Keep the evidence with the model shortlist
The models on this page illustrate bearing roles; they are not confirmed replacements for an unspecified machine. Keep the original complete marking, machine position, load and speed duty, temperature, lubricant and mounting arrangement together. Check the candidate's recorded values below and leave unreported parameters unknown.
Check drawings and model records · Investigate a failure before replacing it · Plan installation and force paths
What matters in this application
Measuring architecture
Identify the machine's hard- or soft-support principle and the approved rotor mass, speed and geometry envelope. Use the manufacturer's setup and calibration instructions.
Rotor interfaces
Record journal diameters, spans, surfaces, center of gravity and drive method. Support rollers, arbors and mounted-bearing fixtures are different interfaces.
Repeatability and safety
Treat rollers, sensors, mounting and instrumentation as a system. Protective devices and rotor retention must suit the machine and test piece.
Which bearing structures make sense?
Roller-supported journals
A support architecture for suitable cylindrical rotor journals within the machine's rated range.
Check first: Check roller geometry and condition, journal finish, retention and the specified setup.
Mounted-bearing fixtures
Some machines can support a rotor through its assembled bearings or an approved fixture.
Check first: The fixture must preserve the measuring path and match the manufacturer's method.
Special arbors and supports
Investigate for discs, components without integral journals and other special rotor shapes.
Check first: Arbor error and mounting repeatability can affect results; an arbitrary catalogue bearing is not a qualified fixture.
Model selection & data availability
Use the selection requirements below to identify the exact specification. A general-purpose bearing is not presented as a substitute for an unverified specialist design.
Search an existing designation →Work through the selection
- Record machine make, model, support architecture and rotor geometry before selecting replacement support components.
- Inspect journals, rollers, fixtures and drive contact using the machine's safe isolation procedure.
- Replace only against the approved component specification and restore alignment, sensing and retention.
- Perform the prescribed calibration or verification and repeatability checks before evaluating production rotors.
Symptoms worth checking
Results change between repeat runs
Check seating, drive contact, fixtures, instrumentation and setup before attributing the change solely to rotor unbalance.
Different readings after support service
Verify the approved assembly procedure, alignment and calibration status.
Marks or roughness on support rollers
Inspect contact surfaces and loading; do not use uncontrolled grinding or preload changes to alter a measuring support.
Symptoms are investigation prompts, not a diagnosis. Isolate equipment safely and follow its maintenance procedures before inspection.
Have the original designation?
Look up the complete model and suffix before comparing potential alternatives.
Application questions, answered
Does hard-bearing mean a harder rolling-bearing material?
No. It refers to the balancing machine's support-system principle. Bearing material, clearance and precision grades are separate specifications.
Can I choose a support bearing from rotor shaft diameter alone?
No. The machine geometry, force path, roller or fixture design, measuring range and approved component specification are also required.
Why is there no generic bearing shortlist?
A normal catalogue bearing does not establish measurement accuracy, fixture suitability or safe rotor retention. This database has no verified machine-specific replacement list for these supports.
Can a bearing-frequency calculator replace balancing-machine verification?
No. A fault-frequency calculation estimates kinematic frequencies for a specified rolling bearing; it does not calibrate the balancing machine or certify residual unbalance.
Reference basis & recommendation limits
- Schenck RoTec — HM Horizontal Balancing Machines
- Schenck RoTec — HM 4–40 / HM 5–50 Sequence of Operation
Application principles are informed by the listed technical references. Model shortlists are BearingScope editorial selections from its database, not manufacturer endorsements or equipment-fit approvals. Confirm the latest exact specification and the complete equipment design before use.