Silverline 127569 Manual Download

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Intended Use

Electric drill bit sharpener with concealed grinding wheel, for sharpening
HSS and carbon steel twist drill bits.

Unpacking Your Tool

• Carefully unpack and inspect your tool. Familiarise yourself with all its

features and functions

• Ensure that all parts of the tool are present and in good condition. If

any parts are missing or damaged, have such parts replaced before
attempting to use this tool

Before Use

WARNING:

ALWAYS handle drill bits with care and avoid touching the

cutting edges. Burrs and sharp edges may cause deep skin cuts. Drill bits
become hot during sharpening, and can cause severe burns.

WARNING:

This tool is suitable for sharpening twist drill bits ONLY. Masonry,

lip and spur, auger, flat and step drill bits and router cutters can NOT be
sharpened with this device.
• Place the sharpener on a sturdy, even surface and connect the plug to

the power supply

• Clean drill bits prior to sharpening, to remove dirt, grease and cutting

fluids. Drill bits must be completely dry

Operation

WARNING:

ALWAYS use adequate protective equipment, including eye

protection, respiratory and hearing protection, as well as suitable gloves,
when working with this tool.

Switching on and off

1. Connect the plug to the power supply
2. Toggle the On/Off Switch (1) to the ‘I’ position, to start the machine
3. Toggle the On/Off Switch to the ‘O’ position, to stop the machine

WARNING:

Always disconnect from the power supply after use.

Duty cycle

WARNING:

This product has a duty cycle of 20%.

• After every 2 minutes of use, it must be allowed to cool down for 8

minutes, before continuing with another max. 2 minutes continuous use

• The product is equipped with a thermal cut-out device to protect the

motor

• If the tool cuts out, the duty cycle has been exceeded. Turn off the tool

and allow the motor to cool down fully. You will then be able to proceed,
using the tool in accordance with the 20% duty cycle

Sharpening drill bits

WARNING:

The drill bit becomes very hot whilst sharpening: DO NOT touch

the tip.

1. Match the size of the drill bit with one of the holes in the head of the

sharpener

2. Switch the machine on (see

‘Switching on and off’)

3. Insert the drill bit into the

appropriate hole (see Fig. A)

4. Exert slight downward pressure

on to the drill bit, and move it
back and forth by about 20° for a
duration of about 20 seconds

5. Remove the drill bit from the

machine, and switch the device off

6. Examine the drill bit, to check

whether it has become too
hot during sharpening (see
‘Troubleshooting’). Consider
adjusting the grinding wheel
height, if the sharpening result is
not satisfactory (see ‘Adjusting
the grinding wheel’)

7. Repeat steps 1-6 to sharpen the

other side of the bit. Use the same
technique, downward pressure
and amount of time to achieve an
even sharpening result

8. Examine the drill bit and ensure

that both cutting edges are evenly
proportioned and shaped, the point
is centered and that the trailing
edge is free of burrs (see Fig. B)

9. Repeat steps 1-8 as required

Note:

Use a bench grinder first, to

roughly shape the drill bit, if sharpening
a broken-off or very dull bit.

Adjusting the grinding wheel

Note:

Depending on the drill bit you may need to adjust the height of the

grinding wheel.

1. Turn the Adjustment Dial (3) clockwise to raise the grinding wheel

• Raising the grinding wheel will lead to a more aggressive cutting action
• When sharpening short drill bits, it may be necessary to raise the

grinding wheel
2. Turn the Adjustment Dial (3) anticlockwise to lower the grinding wheel

•  Lowering the grinding wheel will lead to a finer ground edge
•  Fine grinding may take longer and can require additional repetitions
•  When sharpening long drill bits, it may be necessary to lower the grinding

wheel

Accessories

• Replacement grinding wheels (product code 128975) are available from

your Silverline stockist

Maintenance

WARNING:

ALWAYS ensure that the tool is disconnected from the power

supply, before cleaning, changing accessories, or carrying out maintenance.

General inspection

• Regularly check that all the fixing screws are tight. They may vibrate

loose over time

• Inspect the supply cord of the tool, prior to each use, for damage or wear.