NUTOOL BT150 Manual Del Usaurio página 14

COMPONENTS AND CONTROLS (PIC.1)
1 Grinder Assembly
2* Grinder eye shield c/w mounting bracket
3 Grinder work rest
4 ON / OFF Switch
5 Eye shield securing screw
6 Wheel guard securing bolts x 3
7 Work rest securing bolts
8 Mounting holes (1 at each corner)
BENCH GRINDER ASSEMBLY
To fit the eye shields remove screw 5 (Pic.1). Locate the screw
through the slot in the eye shield and hole on the grinding wheel
guard and finger tighten. Position the eye shield so it does not
come in to contact with the grinding wheel. Tighten the screw to
secure the eye shield in place. Attach the tool rests using the
bolts provided and adjust to the correct position. Loosen bolts
7 (Pic.1) and adjust the gap between the tool rest and grinding
wheel to 3mm (Pic.2).
BENCH GRINDER MOUNTING TO A BENCH
The Grinder can be secured with screws or nuts and bolts.
Locate the mounting holes 8 (Pic.1) . The length of the bolts or
screws will depend on the thickness of the bench. Where a steel
bench is used it is best to mount the grinder on to a board, then
attach the board to the bench, this will also minimise vibration.
STARTING & STOPPING
Before connecting to the power supply rotate the wheel by hand
to ensure that it is running free from obstruction. Connect to the
mains supply and press the rocker switch to the ON position
(l).
To stop the machine simply press the rocker switch to the OFF
position (o).
Warning!
After switching OFF the grinding wheel will continue to rotate
for some time.
GRINDING WHEEL DRESSING
During the grinding operation the grinding wheel surface can
become glazed and clogged with metal particles and lose
their shape. Dressing the grinding wheel will open up the grain
structure and improve the grinding operation it will also restore
the shape of the grinding wheel. Dressing the grinding wheel is
done with either a dressing stick, dressing wheel or diamond
dressing tool. All three types of dressing tools are available from
your tool store. Regular dressing of the grinding wheels will
improve the grinding operation and reduce vibration.
We recommend the purchase of a publication on good grinding
practice for more information on Grinding which will cover wheel
dressing in more detail.
CHANGING THE GRINDING WHEEL (PIC.3 TO 7)
Switch off the grinder and isolate from the mains supply. Wait
for the grinding wheel to become stationary. Remove the wheel
guard by removing the 3 fixing bolts and nuts (Pic.3). Remove
the side guard to expose the grinding wheel and securing nut
(Pic.4). Hold the other wheel firmly, usually hand pressure
should be sufficient (but it may be required to jam the wheel
with a small piece of wood). Unscrew and remove the locking
nut (Pic.5) with a suitable sized wrench remove the outer flange.
Remove the grinding wheel and the inner flange (Pic.6) Inspect
the two paper washers and replace if necessary.
Ensure that the inner and outer flanges are clean and remove
any remains of the paper washers.
Clean the motor shaft and ensure that the threads are clean and
free from grinding dust.
Pic. 7 shows the correct alignment and sequence of
components.
1. Securing nut
2. Outer flange
3. Outer paper washer
4. Grinding wheel
5. Inner paper washer
6. Inner flange
Fit the replacement grinding wheel (available from your Stockist)
and repeat the above procedure in reverse order. The direction
of the threads on the bench grinder shaft will be determined,
by, which side of the bench grinder the wheel is mounted. If the
Wheel is mounted on the left of the bench grinder the direction
of the thread will be a left hand thread. To unscrew turn in a
clockwise direction. If the wheel is mounted on the right of the
bench grinder the direction of the thread will be a right hand
thread. To unscrew turn in an anti clockwise direction.
Note: When used in an industrial environment grinding wheel
and sanding belt should only be fitted by a fully qualified person.
Replacement wheels are available from your local stockist.
GRINDING WHEEL INFORMATION
The following information is a guide only on the different types of
grinding wheels and their uses.
TYPES OF ABRASIVE GRAIN
Grinding wheels are made of four main types of abrasive grain:
aluminium oxide, silicon carbide, CBN (cubic boron nitride and
diamond. In the home workshop you will probably only use
wheels of aluminium oxide or silicon carbide. Both types are
available from your tool stockist.
Grain size is separated into four main categories: course,
medium, fine and very fine.
Table 1 shows the breakdown of grain size in each category.
You will probably never need a coarse wheel. For most work a
medium or fine wheel is recommended.
19
GB