WANLONG
A bridge stone cutting machine works in a wet, abrasive environment where water, stone dust and slurry can affect mechanical, hydraulic and electrical components. Regular maintenance helps keep the machine running smoothly and makes it easier to identify problems before they cause longer downtime.
Common problems include the worktable failing to lift or rotate, the machine body gradually drifting during cutting, uncontrolled blade feeding, abnormal noise during travel, and the machine stopping at a certain position.
This guide covers the main maintenance points and several common faults found on bridge stone cutting machines.
Quick Answer: What Should Be Checked on a Bridge Stone Cutting Machine?
The main maintenance areas are the lubrication system, hydraulic oil, travel mechanism, worktable mechanism and electrical control system.
For troubleshooting, start with the actual symptom. For example:
- The machine body drifts during cutting: check the clamping cylinder and hydraulic system.
- The motor runs but the machine body does not move: check the clutch and its electrical circuit.
- The motor does not start: check for phase loss, motor problems and inverter protection.
- The machine makes abnormal noise or stops at a fixed position: inspect the racks and their fastening.
Regular inspection of these components can reduce unexpected downtime and help maintain stable cutting performance.
1. Lubrication and Hydraulic Oil Maintenance
Proper lubrication is one of the most important routine maintenance tasks for a Bridge Stone Cutting Machine.
Check the Oil Pools and Guide Rails
The rack supports at both ends of the machine body have oil pools that should remain properly sealed and filled to the required oil level.
The V-shaped guide rails and travel racks inside the machine body oil pools should also have sufficient oil. If the oil becomes contaminated, deteriorates or contains water, replace it promptly.
Water contamination is particularly common in stone processing environments, so the condition of the oil should be checked regularly rather than relying only on a fixed replacement interval.
Lubricate the Vertical Guide System
The manual pump used for the vertical round-guide lubrication system should be filled with No. 30 machine oil.
Lubricate the system at least once per shift.
Regular lubrication reduces friction between moving components and helps maintain smooth vertical movement.
Check the Gearbox Oil Level
Check the oil windows on:
- The front and rear travel reducers
- The blade-feed reducer
- The main spindle gearbox
The oil level should be checked regularly, and the gearbox oil should normally be replaced at least once a year, or according to the machine manufacturer’s maintenance requirements.
2. Lubricate the Worktable Turning and Rotation Mechanisms
The following lubrication points on the tilting worktable should be lubricated with oil or grease once per shift:
- Worktable tilting shaft
- Tilting cylinder support
- Piston rod support shaft
- Worktable rotation gear transmission
At the end of each working shift, raise the worktable before shutting down the machine.
This allows the tilting mechanism to move through its working position and helps prevent the mechanism from remaining in one position for too long. It also allows water on the worktable to drain and dry, reducing the risk of the wooden support boards becoming damp and deteriorating.
3. Inspect the Buttons, Relays and Electrical Connections
The control box for worktable tilting and rotation is exposed to water splashing during stone cutting.
Over time, moisture can cause oxidation or corrosion on the button contacts and lead to poor electrical contact.
Inspect the control buttons regularly and clean any corrosion when necessary.
Check the PLC Relays
The PLC control system uses multiple small relays. Because these relays have relatively small contact capacities and may operate frequently, poor contact can develop over time.
If a relay is suspected of causing an intermittent fault, check or replace it according to the electrical control diagram and the manufacturer’s service procedure.
For older relay types, cleaning the contacts may sometimes restore operation, but replacement is preferable when the contacts are badly worn or damaged.
Check Solenoid Valve Connectors
Loose or oxidized connectors on the solenoid valves can also cause intermittent hydraulic faults.
Check the connectors for:
- Loose connections
- Oxidation
- Water contamination
- Damaged wires
- Poor electrical contact
Repair or replace faulty connectors as necessary.
4. Troubleshooting: Machine Body Gradually Drifts During Cutting
Symptom
The machine body begins to move gradually or loses its position during cutting.
Possible Causes
The hydraulic clamping system may not be maintaining sufficient pressure.
If the machine cannot clamp properly from the beginning, the clamping cylinder may be seized or heavily corroded.
If the machine clamps normally at first but gradually releases during cutting, the hydraulic system and solenoid valve should be checked.
How to Fix It
First, inspect the clamping cylinder.
If the cylinder is seized, remove it for cleaning or replace it if necessary.
If the cylinder initially clamps but gradually loses pressure:
- Check and clean the solenoid valve spool.
- Check the hydraulic oil for foam or water contamination.
- Check whether the hydraulic oil has deteriorated.
- Replace the hydraulic oil if contamination or deterioration is confirmed.
- Check whether the clamping cylinder can maintain pressure after servicing.
Foaming, water contamination or deteriorated hydraulic oil can cause the clamping cylinder to lose pressure automatically, allowing the machine body to move during cutting.
5. Troubleshooting: Motor Runs but the Machine Body Does Not Move
Possible Cause
The clutch is not engaging.
How to Check
First check whether relay K12 is operating correctly.
A multimeter can be used to check the relevant points in the electrical circuit and determine whether the clutch coil and wiring are functioning correctly.
Common causes include:
- Broken clutch coil wire
- Poor connector contact
- Damaged wiring
- Faulty relay
- Clutch coil failure
Check the electrical circuit according to the machine’s wiring diagram before replacing components.
6. Troubleshooting: The Motor Does Not Run
Possible Causes
The motor may be running with phase loss, causing the inverter to activate its protection function.
A clamping cylinder that cannot release properly can also increase the motor load and cause overcurrent protection.
How to Fix It
Check the following items:
- Check whether the motor has been damaged or burned out.
- Check the three-phase power supply for phase loss.
- Inspect the motor cables and terminals.
- Check whether the clamping cylinder can release normally.
- If the clamping cylinder is stuck, remove and clean it.
- Check the inverter fault indication and reset it only after the underlying problem has been corrected.
Do not repeatedly reset the inverter without identifying the reason for the protection fault. Repeated overcurrent or phase-loss conditions can damage the motor or drive system.
7. Troubleshooting: Abnormal Noise or Sudden Stopping During Travel
Possible Cause
The travel racks inside the oil pools on both sides of the machine body may have broken teeth, excessive clearance or loose fasteners.
How to Fix It
Inspect the racks on both sides for:
- Broken or missing teeth
- Loose rack sections
- Excessive clearance
- Incorrect rack alignment
- Loose fixing components
The rack sections near both ends of the machine are particularly worth checking because they can become loose during long-term operation.
If the gap between two rack sections becomes greater than approximately one tooth pitch, the machine may produce abnormal noise when it reaches that position and then stop suddenly.
After correcting the rack position, make sure the locating pins and fixing screws are properly secured.
Bridge Stone Cutting Machine Maintenance Checklist
| Maintenance Item | What to Check | Recommended Action |
|---|---|---|
| Guide rails | Oil level and contamination | Lubricate and replace contaminated oil |
| Travel racks | Wear, broken teeth and looseness | Repair, align or replace |
| Gearboxes | Oil level and condition | Check regularly and replace oil as required |
| Vertical guide system | Lubrication | Lubricate at least once per shift |
| Worktable mechanism | Shafts, gears and cylinders | Lubricate every shift |
| Hydraulic oil | Level, foam and water contamination | Replace deteriorated oil |
| Clamping cylinder | Clamping and pressure holding | Clean, repair or replace |
| Electrical buttons | Corrosion and poor contact | Clean or replace |
| Relays | Intermittent contact | Test and replace when necessary |
| Solenoid connectors | Loose or oxidized contacts | Clean and secure |
| Clutch | Coil and wiring | Check electrical circuit |
| Motor | Phase loss and overload | Check power supply and motor |
| Inverter | Protection alarms | Identify and correct the cause |
| Racks | Noise and sudden stopping | Check alignment and fastening |
How to Reduce Common Cutting Machine Problems
Most of the faults discussed above are easier to deal with when the machine is inspected regularly.
A practical maintenance routine should include:
- Lubricating moving mechanisms on schedule.
- Checking hydraulic oil before contamination becomes serious.
- Keeping electrical control components dry where possible.
- Checking connectors and wiring for loose contacts.
- Inspecting racks for wear and looseness.
- Checking the clamping system when the machine starts to drift.
- Recording recurring faults so the same problem can be traced more quickly.
For machines working long hours in wet stone-processing environments, maintenance intervals may need to be adjusted according to actual operating conditions.
Choosing the Right Cutting Tools
Machine maintenance is only part of maintaining stable cutting performance. The condition and specification of the Diamond Saw Blade also affect cutting speed, blade life and the load placed on the machine.
The saw blade should be matched to the material being processed, the required cutting depth and the machine’s operating parameters.
For projects processing different types of granite, marble or other stone, the Diamond Segment specification may also need to be adjusted according to the material characteristics and cutting conditions.
What Matters Most in Bridge Stone Cutting Machine Maintenance?
A bridge stone cutting machine works with water, abrasive slurry and heavy mechanical loads every day. Keeping the lubrication, hydraulic, electrical and travel systems in good condition is therefore essential for reliable operation.
When a fault occurs, avoid replacing parts immediately without checking the symptom and related system first. A machine that drifts during cutting, for example, requires a different inspection path from one that makes noise and stops at a fixed travel position.
A systematic check of the hydraulic system, electrical controls, clutch, racks and lubrication points can make troubleshooting faster and help prevent small problems from becoming longer production stoppages.
Frequently Asked Questions
How often should a bridge stone cutting machine be lubricated?
Several lubrication points should be serviced once per shift, including the vertical guide system and worktable mechanisms. Gearbox oil levels should also be checked regularly, with oil replacement based on the machine’s maintenance requirements and operating conditions.
Why does a bridge saw move or drift during cutting?
A common cause is loss of clamping pressure. Check the clamping cylinder, solenoid valve and hydraulic oil condition. Water-contaminated or deteriorated hydraulic oil can contribute to pressure loss.
Why does the motor run but the machine does not move?
Check the clutch first, including the clutch coil, relay, connectors and wiring.
Why does the bridge saw suddenly stop at the same position?
Inspect the travel racks on both sides of the machine. Broken teeth, loose rack sections or excessive gaps between rack sections can cause abnormal noise and sudden stopping.
Why does the inverter protect the motor?
Phase loss, excessive motor load or other electrical faults can trigger inverter protection. The power supply, motor, cables and mechanical load should be checked before resetting the inverter.
Can regular maintenance improve stone cutting performance?
Yes. Proper lubrication, clean hydraulic oil, reliable electrical connections and correctly adjusted mechanical components help reduce friction, unexpected stops and other operating problems. Machine maintenance should be combined with appropriate saw blade selection and operating settings.
