The Bernardo WBS640PRO is a twin-drum sander designed for accurate sanding and thicknessing of wooden workpieces. Unlike single-drum sanders, the WBS640PRO is equipped with two Ø 130 x 635 mm sanding drums, allowing two different abrasive grits to be used for coarse and fine sanding in a single pass.

The machine offers a maximum sanding width of 635 mm and can handle workpieces with a thickness from 5 to 130 mm. Its conveyor belt features a continuously adjustable feed speed from 0 to 6.2 m/min, allowing the feed rate to be adapted to the type of wood, abrasive grit and required finish.

Depending on the version, the WBS640PRO is available in 230 V or 400 V and features a 2.2 kW (3 hp) main motor.

This category contains spare parts for the Bernardo WBS640PRO drum sander for maintenance, troubleshooting and repair.

Spare parts for the twin sanding drums of the WBS640PRO

One of the main features of the Bernardo WBS640PRO is its twin-drum sanding system.

Each sanding drum measures Ø 130 x 635 mm. This configuration allows two different abrasive grits to be fitted at the same time. The first drum can be used for coarse sanding, while the second provides a finer finish.

The two drums are dynamically balanced to help reduce vibration and provide smooth operation.

Abrasive fixing components, shafts, bearings, supports and other parts associated with the sanding drums must be kept in good condition to maintain the sanding quality of the machine.

Conveyor belt for Bernardo WBS640PRO

The conveyor belt feeds the workpiece smoothly beneath the two sanding drums.

Its condition is particularly important. A loose, worn, damaged or slipping conveyor belt can cause irregular workpiece movement and directly affect sanding and thicknessing accuracy.

The WBS640PRO also features a system for adjusting the parallel tracking of the conveyor belt.

If the belt gradually moves to one side, its tracking should therefore be checked and adjusted before assuming that a component needs to be replaced.

Feed motor and conveyor system parts

The conveyor belt is driven by an independent feed motor, providing a consistent workpiece feed.

The feed speed is continuously adjustable from 0 to 6.2 m/min. This allows the operator to adapt the conveyor speed to the wood species, abrasive grit and amount of material to be removed.

If the conveyor belt stops, moves intermittently or lacks drive, several components should be checked: feed motor, transmission, rollers, conveyor belt tension, speed control and electrical connections.

A conveyor feed problem does not automatically mean that the feed motor needs to be replaced.

Drive and transmission parts for Bernardo WBS640PRO

Various mechanical components transmit movement between the motors, sanding drums and conveyor system.

Depending on the assembly concerned, these may include gears, pulleys, drive belts, shafts, bearings, bushes and other transmission components.

These parts are subject to mechanical loads and may gradually wear during operation.

Unusual noises, vibrations, excessive play or loss of drive may indicate that one of these components needs to be inspected or replaced.

Electrical spare parts for Bernardo WBS640PRO

The WBS640PRO uses various electrical components to operate the main motor and conveyor feed system.

This category includes electrical spare parts for the Bernardo WBS640PRO required for troubleshooting, maintenance and repair.

Before replacing a motor, switch or control component, it is advisable to check the power supply, safety devices, electrical connections and other components that could be responsible for the fault.

Accurate troubleshooting can help avoid replacing a component that is still working correctly.

Check the 230 V or 400 V version of your WBS640PRO

The Bernardo WBS640PRO is available in 230 V and 400 V versions.

This difference is particularly important when ordering certain electrical parts, including motors, switches, contactors and other components directly related to the power supply.

An electrical component intended for a 230 V WBS640PRO should not automatically be considered compatible with the 400 V version, and vice versa.

Before ordering an electrical spare part, carefully check the voltage shown on your machine's identification plate.

Height adjustment and mechanical parts for the WBS640PRO

The Bernardo WBS640PRO allows the working height to be accurately adjusted according to the thickness of the workpiece.

Adjustment is carried out using a handwheel and graduated scale. The machine also features a fine adjustment system for the rear sanding drum, which is particularly important for obtaining consistent results from both drums.

Components in the adjustment mechanism can gradually wear, including shafts, screws, nuts, bushes, supports, guides and other mechanical parts.

Excessive play or a damaged component can affect sanding and thicknessing accuracy.

Sanding strips for Bernardo WBS640PRO

Sanding strips for the Bernardo WBS640PRO are essential consumables for the machine.

One of the main advantages of this drum sander is the possibility of using two different abrasive grits simultaneously. The machine is supplied with 80-grit and 120-grit abrasives as standard.

For example, a coarser abrasive can be fitted to the first drum for initial material removal, while a finer abrasive on the second drum improves the surface finish immediately afterwards.

A worn, clogged, torn or inefficient abrasive should be replaced to maintain good sanding performance.

Why use two different abrasive grits on the WBS640PRO?

The twin-drum system is one of the main differences between the WBS640PRO and a conventional single-drum sander.

The first abrasive can perform the initial coarse sanding while the second immediately refines the surface.

This makes it possible to perform two sanding stages in a single pass, saving considerable time when processing multiple or repetitive workpieces.

For consistent results, however, both abrasives must be correctly installed and the rear sanding drum must be properly adjusted.

Why is the Bernardo WBS640PRO conveyor belt not feeding correctly?

If the conveyor belt on your Bernardo WBS640PRO stops moving, slips, tracks to one side or moves intermittently, there may be several possible causes.

First check the condition and tension of the conveyor belt, its tracking, the rollers, transmission components and feed motor.

The speed control system should also be checked.

A conveyor belt that gradually moves towards one side may simply require a tracking adjustment. The machine is specifically equipped with an adjustment system for correcting conveyor belt tracking.

Dust extraction on the Bernardo WBS640PRO

With two sanding drums and a working width of 635 mm, the WBS640PRO can generate a considerable amount of sanding dust.

The machine is equipped with two Ø 100 mm dust extraction ports.

It is important to connect the drum sander to a sufficiently powerful dust extraction system to efficiently remove dust produced by both sanding drums.

Insufficient extraction encourages dust to accumulate around the abrasives and mechanisms and can also cause the sanding strips to clog more quickly.

Identify the part on the Bernardo WBS640PRO exploded diagram

To find the correct Bernardo WBS640PRO spare part, use the exploded diagram corresponding to your machine.

The various components are identified by item numbers, making it easier to locate the required replacement part.

Before ordering, compare the item number with the information provided on the product page and check the details shown on your machine's identification plate.

This is particularly important for electrical components because the WBS640PRO is available in both 230 V and 400 V versions.

Check compatibility before ordering

Certain Bernardo WBS640PRO spare parts may also be suitable for other drum sanders or machines of similar design.

However, this does not mean that all parts are interchangeable.

Two motors, bearings, drive belts, electrical components or mechanical parts that look similar may have different specifications or dimensions.

IMPORTANT: BEFORE PURCHASING, always check the list of compatible machines shown on the product page and, where required, the month and year of manufacture or the serial number of your machine.

Maintain your Bernardo WBS640PRO drum sander

Regular maintenance helps preserve the accuracy, reliability and performance of the WBS640PRO.

Regularly remove accumulated sanding dust from around the drums and mechanisms, inspect the sanding strips and conveyor belt, and check the condition of the drive components.

Also monitor conveyor belt tracking and the condition of both sanding drums.

Efficient dust extraction and abrasives in good condition help reduce unnecessary strain on the machine while improving sanding quality.

Before cleaning, adjustment, maintenance or repair work, always disconnect the Bernardo WBS640PRO from the power supply.

Repair your Bernardo WBS640PRO with the correct spare part

A conveyor problem, worn drive belt, damaged bearing, faulty adjustment component or electrical problem does not necessarily mean that the complete drum sander needs to be replaced.

Our selection of spare parts for the Bernardo WBS640PRO allows individual components to be replaced for machine maintenance and repair.

Before ordering, accurately identify the required component on the exploded diagram and check the machine version, voltage, manufacturing date and, where necessary, serial number.

Choosing the correct spare part for your Bernardo WBS640PRO drum sander helps you repair the machine efficiently and extend its service life.