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Lapping Machine 26 inches


1.Application :

This machine is designed for lapping and polishing of high-precision flat surface. Such as

mechanical seal rings, new ceramic grinding plates, hydraulic oil pump accessories, etc.

By using different lapping

discs and polishing liquid, aluminum, copper, iron, carbide, engineering plastic, alumina

and silicon carbide can also be lapped.

2.Structure & Features:

Features: Equipped With pneumatic cylinder,easy adjustment and operation; Also equipped

with an automatic & timed lapping fluid  adding device; Adapting three-phase converter to

achieve variable speed change;Using worm gear reducer. Advantages: Small size, high

efficiency, stable operation, low noise,long life. It is  suitable choice for lapping and polishing

medium-sized seal rings. The polishing disc diameter φ650, which can lap rings with diameter

of φ240mm  maximum.

3.Main Technical Parameters :

1.   Motor: 2.2KW ;1430 rpm (with 3kw converter)

2.   Polishing plate size: 650mm x 150mm (Outer diameter x inner diameter)

3.   The maximum diameter can be lapped: 240mm

4.   The thinnest  thickness can be lapped: 1mm

5.  Flatness(after being polished): 0.0006mm. Roughness: Ra 0.05μm

6.  Machine Dimension: 900mm x 1100mm x 1900mm (length x width x height)

7.  Machine Weight: 1600Kg

4.Installation :

Placed on a flat solid concrete floor, calibrated with a spirit level

5.Operation and precautions :

1.  Clean the worktable , dead wights and conditioning rings.

2.  Clean the workpiece to avoid inclusion of debris.

3.  Discharge the workpiece in 3 conditioning rings, leaving Ø30mm-Ø60mm space in the middle.

Switch on the air supply and set the total air inlet pressure to 0.3-0.4Mpa. Pressurization and

set the air pressure to 0.05-0.2 Mpa (pressurizing 0.1 Mpa is equivalent to applying 20 kg

pressure to the workpiece). The lapping  fluid pressure is set to 0.02-0.04 Mpa.

4.Turn on the power, start the machine, set a reasonable polishing time. Set the time for

adding the polishing liquid (usually 5 seconds spraying every 1 minute).

5. After work, be sure to take the conditioning ring and the workpiece out of the machine. It is

forbidden to keep them on the lapping plate overnight to prevent rust from corroding the

grinding disc and damage the converter when restart.

6. The machine tool should be always kept clean and tidy . Clean inspection should be conducted

when the shift is over. Before the holiday, countertops and some other major parts should

be protected against rust.

7. The machine should be operated by skilled personnel only.

8. Only professional maintenance personnel can carry out maintenance, and it is strictly forbidden

to install and disassemble the machine and change any spare parts of the machine.

6.Refueling lubrication:

Use 46# gear oil for turbine box, change oil once after the maching is running for 100 hours.

Afterward,  change the oil every 6 months. The oil level should be maintained at 1/3 or more.

7.Trim polishing plate:

After the disc is worn out, it must be machined on the lathe and then trimmed. The emery or

white steel jade sand, brown steel jade sand, and  green silicon carbide sand are used for the

repair. Sand particle size generally between 100-200 meshes. Trim the polishing plate with

a trimming ring. When the polishing plate is convex, the trimming ring moves towards the center;

Otherwise it moves outwards; If it is wavy, then one ring moves towards the center, one ring

moves to the outside and the other ring remains in place. The trimming ring movement generally

does not exceed 5mm.

8.Defect analysis and troubleshooting

Possible Problem:Scratch

Possible Causes:1.Scraps of the workpiece. 2.Coarse sand is mixed in polishing liquid.

Solutions: 1.Clean workpiece 2. Change polishing liquid 3. Trim polishing plate

Possible Problems:Not Shinning enough

Possible Causes:1.Quality of Abrasive paste is poor 2.Workpiece is green. 3.Plate line on

Table-board is shallow 4. Polishing time is too short

Solutions:1.Change abrasive paste 2.Change workpiece 3.Adding plate line 4.Set an

reasonable polishing time

Possible Problems:Poor flatness

Possible Causes:1.Table board is uneven 2.Polishing time is too short.

Solutions:Trim polishing plate 2.Prolong Polishign time

Possible Problems:Machine can not be started

Possible Causes:phase error of motor

Solutions:Change the connection phase


1) 3 pieces of conditioning rings.       2) 6 pieces of Isolation panels.       3) 1 piece of hex wrench.

Weight & Dimensions:

Gross Weigjt– 686 KGS APPROX

Dimensions :  L 111.8 x W 111.8 x H 106.7 CMS APPROX


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