If your Heian CNC router spindle is:
- Running hot
- Vibrating at high RPM
- Producing finish chatter
- Showing taper runout
- Or failing during long production cycles
You’re likely dealing with bearing fatigue, lubrication imbalance, or contamination.
Atlanta Precision Spindles rebuilds the spindle assembly only — restoring stability, balance, and predictable thermal performance.
🔎 Step 1: Identify Your Heian Spindle Type
Most Heian routers fall into one of these categories:
🔹 BT30 Spindles
Common in FP-series machines
- Up to ~18,000 RPM
- Grease lubricated
- Found in 5-axis compact platforms
Typical issue: Heat rise after long cycles.
🔹 BT35 Spindles
Common in ER, ZR, HR series
- 12 HP class
- Up to 24,000 RPM
- Often air/oil mist lubricated
Typical issue: Vibration increasing with RPM.
🔹 BT40 Spindles
Optional on some NC-series
- Higher torque routing
- Heavier tool loads
Typical issue: Taper wear or pull-stud stress.
🔹 HSK-63F High-Speed Spindles
Optional on higher-end models
- Excellent concentricity
- Extremely sensitive to contamination
Typical issue: Clamping instability and heat.
🔎 Step 2: Find Your Machine Model
Below are common Heian platforms (from documented references):
ER-431PBF-1631-RDX
- Dual 12 HP BT35 spindles
- 0–24,000 RPM
- Air/oil lubrication
Common problems:
- Uneven wear between heads
- Oil injector contamination
- High-speed imbalance
ZR-442PMC-2616W
- 4 spindle platform
- BT35 or optional HSK63F
- 24,000 RPM capable
Common problems:
- Multi-spindle alignment drift
- ATC taper fretting
- Heat rise during production runs
NC-151PMC-2616 (5-Axis Universal)
- BT35 / BT40 / HSK63F options
- 24,000 RPM
Common problems:
- Chatter during 5-axis moves
- Thermal growth affecting accuracy
- High-RPM bearing fatigue
FP-151PMC-2113
- BT30 ATC spindle
- 0–18,000 RPM
- Grease lubrication
Common problems:
- Grease breakdown
- Overheating at higher speeds
- Taper wear
⚠️ Common Heian Spindle Symptoms
Most Heian spindle failures start with:
✔ Gradual heat rise
✔ Increasing vibration at higher RPM
✔ Surface finish deterioration
✔ High-frequency bearing noise
✔ Tool life decreasing
If caught early, damage is usually limited to bearings.
🔧 How We Rebuild Heian Spindles
We restore:
- Correct bearing preload
- Dynamic balance (critical at 24k RPM)
- Taper integrity
- Seal protection
- Lubrication system stability (air/oil or grease)
Every spindle is:
- Fully disassembled
- Inspected
- Reassembled under controlled preload
- Balanced
- Thermally tested
The goal is smooth, stable rotation at operating speed.
Repair vs Replacement
Replacing a Heian spindle can involve:
- International sourcing
- Extended lead times
- Significant cost
A precision rebuild is often the faster and more economical option when the shaft and housing remain within tolerance.
Atlanta Precision Spindles repairs the spindle assembly only — not the Heian machine, controls, drives, or tool changer systems.
Not Sure What You Have?
Send us:
- Machine model
- Spindle taper type (BT30 / BT35 / BT40 / HSK63F)
- Lubrication type (air/oil or grease)
- Symptoms you’re seeing
We’ll help determine whether it’s likely bearing-related.