 mm with a 1°C temperature change—six times the tolerance band we’re trying to hold. If your shop temperature varies 5°C between morning and afternoon, any measurement taken in the morning will be invalid by afternoon—not because anything changed in the part, but because the part itself changed size.

This is why thermal management is not an optional upgrade for ±0.002 mm work. It is the foundation upon which every other precision capability is built.

Temperature Control: What the Numbers Demand

Research on micron-level CNC repeatability is unequivocal: if your shop temperature varies more than ±2°C through the day, thermal effects will dominate your repeatability error. Investing in climate control for the machine area is often cheaper than chasing tolerance with better tooling.

For ±0.002 mm work, the requirements escalate:

These are not aspirational targets. They are the operational requirements that precision manufacturing facilities implement to make ±0.002 mm a production reality rather than a theoretical capability.

Precision machining facilities achieve this through dedicated climate control systems that maintain ambient conditions within ±1°C, preventing thermal expansion effects that could alter part dimensions. The most advanced implementations control not just room air temperature but also coolant temperature—since cutting fluid acts as a direct thermal conductor between the tool, workpiece, and machine structure.

The Machine Warm-Up Protocol

For any high-tolerance job, the machine must be thermally stable before the first workpiece is loaded. This means running a “warm-up” program—typically 30 minutes—that exercises all axes through their full travel with no load, bringing the entire machine structure to a consistent operational temperature.

The spindle, ball screws, linear guides, and machine casting all expand at different rates as they warm up. A spindle that has been running for 15 minutes is a different length than one that has been running for 2 hours. The warm-up cycle eliminates this variable by ensuring every job starts from the same thermal state.

Coolant as a Thermal Control Medium

Coolant is not just for chip evacuation and lubrication. In precision machining, it is a thermal control medium. Cutting zone temperatures can spike hundreds of degrees at the tool-workpiece interface, and that heat conducts into the part, causing localized thermal expansion that distorts the very feature being machined.

For ±0.002 mm work, coolant temperature is controlled to ±0.5°C of setpoint. This is achieved through chiller units integrated into the machine’s coolant system, which actively heat or cool the fluid to maintain a constant temperature regardless of ambient conditions or cutting heat input.

Without this level of control, a part that measures within tolerance immediately after machining may be out of tolerance 30 minutes later—after it has cooled to room temperature and “relaxed” to its true dimensions.

Explore how our factory’s thermal management supports ±0.002 mm repeatability →

2. The Machine: Beyond the Spec Sheet

A machine tool’s published positioning accuracy is not the tolerance it can hold on your part. The difference between the two is determined by everything that happens between the machine’s linear scale and your workpiece: the spindle, the tool holder, the cutting tool, the fixture, and the part itself.

What the Machine Must Deliver

For ±0.002 mm work, the machine tool foundation must provide:

• Volumetric positioning accuracy significantly better than the target tolerance. As a rule, the machine’s stated positioning accuracy should be at least 4× better than the tolerance you intend to hold—because all other error sources (tool deflection, thermal drift, fixture error, measurement uncertainty) add to the machine’s baseline error.
• Glass scale feedback on all linear axes. Rotary encoders on ballscrews have backlash and thermal expansion errors that compound over travel distance. Glass scales mounted directly to the machine structure measure actual axis position, eliminating these error sources.
• Temperature-stabilized core components. Spindle chillers, ballscrew core cooling, and temperature sensors distributed throughout the machine structure feed real-time compensation algorithms that adjust for thermal growth during operation.
• Geometric accuracy maintained through regular calibration. Ballbar testing, laser interferometry, and grid encoder calibration verify that the machine moves precisely where commanded, with any deviations mapped and compensated.

The Cost of Skipping Calibration

Machine tools drift over time. Ballscrews wear. Linear guides develop play. Spindle bearings degrade. Without regular geometric calibration, a machine that was capable of ±0.002 mm when commissioned may drift to ±0.008 mm or worse within a year.

For tight tolerance control, CNC machines should typically undergo geometric accuracy verification every 6–12 months, depending on usage intensity. This includes laser interferometer verification of linear positioning, ballbar testing for circularity and servo mismatch, and squareness verification between axes.

The Real-World Example: Thermal Equilibrium in Production

One precision machining provider documented a case where a 50-part pilot run of aluminum 7075-T651 aerospace actuator housings showed a consistent drift of nearly 0.003″ (0.076 mm) on Z-axis dimensions by the tenth part. The initial prototypes, machined in a climate-controlled lab, had passed inspection. But in production, the cumulative heat generated by back-to-back machining cycles had soaked into the machine structure, the vise, and the parts themselves.

The solution required a complete re-engineering of the thermal management approach: spindle and ball screw cooling systems fine-tuned beyond factory defaults, a mandatory 30-minute machine warm-up cycle before any high-tolerance work, and strategic scheduling to allow thermal stabilization between roughing and finishing operations.

This case illustrates a critical truth: a machine that can hold ±0.002 mm on a one-off prototype may not be able to hold it on the fiftieth production part unless thermal management and process discipline are designed into the entire production sequence.

Learn about our 5-axis CNC capabilities for complex tight-tolerance parts →

3. The Measurement Chain: You Can’t Make What You Can’t Measure

The most overlooked requirement for ±0.002 mm work is also the most fundamental: you cannot consistently produce a tolerance you cannot consistently measure. And measuring at this level requires its own controlled environment, calibrated equipment, and rigorous methodology.

The Metrology Hierarchy

In precision manufacturing, measurement capability follows a hierarchy:

For ±0.002 mm work, the measurement chain must be at least one order of magnitude more precise than the tolerance being verified. A CMM with ±0.0015 mm stated accuracy cannot reliably verify a ±0.002 mm tolerance—the measurement uncertainty consumes too much of the tolerance band.

The Golden Rule of Measurement

Industry metrology standards specify that the measurement system’s uncertainty should not exceed 10% of the total tolerance band. For a ±0.002 mm tolerance (total band 0.004 mm), this means the measurement system needs an uncertainty of 0.0004 mm or better.

This 10:1 rule, formalized in ISO 14253-1 and other metrology standards, is not a guideline—it is a requirement for reliable conformity assessment. When the measurement uncertainty-to-tolerance ratio exceeds 10%, the risk of accepting out-of-tolerance parts (consumer’s risk) or rejecting in-tolerance parts (producer’s risk) increases significantly.

This is why precision manufacturing facilities invest in dedicated measurement laboratories with temperature control of 20 ± 0.2°C—tighter than the shop floor itself. The measurement environment must be more controlled than the manufacturing environment, because measurement errors at the micron level compound with manufacturing errors and can push a borderline part from “acceptable” to “rejected” based on measurement conditions rather than actual geometry.

Coordinate Measuring Machines (CMM): The Final Arbitrator

For ±0.002 mm verification, the CMM is not optional—it is essential. Modern CMMs achieve measurement accuracy of ±(0.5 + L/1000) µm, where L is the measured length in millimeters. For a 100 mm feature, this translates to measurement uncertainty of ±0.6 µm—within the acceptable range for verifying ±0.002 mm tolerances.

But the CMM itself must be operated in a temperature-controlled environment. Temperature fluctuations are one of the most common causes of measurement errors on parts with tight tolerances. As production tolerances become ever tighter and the error margin for measurement results constantly shrinks, temperature control at the inspection stage becomes as critical as temperature control during machining.

Parts must also be thermally stabilized before measurement. A part that comes directly from the machine—still warm from cutting—will measure differently than the same part after it has reached thermal equilibrium with the measurement room. For ±0.002 mm work, parts are typically stabilized in the measurement lab for a minimum of 4 hours before CMM inspection, and often 24 hours for critical aerospace or medical components where the tolerance band is fully consumed by the design requirements.

In-Process Probing: Measuring Where It Matters

While the CMM is the final arbitrator, in-process probing on the machine tool provides the real-time feedback that keeps the process stable between final inspections.

Modern strain-gauge machine tool probes, such as the Renishaw RMP600, achieve repeatability of 0.25 µm (0.00001″) and deliver high accuracy when triggered from any direction. When combined with on-machine verification software that uses CMM-type algorithms, these probes give the CNC machine CMM-like capability—allowing critical features to be measured while the part is still fixtured.

This capability is transformative for ±0.002 mm work. Instead of machining a feature, removing the part, transporting it to the CMM, discovering a 0.003 mm deviation, re-fixturing, re-indicating, and re-machining, the in-process probe catches the deviation immediately. The CNC program can automatically update tool offsets based on the probe data, compensating for tool wear, thermal drift, or fixture variation before they produce an out-of-tolerance condition.

The economic impact is substantial. Aerospace manufacturers have documented that in-process probing eliminates many hours of production delays and prevents accuracy problems that arise when moving and re-fixturing high-value parts. When you’re machining a $5,000 titanium forging that has already accumulated 20 hours of machining time, the ability to verify a critical bore while it’s still on the machine—and correct it immediately if needed—is the difference between a profitable job and a scrapped part.

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4. The Tooling Chain: From Spindle to Cutting Edge

The machine may position to ±0.001 mm, but if the tool holder has 0.005 mm of runout, the cutting edge will orbit in a circle 0.010 mm in diameter—five times the tolerance band. The tooling chain from spindle taper to cutting edge is a series of interfaces, each introducing potential error.

Tool Holder Selection

For ±0.002 mm work, the tool holder is not an accessory. It is a precision instrument that determines whether the cutting edge cuts where it’s supposed to cut.

For precision work, the synergy between the cutting tool and the tool holder is critical. A premium sub-micro-grain carbide tool with a specific coating, defined helix angle, and guaranteed runout of less than 0.005 mm, paired with a high-precision, thermally stable hydraulic or shrink-fit holder, creates a system whose total runout is controlled rather than assumed.

Cutting Tool Strategy

At ±0.002 mm, tool wear is no longer a gradual degradation—it is an active variable that must be monitored and compensated for in real time.

• Finishing tools are dedicated and segregated. A tool that has roughed 50 parts may have 0.005 mm of edge wear—invisible to the naked eye but more than double the tolerance band. Finishing tools are used only for finishing, on a known number of parts, and replaced before the wear band exceeds the allowable threshold.
• Coatings are selected for thermal stability. For aluminum, AlTiN or uncoated polished carbide reduces built-up edge and friction heating. For stainless and titanium, AlCrN provides hot hardness and oxidation resistance at the elevated temperatures generated in the shear zone.
• Tool geometry minimizes cutting forces. High-positive rake angles, sharp edges, and optimized helix angles reduce cutting force magnitude—which reduces tool deflection, which reduces dimensional error. For finishing passes, chip thickness must stay above the minimum threshold to prevent rubbing (which work-hardens the surface and causes built-up edge) but below the level that generates excessive force.

Tool Life Management: Predict Before You Scrap

Tight tolerance shops run finishing tools to a conservative percentage of their theoretical life. When the tool reaches the predetermined limit, it is replaced—regardless of whether it “still looks sharp.” The cost of a replacement end mill is negligible compared to the cost of a scrapped part that has accumulated hours of machining time.

Advanced tool monitoring systems can detect subtle changes in cutting forces and adjust parameters accordingly. Implementing tool life management programs helps predict and prevent tolerance deviations caused by worn tools. For ±0.002 mm work, this is not optional—it is the mechanism that prevents tool wear from silently consuming the tolerance band.

See our approach to tooling and process control for precision CNC machining →

5. Workholding: The Interface Where Microns Are Won or Lost

Workholding repeatability at the micron level demands that the datum interface—where the fixture meets the machine table—returns to the same position within the tolerance band across every part change, every shift, and every production run.

Achieving ±0.002 mm repeatability is a system-level outcome: the interface geometry, surface condition, thermal state, clamping force, and verification method all contribute. Get any one of these wrong, and your system drifts to ±0.01 mm or worse.

Datum Interface Design

The foundation of workholding precision is the datum interface. Flat-on-flat datum interfaces rely on friction and edge contact. Over thousands of cycles, micro-wear and chip contamination cause “float”—the fixture shifts slightly each time it is re-seated. Taper-type positioning solves this by guiding the pull stud into a conical seat that self-centers as clamping force is applied, eliminating micro-gaps and providing a natural, repeatable locating mechanism.

Clamping Force: The Goldilocks Zone

Clamping force for ±0.002 mm work must be sufficient to resist cutting loads but controlled to avoid part distortion. Too little force, and the part shifts during cutting. Too much force, and the part elastically deforms in the fixture—machined to dimension while distorted, then springs back to a different shape when released.

This is particularly critical for thin-wall parts, where even moderate clamping pressure can distort the workpiece by several microns. Precision shops use torque-limiting wrenches, hydraulic clamping with regulated pressure, or vacuum fixturing to apply consistent, controlled force.

Verification Protocol

For ±0.002 mm work, you verify—you don’t assume. The standard protocol involves running a 20-cycle seat/unseat test with a dial test indicator or touch probe before production begins. The fixture is mounted, indicated, removed, and re-mounted 20 times. The total range of measured positions across all cycles must stay within the tolerance band. If it doesn’t, the source of variation must be identified and eliminated before production starts.

Learn how our DFM review identifies workholding strategies for your tight-tolerance parts →

6. Process Discipline: The Checklist That Makes It Repeatable

All the climate control, precision machines, and CMM capability in the world won’t produce ±0.002 mm parts consistently without process discipline. This is the layer that separates shops that can occasionally hit tight tolerances from those that deliver them predictably.

The Pre-Production Protocol

Before the first part is loaded for a ±0.002 mm job, the following must be confirmed:

Machine readiness:

• Machine warm-up cycle completed (minimum 30 minutes, all axes exercised)
• Shop floor temperature stable at 20 ± 0.5°C for preceding 2 hours
• Coolant temperature verified at setpoint ±0.5°C
• Spindle and axis thermal compensation active and verified

Tooling readiness:

• Finishing tools are new or have documented remaining life
• Tool holder runout verified at ≤0.003 mm
• Tool length and diameter offsets set on-machine with automated tool setter
• All tools for this job are dedicated (not shared with other jobs)

Workholding readiness:

• Fixture datum surfaces clean and undamaged
• Clamping force verified (torque wrench or regulated pressure)
• Part seated and indicated; runout within 0.002 mm
• First-article probe cycle programmed and verified

Metrology readiness:

• CMM calibrated within specified interval
• Measurement lab temperature stable at 20 ± 0.2°C
• Inspection plan loaded and verified against drawing

The In-Process Control Cycle

During production, the following are monitored continuously:

• Part sampling: First article: 100% dimensional inspection. Subsequent parts: sampling frequency based on process capability (Cpk). If Cpk for a given feature is above 1.67, sampling can be reduced. If it drops below 1.33, sampling increases to 100% until root cause is identified and corrected.
• Tool wear monitoring: Finishing tools are replaced at predetermined intervals based on documented tool life. Interim tool condition is checked via in-process probing of critical features. If probe data shows a trend toward the tolerance limit (even if still within spec), the tool is replaced proactively.
• Thermal monitoring: Machine temperature sensors and shop floor thermometers are monitored continuously. Any temperature excursion outside ±0.5°C triggers a hold on production until the environment stabilizes.
• SPC tracking: Key characteristics are tracked on statistical process control charts. Trends that approach control limits trigger investigation and corrective action before out-of-tolerance conditions occur.

The Post-Process Verification

After machining:

• Parts are cleaned and thermally stabilized in the measurement lab for a minimum of 4 hours (24 hours for critical aerospace or medical components).
• CMM inspection is performed per the approved inspection plan.
• Inspection data is recorded and archived for traceability. For regulated industries, this data is maintained for the required retention period.
• First Article Inspection (FAI) reports per AS9102 or equivalent are generated for new parts or process changes.

Quality Systems: ISO 9001 and Beyond

A robust quality management system is not merely about having a certificate—it is about having documented, auditable processes that ensure consistency. ISO 9001:2015–aligned quality processes provide the framework for systematic quality control: documented process control from raw material verification through in-process inspection and final dimensional checks using calibrated inspection equipment.

The most rigorous implementations include C=0 acceptance sampling, SPC-driven in-process checks, NIST-traceable metrology, first-article/ISIR verification, and optional PPAP evidence—with documented final inspection and 100% high-speed verification capability for critical features.

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7. What This Means for Your Part

The practical implications for engineers and procurement managers are straightforward:

Design Considerations for ±0.002 mm Tolerances

Specify tight tolerances only where functionally necessary. Every ±0.002 mm callout adds cost—not because the machine time is dramatically higher, but because the process control infrastructure required to hold it (thermal stabilization, in-process probing, CMM verification, documentation) must be activated for that feature.

Consider material selection in the context of thermal behavior. Aluminum 6061-T6 has nearly twice the coefficient of thermal expansion of steel. A 100 mm aluminum part will change dimension by approximately 0.0024 mm per 1°C. If your shop environment varies by even 2°C through the day, that’s the entire tolerance band consumed by thermal expansion alone—before a single cut is made.

Design for probing access. If you specify a ±0.002 mm tolerance on an internal feature that a CMM probe cannot reach, you’ve specified an uninspectable requirement. Always verify that critical tolerances are on features accessible to the available measurement equipment.

Understand that not every feature on the part needs ±0.002 mm. A bracket may have one bearing bore that requires micron-level precision, while the mounting holes can be ±0.1 mm. Call out the tight tolerances explicitly, and leave the rest at standard machining tolerances. This allows the shop to focus process control resources on the features that matter.

Evaluating Suppliers

When evaluating whether a CNC shop can actually deliver ±0.002 mm tolerances:

• Ask to see their CMM inspection reports for similar-tolerance work. A shop that can hold ±0.002 mm will have the data to prove it.
• Ask about their temperature control: what is the shop floor temperature range? Is there a separate, temperature-controlled measurement lab? What is the coolant temperature control specification?
• Ask about their in-process probing capability. Do they measure on the machine, or only after the part comes off? On-machine probing is not required for ±0.002 mm, but its presence indicates a systematic approach to process control.
• Ask about their quality certifications. ISO 9001:2015 is the baseline. AS9100D and ISO 13485 add aerospace and medical device–specific requirements including enhanced traceability, risk management, and process validation.

The Cost Reality

Holding ±0.002 mm costs more than holding ±0.01 mm. The premium comes from:

• Climate-controlled manufacturing and measurement environments.
• Precision tool holders and dedicated finishing tooling.
• In-process probing and CMM inspection.
• Slower machining speeds and lighter cuts to control thermal input.
• Higher scrap rates on complex geometries during process development.
• Documentation and traceability requirements.

This premium is justified when the tolerance is functionally necessary—when a bearing fit, seal surface, or alignment feature will fail if it deviates beyond the specified band. It is not justified when a ±0.05 mm tolerance would serve the same function. Understanding this distinction is the difference between a cost-optimized design and one that pays for precision it doesn’t need.

Get a free DFM review to assess whether your tolerances are achievable and cost-optimized →

How Baosheng Achieves ±0.002 mm Tolerances

At Baosheng Industry, we don’t just claim ±0.002 mm capability. We’ve built the infrastructure to deliver it:

• 20 years of precision machining experience serving aerospace, medical device, automotive, and semiconductor customers who demand documented dimensional accuracy.
• 582 CNC machines, including 5-axis mills with simultaneous capability, housed in temperature-controlled production areas.
• AS9100D, ISO 13485, IATF 16949, and ISO 9001:2015 certifications held directly by our facility—not through partners or subcontractors.
• In-process probing with strain-gauge technology for real-time tool offset compensation and feature verification while parts remain fixtured.
• Dedicated CMM inspection laboratory with temperature control for final dimensional verification. Full documentation packages including material certifications, in-process inspection data, CMM reports, and certificates of conformance.
• Free manual DFM review with every quote, including specific tolerance feasibility assessment, thermal management considerations, and cost optimization recommendations.

We invite customer audits of our facility. Walk our shop floor. See the temperature controls. Review our CMM reports. Because when you’re trusting a supplier with ±0.002 mm tolerances, you should be able to verify the capability with your own eyes.

Free DFM Analysis • ±0.002 mm Certified Capability • AS9100D / ISO 13485 / IATF 16949 • CMM Inspection Reports • Open to Factory Audits • 24-Hour Engineer Response

Frequently Asked Questions (FAQ)

Q1: What’s the difference between ±0.01 mm and ±0.002 mm tolerance in CNC machining?

Answer: ±0.01 mm is achievable on most modern CNC machines with standard tooling and reasonable process control. ±0.002 mm requires a fundamentally different approach: temperature-controlled shop floor (20 ± 0.5°C), dedicated finishing tooling with verified runout under 0.003 mm, in-process probing for real-time compensation, CMM verification in a separate temperature-controlled lab, and rigorous process discipline including machine warm-up cycles, tool life management, and thermal stabilization of parts before inspection.

Q2: Why does temperature matter so much for ±0.002 mm tolerances?

Answer: Metal expands approximately 0.012 mm per meter per 1°C temperature change. A 300 mm steel fixture shifts about 3.5 µm per 1°C. If your shop temperature varies 5°C between morning and afternoon, a part that measures within tolerance in the morning may be 0.0175 mm out of tolerance by afternoon—over 8 times the allowed tolerance band. This is why temperature control is the foundation of all precision machining capability.

Q3: Can any CNC machine hold ±0.002 mm?

Answer: No. The machine must have glass scale feedback on all axes, temperature-stabilized core components, and geometric accuracy verified through regular laser interferometer calibration and ballbar testing. Even with the right machine, holding ±0.002 mm requires climate control, precision tool holders (hydraulic or shrink-fit), in-process probing, and rigorous process discipline. The machine is necessary but not sufficient.

Q4: How do you verify ±0.002 mm tolerances?

Answer: Through a metrology chain: in-process probing on the machine provides real-time feedback and tool offset compensation; CMM (Coordinate Measuring Machine) inspection in a temperature-controlled measurement lab (20 ± 0.2°C) provides final dimensional verification. The measurement system must follow the 10:1 rule—the measurement uncertainty should be no more than 10% of the tolerance band. For ±0.002 mm, this requires measurement capability in the sub-micron range.

Q5: Does every feature on my part need a ±0.002 mm tolerance?

Answer: Almost certainly not. Specify tight tolerances only where functionally necessary—bearing bores, seal surfaces, alignment features, press-fit interfaces. Every unnecessary tight tolerance adds cost without adding value. A bracket with one bearing bore at ±0.002 mm and mounting holes at ±0.1 mm is far more cost-effective than one where every feature is called out at the tightest tolerance.

Q6: What certifications should I look for in a ±0.002 mm CNC supplier?

Answer: ISO 9001:2015 is the baseline for quality management. AS9100D adds aerospace-specific requirements including enhanced traceability, risk management, and configuration control. ISO 13485 covers medical device quality management. IATF 16949 is specific to automotive. The certification should be held directly by the manufacturing facility—not through partners or subcontractors—to ensure continuous QMS coverage.

Q7: What materials are most challenging for ±0.002 mm tolerances?

Answer: Materials with high coefficients of thermal expansion (aluminum, copper alloys) are challenging because thermal effects dominate dimensional variation. High-strength alloys (titanium, Inconel) are challenging because they generate significant cutting heat and cause rapid tool wear. Plastics like PEEK and PEKK are challenging because they are hygroscopic and have large thermal expansion coefficients. For all these materials, thermal management and process control become even more critical.

Q8: How does Baosheng’s approach to tight tolerances differ from standard CNC shops?

Answer: We’ve built the infrastructure specifically for precision work: temperature-controlled production environment, in-process probing on our machines, a dedicated CMM inspection laboratory with separate temperature control, documented process control procedures, and AS9100D/ISO 13485/IATF 16949 certifications held directly. Every tight-tolerance quote includes a manual DFM review by an engineer who assesses whether the specified tolerances are achievable and cost-optimized for your part geometry and material.