Repair of Haas Spindle

Haas spindles are among the most widely used components in CNC machine tools worldwide. Thanks to their reliability and advanced design, they are utilised in many industrial sectors. At Fumak, we specialise in comprehensive Haas spindle repairs, covering standard models, high-speed variants, and liquid-cooled versions. With our technicians' expertise and advanced technical facilities, we restore full spindle functionality in a short time.

About the Haas spindle

Haas Automation is a US-based company and one of the world's largest manufacturers of CNC machine tools. Founded in 1983, it has delivered innovative solutions for over four decades that revolutionized the machining industry. Continuous development and investment in technology have made Haas a symbol of reliability, durability, and accessibility of advanced machines for a wide range of customers – from small workshops to large production facilities.

Diagnosis and Disassembly – Thorough Fault Analysis

Haas spindle repair begins with a detailed technical diagnosis to identify the root cause of the fault. We disassemble the spindle and inspect all components – from bearings through lubrication systems to cooling and sensors. Common Haas spindle issues include damage caused by overload, improper lubrication, or wear of rolling elements. Each fault is documented and discussed with the client before repairs commence.

Spindle Reception

Device registration.
Initial visual inspection (mechanical damage, overheating marks, oil/grease leaks).

Preliminary Diagnosis (without disassembly)

Shaft runout measurement.
Check of radial and axial play.
Acoustic testing.
Rotation test (if possible) – only for motor spindles with working drive.

Spindle Disassembly

Disassembly into individual components.
Damage documentation.
Assessment of bearings, seals, rotor, shaft, taper, housing.

Cleaning and Technical Evaluation

Ultrasonic or chemical washing.
Component wear assessment.
Identification of parts for replacement or refurbishment.

Quotation and Approval

Service report and quotation.
Waiting for customer approval.

Repair and Assembly

Replacement of bearings, seals, socket refurbishment.
Winding, sensor, encoder repairs (in motor spindles).
Precise adjustment of clearances and alignment.
Assembly in clean conditions with proper balancing.

Final Testing

Vibration and noise measurement.
Thermal and load tests.
Electrical tests for motor spindles.

Final Report and Shipping

Final documentation.
Proper protection of the spindle for transport.

Component Refurbishment and Haas Spindle Assembly

Depending on the damage severity, we refurbish, replace, or precisely manufacture parts such as bearings, bushes, and rotating elements. We use only certified replacement parts and modern measurement technologies. After refurbishment, the spindle is assembled under controlled conditions, maintaining high cleanliness and exact adjustment. Haas spindles repaired by us are tested on benches simulating real working conditions.

Service, Testing, and Warranty

Each Haas spindle is subjected to detailed dynamic tests and performance measurements, including radial runout, vibration levels, and achievable rotational speeds. We also offer spindle commissioning at the client’s machine and full service support. All repairs are covered by a warranty.

Differences Between Classic Spindle and Motor Spindle Haas

Aspect	Classic Spindle	Motor Spindle
Drive	External (e.g., belt drive)	Built-in motor
Diagnostics	Primarily mechanical	Mechanical + electrical
Sensors/Electronics	None or minimal	Encoders, sensors, control system
Service Complexity	Low to medium	High – requires special tools and expertise
Balancing	Rotor and shaft	Entire motor-rotor unit
Spare Parts	Standard	Dedicated, hard to source
Repair Cost & Time	Usually lower	Usually higher – due to precision and electronics

Summary

Service of classic Haas spindles focuses on mechanical aspects – bearing replacement, clearance setting, cleaning. Motor spindle service also requires knowledge of electromechanics and electronics. Therefore, repair should be carried out in laboratory conditions with the highest precision and cleanliness.