Quick Guide to Common Radial Drilling Machine Troubleshooting: From Unusual Noise to Loss of Accuracy, All in One Article!

1. Troubleshooting Abnormal Noise in Radial Drilling Machines

Abnormal Spindle Box Noise (Buzzing/Metallic Friction)

Possible Causes:

Spindle bearings lacking lubrication or worn (common in equipment that has not been maintained for a long time).

Gearbox lubricant deteriorating or gears not meshing properly.

Belt loose or worn (V-belt drive models).

Solution:

Check the lubrication system: Ensure adequate oil levels in the spindle bearings and gearbox.

Replace the bearings: If the abnormal noise is accompanied by heat, disassemble and replace the spindle bearings.

Adjust the belt tension: Press the center of the belt with your finger until 5-8mm of depression is ideal.

2. Jamming/Stiffness in the Arm Lifting/Lifting

Difficulty in Lifting the Arm (Handle Unmovable)

Possible Causes:

Worn lifting screw or nut, resulting in poor engagement.

Insufficient guide rail lubrication, increasing friction.

Failed balance spring (common in older radial drills).

Solution:

Clean and lubricate the guide rails: Clean the guide rails with kerosene and then apply lithium-based grease.

Check the lead screw nut: If the play is excessive (>0.5mm), replace the nut (copper nuts are more wear-resistant).

Adjust the balance spring: Adjust the preload according to the manual, or replace the spring.

Emergency Tip: Gently tap the rocker arm while manually cranking to temporarily relieve any sticking.

3. Decreased Drilling Accuracy (Deviated/Oval Hole)

Drilled Hole Position Shifted or Oval

Possible Causes:

Excessive spindle bearing clearance (radial runout >0.02mm).

Insecure drill bit clamping (loose taper shank or drill chuck).

Instable workpiece clamping (deflection caused by vibration).

Solution:

Check spindle radial runout: Measure with a dial indicator. If out of tolerance, adjust the bearing preload.

Replace the drill chuck: Choose a high-precision chuck.

Reinforce the workpiece: Use a pressure plate and shims to prevent shifting during machining. Preventative Measures: Regularly check the cleanliness of the spindle taper to prevent iron chips from affecting positioning.

4. Automatic Feed Failure (No Feed/Uneven Feed)

Automatic Feed Mechanism Malfunction

Possible Causes:

Feed box gears or clutch wear.

Hydraulic feed models: Oil circuit blockage or insufficient oil pressure.

Electrical control failure (CNC models).

Solution:

Mechanical feed box: Disassemble and inspect the gear train and replace broken teeth or worn parts.

Hydraulic feed models:

Check the oil filter for blockage and replace the hydraulic oil.

Adjust the relief valve pressure to the standard specified in the manual (usually 2-3 MPa).

CNC models: Check the servo motor driver alarm code and reset or replace the cable.

Note: If automatic feed fails, do not force manual feed to avoid gear damage!

Radial Drilling Machine

Other Common Faults Quick Reference

Radial Drilling Machine Maintenance Tips: 3 Steps to Extend Equipment Life

Daily Maintenance:

Clean away scrap metal and check the lubricant level.

Manually rock all mechanisms before starting the machine to confirm they are not binding.

Monthly Inspection:

Tighten the anchor bolts to prevent loosening due to vibration.

Replace any turbid or deteriorated lubricant.

Annual Overhaul:

Disassemble and clean the spindle housing and replace worn bearings and gears.

Calibrate the column for verticality (error ≤ 0.02 mm/m).