Precision Spindle Rebuilds by Atlanta Precision Spindles

K.O. Lee grinders and CNC surface grinders are trusted in metalworking, aerospace, automotive, and general manufacturing for their precision and durability. At the heart of these machines is the spindle — a high-precision rotating assembly that determines surface finish, accuracy, and machine performance.

Over time, even well-built spindle assemblies wear down, become contaminated, or fail due to lubrication issues. When that happens, expert repair is essential to restore performance and extend spindle life. Atlanta Precision Spindles offers professional spindle rebuild services tailored to K.O. Lee equipment, providing a cost-effective alternative to full spindle replacement.

Popular K.O. Lee Machines & Spindle Types

K.O. Lee is best known for surface and cylindrical grinding machines that often use precision spindle assemblies designed for low-to-moderate RPMs and heavy contact loads.

Examples of K.O. Lee Models

• SE618 Surface Grinder – A 6″ x 18″ table surface grinder with a high-precision spindle ideal for flat grinding tasks on a range of metals. These machines often rely on robust, grease-lubricated spindles that deliver consistent performance.

• SEH8182 CNC Surface Grinder – A larger CNC surface grinder with automated controls and a high-torque spindle designed for production environments and repeated precision grinding.

• 6062H Surface Grinder – A versatile machine with an automatic lubrication system and a high-performance spindle suited for larger parts and heavier workloads.

• Universal Cylindrical Grinders (e.g., 660 CNC) – These grinders use dedicated wheelhead spindles that may run up to ~20,000 RPM for specialized grinding operations.

Across these models, spindles are generally robust but require periodic rebuilding due to bearing wear, contamination, or lubrication breakdown.

Why K.O. Lee Spindles Fail

Spindle failure can occur for several reasons, many of which are common across grinding and milling spindles:

Bearing Wear and Lubrication Breakdown

Bearings in K.O. Lee spindles typically are greased or oil-lubricated at assembly. Over years of service, grease can dry out or break down, leading to bearing overheating and eventual failure.

Contamination

Grinding generates fine abrasive particles and coolant mist that can breach seals, especially on older machines, accelerating wear and surface damage in bearing races and internal components.

Run-out and Taper Wear

Wear on the wheelhead taper or run-out of the spindle nose can degrade accuracy and surface finish, leading shops to seek a spindle rebuild.

Structural Stress or Misalignment

Repeated heavy contact loads or improper setup can misalign spindle bearings or cause progressive failure over time.

Professional spindle analysis looks not just at worn parts but at the root causes of failure so repairs last longer.

OEM Spindle Service vs. Atlanta Precision Spindles

When a spindle fails, many shops first consider manufacturer or OEM repair options. Here’s how OEM service for K.O. Lee compares with independent specialists like Atlanta Precision Spindles.

OEM/K.O. Lee Service

Original equipment manufacturers and authorized service centers can provide:

• Spindle rebuilds using factory parts and specifications

• Warranty-supported repairs if still eligible

• Technical alignment with original machine configurations

For K.O. Lee grinders, LeBlond Ltd. — a current supporter of many legacy machine brands — provides spindle rebuild services for most K.O. Lee grinders, offering teardown, cleaning, bearing replacement, and functional restoration at roughly 30% less than the cost of a new spindle assembly.

OEM service is valuable when warranty coverage exists or when proprietary parts are required. However, lead times can be long, and cost may approach that of a new spindle — especially for out-of-warranty machines.

Atlanta Precision Spindles — Expert Independent Repair

Atlanta Precision Spindles offers a compelling alternative with advantages such as:

• Lower overall cost vs. OEM replacements

• Faster turnaround because spindle repair is the primary focus

• Detailed failure analysis with clear reporting

• Performance rebuilt to OEM tolerances or better

• Use of premium bearings and components to extend service life

Because independent specialists focus exclusively on spindle repair and rebuilding, they often deliver better communication, transparent pricing, and a deeper focus on spindle performance rather than machine service packages.