Ratio LR400NM, Instructions Manual

33

4. OPERATING THE ON/OFF SWITCH (SEE 

FIG E, F)

Slide the on/off switch to the position marked ”I” 

to start the machine. (See Fig. E)

Slide it to the position marked “0” to stop it. (See 

Fig. F)

E

F

5. VARIABLE SPEED CONTROL (SEE FIG G)

With the variable speed control (1), the required 

speed can be selected (also while running).

The required speed is dependent on the material 

and is to be determined by a practical trial.

After longer periods of working at low speed, 

allow the machine to cool down by running it for 

approx. 3 minutes at maximum speed with no 

load.

G

6. USING THE SANDER (SEE FIG. H)

Guide your sander parallel to the working surface 

and move it in circles or in a cross pattern. Do 

not tilt the tool in order to avoid deep unwanted 

sanding marks. The amount of material removed 

is determined by the speed of the sanding disc 

and the grit size used. The speed of the sanding 

disc diminishes relative to the pressure applied 

to the tool. For faster removal, do not increase 

pressure on the tool, but use a coarser grit size.

H

7. SELECT THE RIGHT SAND PAPER

Selecting the correct grit of sandpaper is an 

extremely important decision that will allow you 

to achieve the best quality sanding finish.

Coarse grit will remove the most material and 

finer grit will give you the best finish in all sanding 

operations. The condition of the surface to be 

sanded will determine which grit will do the job.

If the surface is rough: 

Start with coarse grit (sold separately) and sand 

until the surface is uniform. Then use medium 

to remove any scratches left by the coarse grit. 

Then use finer grit (sold separately) for finishing 

the surface.

Note:

 Always continue sanding with each grit 

until the surface is uniform.

WORKING HINTS FOR 

YOUR SANDER

If your power tool becomes too hot, especially 

when used at low speed, set the speed to 

maximum and run it with no load for 2-3 minutes 

to cool the motor. Avoid prolonged usage at 

very low speeds. Always use sand paper that is 

suitable for the material you want to sand.

Always ensure the work-piece is firmly held or 

clamped to prevent movement.

Any movement of the material may affect the 

quality of the sanding finish.

Start your sander before sanding and turn it off 

only after you stop sanding. For the best results, 

sanding wood in the direction of the grain.

Do not start sanding without having the 

sandpaper fitted.

Do not allow the sandpaper to wear away it will 

damage the base-plate. The guarantee does not 

cover base-plate wear and tear.