HCB71905-E-T-P4S-UL Precision Spindle Bearing
|
Brand |
= |
SEMRI |
|
Manufacturer Part Number |
= |
HCB71905-E-T-P4S-UL |
|
Inside Diameter |
= |
25mm |
|
Outside Diameter |
= |
42mm |
|
Width |
= |
9mm |
|
Contact Angle |
= |
25° |
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Precision Grade |
= |
P4S |
|
Seals or Shields |
= |
None |
|
Material |
= |
Hybrid Ceramic |
|
Clearance |
= |
CN = Standard Internal clearance |
|
Cage Type |
= |
T = Outerring Guided Phenolic Cage |
Primary Application Fields
Thanks to the specific engineering combination of a \(25^{\circ }\) contact angle (E)and silicon nitride ceramic balls (HCB), this bearing is explicitly engineered for components that experience simultaneous high speeds and substantial axial or moment loads[363628].
1. Machine Tool Spindles (High Rigidity Milling & Turning)
This is the most dominant application for this specific part number.
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High-Speed Machining Centers (HSM): Used in motorized and belt-driven spindles performing both roughing and finishing operations on non-ferrous metals and mold steel. The \(25^{\circ }\) angle handles the heavy axial forces generated during aggressive Z-axis plunge cuts and high-feed milling.
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CNC Tapping and Drilling Centers: Ideal for rigid tapping spindles that undergo frequent, rapid reversals and continuous axial hammering while cutting threads or drilling deep holes.
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Turn-Mill Complex Spindles: Installed in the B-axis milling heads of multi-tasking CNC machines, where the spindle must tilt and withstand multi-directional cutting forces.
2. Precision Grinding Machinery
Grinding requires extreme rigidity to eliminate chatter marks and ensure micro-inch surface finishes.
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Internal Grinding Spindles: Supports high-speed, high-rigidity internal grinding quills.
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Surface & Cylindrical Grinding Heads: The \(25^{\circ }\) contact angle prevents microscopic spindle deflection when the abrasive grinding wheel rams into hard, treated metals.
3. Semiconductor & Specialty Processing Equipment
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Wafer Dicing Saws: Supports the high-speed spindle cutting brittle silicon wafers, maintaining absolute axial positioning accuracy within microns.
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PCB Routing and Profiling Centers: Used in printed circuit board routers. Unlike pure drilling (which favors a \(15^{\circ }\) 'C' angle for speed), PCB routing requires the 'E' angle to counter heavy side-loads during lateral cutting.
4. Advanced Dynamic Testing & Metrology
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Dynamic Balancing Rig Spindles: High-speed test spindles that require the bearing itself to run with virtually zero vibration and high stiffness to capture accurate imbalance data.
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