Precision.Performance.Reliability.
Expert spindle repair, CNC machine services, and industrial solutions — done right. One of the oldest and largest independently owned spindle repair companies in the United States.
Comprehensive spindle & precision machining services
Restore accuracy, reduce runout, and extend equipment life with craftsmanship trusted across aerospace and high-speed manufacturing.
SVC-01Spindle Repair
→Full-service spindle repair — comprehensive inspection, precision repair, and balancing to OEM specification, backed by guaranteed performance. Restore accuracy and extend spindle life while minimizing downtime.
SVC-02On-Site Taper Grinding
→On-site machine tool taper grinding for CAT, BT, HSK, and BIG-PLUS tapers. Reduce runout, restore toolholding performance, and extend machine life with full pre- and post-grind inspection.
SVC-03Precision Machining & Grinding
→Precision machining, grinding, and OEM/custom part replication. Reverse engineering for obsolete components with fast turnaround — superior accuracy and performance through expert craftsmanship.
SVC-04New & Custom Spindles
→Custom-built spindles engineered for precision, performance, and durability — new spindles tailored to your unique machining requirements.
Three stages. One standard: OEM spec.
Comprehensive Inspection & Analysis
Full diagnostics identify wear, runout, bearing condition, and root cause before any work begins.
Precision Repair & Balancing
Components are machined, ground, and dynamically balanced back to original manufacturer tolerances.
Guaranteed Performance
Every spindle is tested and verified against OEM specification, backed by our performance guarantee.
Precision measured in microns
A temperature-controlled facility, master-technician expertise, and state-of-the-art metrology — engineered for the tightest tolerances.
Dynamic and static balancing to G0.4 quality standard — from under ½ lb to 200 lbs of rotating mass.
Temperature-controlled environment where 5 µm (0.0002 in) ID/OD tolerances after grinding are common.
Clean assembly room with presses to 150 tons and highest-precision measuring instruments.
Turning up to 60" between centers and 16" diameter; grinding to 36" length and 12" diameter; milling 30 × 20 × 20.
Authorized partner for the world's leading spindle makers
Ortlieb
GermanyExclusive Americas partner
Centerline Inc. is the exclusive Ortlieb tool and work holding partner in the Americas — precision tool clamping and work holding solutions.
Alfred Jaeger
Ober-Mörlen, GermanyExclusive Jaeger-authorized repair facility, Americas
Jaeger high-frequency spindles excel in milling, grinding, drilling, and engraving. Centerline Inc. is the exclusive Jaeger-authorized repair facility in the Americas.
Henninger
Straubenhardt, GermanyAuthorized partner
Henninger designs and manufactures all tools in Germany, delivering industry-leading quality, precision, and innovation.
Renaud
SwitzerlandAuthorized partner
R. Renaud AS delivers Swiss-quality belt-driven, motorized, and high-frequency spindles with expert-engineered solutions and power outputs up to 25 kW.
SycoTec (KaVo)
Leutkirch, GermanyAuthorized partner
A spin-off of KaVo, SycoTec has innovated drive and spindle solutions for dental, medical, machine tools, precision mechanics, aviation, and optics for over 50 years.
Also stocked
- · Frequency Converters
- · Chillers / Cooling Units
- · Collets / Tool Clamping / Work Holding
- · Spindle Parts
- · Motor Elements
Among the oldest independently owned spindle repair companies in the U.S.
Centerline, Inc. is dedicated to minimizing machine downtime by providing exceptional spindle repair, new spindles, system upgrades, and precision-machined parts across a wide range of industries.
As a family business built over three decades, we prioritize customer satisfaction through open communication, clear expectations, and quality service — the same values our founder, Michael Engster, built the company on.
More about Centerline →
In Loving Memory of
Michael Engster
Founder of Centerline Inc. and the heart and foundation of our family business. His work ethic, loyalty, and craftsmanship shaped Centerline and the relationships we've built over three decades.
Read his tribute →Relied on by leaders in aerospace & manufacturing
Centerline keeps critical spindles running for aerospace primes, automotive suppliers, and tooling manufacturers across the U.S. and Mexico.
Minimize downtime. Restore precision.
Talk to our spindle specialists about repair, taper grinding, or a custom build. Fast turnaround, guaranteed performance.