JNYO Boring and Milling Spindle Power Heads for High-Precision Hole Machining

JNYO boring and milling spindle power heads use radial and axial hydrostatic support with dual-film feedback throttling. They are suitable for high-precision hole machining in steel, cast iron, and non-ferrous metals. A square ram supports the spindle and improves rigidity, making the power head suitable for heavy milling of large parts and for machining vertical and angled surfaces in two perpendicular rotary planes. It can perform a range of complex operations, including vertical and face milling.

Because tool feed and rotation are synchronized, even thin or soft materials can be machined effectively. The diameter, pitch, and stroke of threaded machining can be adjusted to suit different requirements. Long travel and a broad range of accessories support both small- and large-batch production. A single-spindle tapping head can also be replaced with a multi-spindle tapping head. The spindle head uses a labyrinth waterproof design to help prevent coolant and dust from entering the spindle, supporting service life and accuracy while reducing failures and maintenance cost.

Measurement and Inspection Procedure

1. Visual inspection: Check the housing, connection points, and other components for cracks, deformation, loose screws, or other abnormalities. Every component should be complete and securely installed before performance testing.
2. Accuracy inspection: Measure radial runout at several spindle positions with a dial indicator. Rotate the spindle slowly through one revolution and record the difference between the maximum and minimum readings. Repeat the measurement and use the average value. To check axial movement, position the indicator along the spindle axis, move the spindle back and forth, and record the indicator range.
3. Speed testing: Verify no-load speed with a tachometer or the machine control display and compare it with the set speed. Under load, install a suitable tool and a representative material such as an aluminum block, then gradually increase cutting depth and feed rate while observing speed stability.
4. Torque measurement: Torque can be estimated from known cutting force and tool radius, using torque = cutting force × tool radius. For direct measurement, connect a torque sensor to the spindle to monitor actual torque output and assess whether it meets the machining requirement.
5. Temperature-rise monitoring: Record the initial temperatures of key areas such as the bearing housing and motor casing with an infrared thermometer. Run the power head for approximately 30–60 minutes and track temperature changes at regular intervals. Excessive temperature rise may indicate poor lubrication or inadequate heat dissipation.
6. Vibration analysis: Install acceleration sensors near the spindle to collect vibration signals in all relevant directions. After starting the power head, collect vibration data and perform spectrum analysis. The distribution of energy across frequencies can help identify imbalance, misalignment, bearing faults, and other early warning signs.