Analysis and elimination of common faults of small CNC milling machine spindles - SIerpu CNC machine tools

1. Fault phenomenon 1 - Spindle heating (1) The pre-tightening force of the spindle bearing is too large, causing excessive friction when the spindle rotates, causing the spindle temperature to rise sharply. It can be eliminated by re-adjusting the spindle bearing preload.

Analysis and elimination of common faults of small CNC milling machine spindles - SIerpu CNC machine tools







1. Fault phenomenon 1 - spindle heating

(1) The pre-tightening force of the spindle bearing is too large, causing the friction to be too large when the spindle rotates, causing the spindle temperature to rise sharply. It can be eliminated by re-adjusting the spindle bearing preload.

(2) If the spindle bearing is damaged or damaged, the friction will be too large when the spindle rotates, causing the spindle temperature to rise sharply. It can be eliminated by replacing the new bearing.

(3) The lubricating oil of the spindle is dirty or has impurities, which will also cause excessive resistance when the spindle rotates, causing the spindle temperature to rise. Remove the oil by replacing the headstock and re-changing the oil.

(4) If the spindle bearing is depleted of grease or too much grease, it will also cause the resistance and friction of the spindle to rotate too much, causing the spindle temperature to rise. Remove by reapplying the grease.

2. Fault phenomenon 2 - the spindle stops when the cutting is strong

(1) The transmission belt connected to the spindle motor and the spindle is too loose, causing the spindle transmission torque to be too small. When the powerful cutting, the spindle torque is insufficient, an alarm is generated, and the CNC machine tool automatically stops. Exclude by re-adjusting the tension of the spindle drive belt.

(2) The surface of the transmission belt connected to the main shaft motor and the main shaft has oil, which causes the transmission belt to slip when the main shaft is driven. When the main shaft torque is insufficient during strong cutting, an alarm is generated and the CNC machine tool automatically stops. Exclude by cleaning with gasoline or alcohol and wiping it clean.

(3) The transmission belt connected to the spindle motor and the main shaft fails to be used for a long time, causing the spindle motor torque to be unable to be transmitted. When the powerful cutting, the spindle torque is insufficient, an alarm is generated, and the CNC machine tool automatically stops. Eliminate by replacing the new spindle drive belt.

(4) The clutch and coupling in the spindle drive mechanism are too loose or worn, which causes the torque transmission error of the spindle motor to be too large, and the spindle vibration is strong during strong cutting. The alarm is generated and the CNC machine automatically stops. Exclude by adjusting or replacing the clutch or coupling.

3. Fault phenomenon 3——The noise is too large when the spindle is working

(1) The dynamic balance of the spindle components is poor, causing excessive vibration when the spindle rotates, causing operational noise. It is necessary for the machine manufacturer's professional to re-check and debug all the spindle components.

(2) The spindle transmission gear wears, so that the gear meshing clearance is too large, and the impact vibration is too large when the spindle rotates, causing working noise. The professional manufacturer of the machine tool is required to inspect, repair or replace the spindle drive gear.

(3) The main shaft support bearing is pulled or damaged, so that the main shaft rotation gap is too large, and the impact and vibration are too large during the rotation, causing working noise. Bearings from the machine manufacturer are required to inspect, repair or replace the bearings.

(4) The spindle drive belt is loose or worn, causing excessive friction when the spindle rotates, causing working noise. Eliminate by adjusting or replacing the drive belt.

4. Fault phenomenon 4 - the tool can not be clamped

(1) The displacement of the disc spring is too small, so that the spindle gripper and the clamping device cannot reach the correct position, and the cutter cannot be clamped.

Excluded by adjusting the length of the disc spring stroke.

(2) The spring collet is damaged, so that the spindle clamping device cannot clamp the tool. Eliminate by replacing the new spring collet.

(3) The disc spring fails, so that the spindle gripper and the clamping device cannot move to the correct position, and the cutter cannot be clamped. Excluded by replacing the new disc spring.

(4) The shank pull-up nail is too long, and it hits the spindle gripping knife and clamping device so that it cannot move to the correct position, and the tool cannot be clamped. Exclude by adjusting or replacing the rivets and installing them correctly.

5. Fault phenomenon 5 - Can not be loosened after the tool is clamped

(1) The pressure and stroke of the loose knife hydraulic cylinder are not enough. It is excluded by adjusting the hydraulic pressure and the position of the stroke switch.

(2) The disc spring is too tightly pressed so that the spindle clamp cannot move completely to the correct position and the tool cannot be loosened. By adjusting the nut on the disc spring, the amount of spring compression is reduced to eliminate it.






The overall R&D strategy of the company in 2014 still concentrates all resources on the segmentation of small CNC machine tools and does not extend the product line. It is based on existing products, improving the configuration and improving the details. Constantly improve the cost performance of the product.

The current mature products include: small CNC drilling and milling machines SXK04L and SXK05L series, making the most economical small multi-function machine. Can drill, can tap, can be milled.

Small machining center series: SXK06L, SXK07L series. Create the most cost-effective small CNC machining center.

Medium machining center series: SXK08L series. The configuration is all based on Taiwan's highest machine tool unit, Baoyuan CNC system, Tanjung's precision spindle, the popular tool magazine, the silver linear guide and the screw.




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