High-Speed BT & HSK Electrospindle Rebuild Services

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.