LDG50 Centrifugal Disc Finishing Machine


Inovatec centrifugal disc finishing machines provide 10 times effective faster-grinding speed compared with conventional vibratory finishing machines. Centrifugal disc finishing machines are typically for small to medium-sized component surface finishing applications.

For special finishing requirements, the centrifugal disc finishing machine is especially used for super fine and mirror finishing of a specific component or component of the special surface requirement.

1. Processing unit (work bowl)

The processing bowl is cast with DuPont hot molded PU lining with a thickness of 20-25mm for long service time and high durability.

2. Disc rotating system

High-speed control with optional speed inverter from Bosch Rexroth

Adjustable gap between disc and ring

3. Water process system

Compound/water dosing system available with a tap

PLC touch screen control with Siemens optional

4. Rigid machine construction

Working principle

The rotating disc with a speed of 60-250 RPM pushes the tumbling media and components mixture upward to the wall of the processing bowl and downward to the processing bowl center. Reduced acceleration force and enhanced gravity force cause the mixture to slide back down to the disc where it is again accelerated. Depending on the disc rotation speed, the water level as well as media/compound combination, the finishing applications vary from fast grinding to super fine mirror polishing.

The high-energy centrifugal disc finishing machine offers productivity 10-30 times higher compared with the conventional vibratory finishing process.



The area of application including deburring, surface grinding, radiusing, and polishing of components with a thickness of around 0.2mm and larger gear components with more than 150mm. Typically stamping parts, casting parts, machined parts, and tuned parts processed with high speed of the centrifugal disc finishing machine can achieve desirable performance in a relatively short processing time. Besides, it can achieve a high degree of automation with a combination of different other finishing technology according to user requirements.

coin blank polishing


  • Tilting angle of processing bowl up to 135°
  • Optional circular pipe to rinsing and compound dosing
  • Gap adjustment for the machine for disc and ring
  • With automatic control processing bowl can be tilted mechanically with a gear motor
  • The screens can be changed easily and not requiring special tools and devices
  • Customized screen size and shape available
  • Optional double layer screen available for remove undersize media
  • Optional media and component rinsing device

I. Outline drawing and basic parameters

1. Outline drawing

1. Electric cabinet, 2. Overturning handle, 3. Grinding bucket, 4. Locking handle, 5. Basement

2. Basic parameters

Basic parametersLDG 50
Volume of the grinding bucket50L
Useable volume25L
Power of the motor1.5kW  380V/220V/3phs /60hz
Revolutions of motor1500r/min
Revolutions of the revolving disc50-180r/min
Discharge methodDischarge by tilting 105 degrees
Discharge height280mm
Dimensions (L×W×H) mm1000×660×1120
Operation noise≤60dB
Weight of the machine300kg

II. Characteristics and applications of the polisher
1. As the newest high-efficient flow-type polisher, the machine is characterized by its beautiful appearance, reasonable structure, easy operation, great range of speed adjustment, flexible overturning, large angle of tilting, stable operation, very low noise, and high efficiency of grinding. It is able to solve the overlapping problems of the workpieces and grinding unevenly. The machine is particularly suitable for processing those small-sized workpieces with thicker oxide and larger burrs which are difficult to polish in vibratory polishers, but the flow-type polisher can give an ideal result within a short time in polishing such kind of workpieces and can increase the precision of the roughness by 2 grades, with the grinding efficiency being 10 times that of the vibratory polishers and 20 times that of the rolling-bucket polishers.

2. The machine can be widely used to grind various metal, plastic, and ceramic workpieces, which have been processed by pressing, cutting, forging and heat treatment, for deburring, removing oxide, and polishing. It is especially a kind of ideal polishing equipment for the complicated and irregular parts and thin sheet parts that are easy to deform.

III. Structure and working principle

1. The machine consists mainly of the grinding bucket, the basement, and the electric cabinet (see the outline drawing).

1). Grinding bucket: The grinding bucket consists of the bottom revolving disc and the fixed polygonal grinding bucket which is lined with highly strong and wearable PU, thus it is very durable. The upper and lower parts of the fixed bucket can be used changeably, i.e. when the lower part is worn, the bucket can be set upside-down to transpose the upper and the lower parts and the bucket can be used again, thus increasing the service life of the machine. The bucket is connected with the motor and can be tilted laterally to 100 degrees to discharge the processed workpieces easily, and when the bucket is reset, it is locked by a locking device to keep the operation safe.

2). Basement: The basement is made up of steel plates welded together, the central part of it is the trough receiving water. During operation, the dirty water produced in cleaning can be discharged into the trough and then is drained out through the outlet at the bottom of the trough.

3). Electric control cabinet: The electric control cabinet is made of an enclosed cabinet that controls the operation of the machine by means of the buttons on the penal.

2. Working principle

When a Centrifugal Disc Finishing Machine is operated, the bottom disc revolves at a high speed and produces a centrifugal force which causes the parts to be processed and the abrasive pieces to rub against each other violently in the bucket, forming a spiral vortex flow which results in a spiral overturn and a high-speed revolving abrasion between the parts and the abrasive pieces, thus the parts to be processed can be deburred and polished evenly within a very short time, obtaining the ideal result.

IV. Electric system and its electrical circuit diagram

  1. Model LDG50 is driven by FVB series of motor with frequency control of speed. The motor revolution can be adjusted by means of the buttons on the control panel so that the rotation of the revolving disc may reach step-less speed change within the range of 50-180 revolutions to meet various revolution needs of different parts to be processed. The electric system is equipped with overload protection and in the case of overload, the power will be cut off automatically to prevent the machine from being damaged.
  2. For the electrical circuit diagram of the electric system see Fig.1.
    1. Installation

V. Installation and adjustment

1). The machine should be set on level cement ground with four feet on a solid support.

2). Test the motor winding, the magnetizing winding and the

speed-measuring winding with a 500 v. megohmmeter, the insulation resistance should be no less than 0.38 mega-ohm, otherwise, the windings should be dried.

3). Connect the machine to the electrical mains, the motor can turn in either direction and it must be earthed.

2. Adjustment

1). After a certain time of operation, check the horizontal clearance between the revolving bottom disc and the fixed bucket, it should be kept about 0.5 mm. If the clearance becomes larger than 0.5 mm because of wear, open the lid of the spindle and turn the adjusting screw clockwise to adjust the clearance to the proper value, then close the spindle lid and screw the locking bolt.

2). If the V-belt becomes too loose, it will slip, in this case, screw the adjusting bolt on the motor plate to adjust the belt to the proper tightness.

VI. Operation, use, and maintenance

1. Operation and use

1). Before starting the machine, check with a gauge less than 1mm whether the clearance between the revolving disc and the fixed bucket is proper and whether there are foreign substances jammed into the clearance. If there are, the foreign substances should be removed immediately. The tightness of the v-belt should also be checked.

2). Put in the workpieces and the abrasive granules by the ratio of 1:2, the total quantity of them should not exceed the limitation. Then put in the proper amount of grinding compound and water, the water should submerge the workpieces and the abrasive granules. Operation without water is banned absolutely. The weight of a single piece of the workpieces put in should not exceed 1kg, and its size should not be less than 2mm. No workpieces with sharp edges should be put in.

3). Before starting the motor the speed-adjusting knob must be set to zero, press the start button to start the motor, then turn the speed-adjusting knob to set to a proper speed. For rough process or smaller workpieces, the speed of 1000 revolutions/minute is selected, for fine process or larger workpieces, the speed of 500—800 revolutions/minute is selected. The speed-adjusting motor should not run at low speed for a long time.

4). If the water becomes dirty during grinding, the dirty water can be drained without stopping the machine by opening the drainage valve at the bottom of the grinding bucket, and then close the valve and add the proper amount of grinding compound and water. If polishing is needed, cleaning can be carried out continuously.

5). When the workpieces have been ground and polished, open the drainage valve to drain the dirty water and at the same time turn the speed-adjusting knob to zero, the machine is stopped, open the locking device and tilt the bucket laterally to 100 degrees to discharge the workpieces.

2. Maintenance

1). The workpieces should be degreased before processing to enhance efficiency and protect the PU lining.

2). Often check the clearance between the revolving disc and the fixed bucket, if there are foreign substances in it, remove them in time. Adjust the clearance three times every month.

3). After 500 hours of operation, the spindle should be lubricated with ZL-3 lime grease, the quantity of the grease being 30 grams.

4). If there are any strange noises during the operation and the noises last longer than 5 minutes, the machine should be stopped timely to check whether the bolts in any part of the machine get loose, and if some bearings are damaged, they must be replaced in time. The models of the spindle bearings are 6208-2Z and 6210-2Z.

Fig.1  Electrical circuit diagram (LDG50)

Table for electrical components (LDG50)

UFFrequency converter220V 4.2A1.5KWKMAC contactor3TB4017-0A9A220V
SA1Knob switchLAY3GreenHDPower signal lampAD11-22/40220V red
SA2Knob switchLAY3GreenLDOperation signal lampAD11-22/40220V green
FUFuseKT18-322AKTTime relayH3CRA8100-220V
QFAutomation switchEA33-10A10AMMotorY90L-41.5kW

Fig.2 Structure drawing for clearance adjustment of the revolving disc

1. Adjusting screw

2. Connecting sleeve (being connected into an integral whole with the revolving disc)

3. Spindle

4. Revolving disc

Adjusting method

After removing the locking bolt and the central cover, adjust part 1 (adjusting screw): to reduce the clearance, screw part 1 clockwise, it moves down, which will cause parts 2 and 4 to move up. If there is no clearance at the pitching-in between part 1 and part 2, put a steel washer on the top of part 3, the spindle, and then start adjusting (the inner diameter of the washer must be smaller than the diameter of the spindle).

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