Manual DeWalt D21620 (page 31 of 132) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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ENGLISH

5. Slowly feed the accessory into the workpiece

using the feed handle (e).

6. At the start of the cut, apply light pressure to

allow the accessory to perform the initial groove.

7. Continue applying sufficient pressure to achieve

a smooth progressive cut. Do not force.

8. The pressure exerted on the handle is too high if

the stand comes loose from the work surface.

9. Take extra care when the accessory is about to

break through the surface to prevent splintering.

10. Always turn off the motor, the magnet and the

power, in that particular order, when work is

finished and before unplugging.

Drilling with Annular Cutters

Annular cutters only cut material at the periphery of

the hole, rather than converting the entire hole to

shavings. As a result, the energy required to make a

hole is lower than for a twist drill.

When drilling with an annular cutter, it is not

necessary to drill a pilot hole.

WARNING: Do not touch the cutter or

the parts close to the cutter immediately

after operation, as they may be

extremely hot and cause burns to the

skin.

Ensure nobody is in the work area

where the metal core is ejected.

Drilling Conditions

The ease with which material can be drilled depends

on several factors including tensile strength and

abrasion resistance. Whilst hardness and/or strength

is the usual criterion, wide variations in machineability

can exist among material showing similar physical

properties.

The drilling conditions are dependent on

requirements for tool life and surface finish. These

conditions are further restricted by the rigidity of the

tool and the workpiece, lubrication and machine

power available. The harder the material, the lower

the cutting speed.

Some materials of low hardness contain abrasive

substances leading to rapid cutting edge wear at

high speeds. Feed rates are governed by rigidity of

set-up, volume of material to be removed, surface

finish and available machine power.

MAINTENANCE

Your DEWALT power tool has been designed to

operate over a long period of time with a minimum

of maintenance. Continuous satisfactory operation

depends upon proper tool care and regular cleaning.

WARNING: To reduce the risk of

injury, turn unit off and disconnect

machine from power source before

installing and removing accessories,

before adjusting or changing

set- ups or when making repairs. Be

sure the switch is in the OFF position.

An accidental start-up can cause injury.

Pop-off Brushes

After 80 hours, the motor will be automatically shut

off indicating that the carbon brushes are nearly

worn out and that the tool needs servicing. The

carbon brushes are not user-serviceable. Take the

tool to an authorised DEWALT repair agent.

Lubrication

IN HORIZONTAL APPLICATIONS

• Adjust the fluid flow as required using the flow

regulator (v) (fig. 4).

• Add more cutting fluid if the shavings become

blue.

VERTICAL AND OVERHEAD APPLICATIONS

Dip the cutter in cutting paste or apply an

appropriate spray.

LUBRICATING THE FEED TRAVEL (FIG. 9)

The feed travel should be lubricated periodically with

grease to ensure smooth operation.

• Raise the motor unit to the highest position

possible.

• Lubricate the dove-tail guide way (gg) at both

sides.

• Lubricate the gear rack (hh).

After repeated use, the gear rack may become

loose. If necessary, adjust the 5 self-locking set

screws at the left side. Tighten screws in series until

the gear rack moves freely in the dove-tail guide but

does not allow the motor to wobble.

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DeWalt D21620 Manual

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