ISO 9001:2015 · LIGHT-BAND FLATNESS · IL / WI / IN

Precision
Surface
Lapping.

Chicago Lapping Co coordinates contract precision lapping for aerospace, semiconductor, and medical programs across Illinois, Wisconsin, and Indiana. Single- and double-sided work, flat finishing, mechanical-seal and wafer surfaces — held to light-band flatness on production volumes.

< 1/10 λ Light Band Flatness
0.005 µin Surface Roughness (Ra)
0.00005" Parallelism Tolerance
Capabilities 8 LAPPING PROCESSES
Max Part Dia. Ø 60.00 IN
Inspection LASER INTERFEROMETRY
Status CAPACITY AVAILABLE
Process Engineering

Core Capabilities

Every lapping process below is available across Illinois, Wisconsin & Indiana, performed under documented process controls aligned with ISO 9001:2015. Submit one request and receive a direct quote covering process selection, tolerances, and lead time within one business day.

Single and Double-Sided Lapping reference

Single and Double-Sided Lapping

Both faces finished in one setup. Parallelism and flatness held together for seals, plates, and high-volume blanks.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
Flat lapping reference

Flat lapping

Planar finishing for reference faces, tooling, and inspection surfaces where flatness drives the whole measurement chain.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
Spherical/Ball Lapping reference

Spherical/Ball Lapping

Controlled spherical and ball geometry finishing for valves, bearings, and precision mating surfaces.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
Hand lapping reference

Hand lapping

Manual finishing for prototypes, selective fits, and geometry that machine cycles cannot reach cleanly.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
Machine lapping reference

Machine lapping

Repeatable machine cycles for production lots with documented flatness and surface-finish targets.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
Mechanical Seal/Silicon Wafer Lapping reference

Mechanical Seal/Silicon Wafer Lapping

Seal faces and wafer blanks finished for contact integrity, low Ra, and lot-consistent geometry.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
Production lapping reference

Production lapping

Scheduled lot work with process controls, inspection sampling, and per-lot certification packages.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
Taper, Shoulder, and Counter Bore Lapping reference

Taper, Shoulder, and Counter Bore Lapping

Targeted finishing on shoulders, tapers, and counterbores where form error shows up as assembly failure.

Tolerance: Light-band flatness Inspection: Interferometry
View capability
All 8 lapping processes · Per-lot certification · Light-band flatness Request a quote. Receive a direct response in one business day.
Service Sequence

From Quote to Certificate

A clear path for plant engineers and quality managers — no multi-step wizard, no ambiguity on what ships back.

01 · Submit

Request a Quote

Share drawings, material, target flatness / Ra, and lot size. Response within one business day.

02 · Schedule

Confirm Process Path

Process selection, achievable tolerances, and lead time are confirmed before parts move.

03 · Finish

Lapping to Spec

Work is performed under documented process controls aligned with ISO 9001:2015.

04 · Certify

Inspect & Document

Flatness and finish are verified; lots ship with inspection records and certification.

Quality Assurance

Verifiable Precision

Flatness is not asserted — it is measured. Each lot is verified on temperature-stabilized metrology benches combining laser interferometry, white-light profilometry, and air gaging. Every micron is traceable to a calibrated standard.

µ-IN · 0.0
  • Laser InterferometryFlatness / Form
  • White-Light Profilometry3D Surface Texture
  • Stylus ProfilometerRa / Rz Roughness
  • Air GagingThickness / Parallelism
Verifiable Record

Proof, Not Claims

Coverage breadth, certified processes, and traceable inspection — surfaced as datasheet numbers, not marketing copy.

8 Lapping Processes Catalogued capabilities
3 States Service Coverage Illinois, Wisconsin & Indiana
18 Metros Local Pickup & Delivery Same-day couriers
1 Day Quote Turnaround Per business day
9001:2015 Quality System ISO standard
AS9100D Aerospace Programs Process documentation
1/10 λ Verified Flatness Floor Zygo interferometry
100% In-Process Inspection Per-lot certification
Data Matrix // Material Capabilities

Tolerances Achievable By Material Class

Material Class Typical Applications Min Thickness Flatness Ra
Technical Ceramics (Al₂O₃, AlN)Semiconductor chucks, seals0.005"1 light band< 1 µin
Silicon Carbide (SiC)Optics, wafer handling0.010"1/4 light band< 0.5 µin
Tool Steels / Tungsten CarbideStamping dies, cutting tools0.002"2 light bands< 2 µin
Exotic Alloys (Ti, Inconel)Aerospace components, medical0.015"2 light bands< 4 µin
Optical Materials (Sapphire, Fused Silica)Windows, lenses, substrates0.004"1/10 light bandSub-angstrom
Silicon WafersCMP, bonding, MEMS substrates0.005"1/4 light band< 0.5 µin
Service Coverage

Chicago Lapping Co Service Areas

Precision lapping coverage spans Illinois , Wisconsin , and Indiana , with dedicated landing pages for every metropolitan area in the index below.

View metropolitan coverage list

Local-pickup and freight coverage includes Chicago , Aurora , Schaumburg , Elgin , Joliet , Rockford , Milwaukee , Madison , Green Bay , Kenosha , Racine , Appleton , Waukesha , Indianapolis , Fort Wayne , Evansville , South Bend , and Hammond . Each city page covers the lapping processes available in that metro, typical lead times, and how to submit for a direct quote.

REGION: Illinois, Wisconsin & Indiana · 3 STATES · 18 METROS

Request For Quote

Request A Quote, Receive Tolerances

Quotes typically returned within one business day. Include drawings, target finish, and lot size — the response covers achievable flatness, lead time, and pricing for the part geometry.

Submission Form // v1.0
Up to 5 files, 10MB total.