Handleiding Dremel 398 (pagina 12 van 76) (Frans, Spaans)

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Page 12

Electronic Feedback Circuitry (EFC)

Your tool is equipped with a internal electronic

feedback system that provides a "soft start", which

will reduce the stresses that occur from a high

torque start. The system also helps to keep the pre-

selected rotating speed virtually constant between

no-load and load conditions.

Set the speed indicator to fit the job; to achieve the

best job results when working with different mate-

rials, the speed of the Rotary Tool should be regu-

lated. Model 398 Rotary Tool has an integral speed

control.

An external speed control

should never be used with this

tool.

To select the right speed for each job, use a

practice piece of material. Vary speed to find the

best speed for the accessory you are using and the

job to be done.

NOTE: Speed is affected by voltage changes. A

reduced incoming voltage will slow the RPM of the

tool, especially at the lowest setting. If your tool

appears to be running slowly increase the speed

setting accordingly.

Digital Speed Selector Switch

Your rotary tool features a digital speed selector

switch which displays an L.C.D. reading of the tool’s

RPM. The speed can be selected from 5,000 RPM to

35,000 RPM in 1,000 RPM increments by simply

depressing the positive or negative buttons on the

switch.

TO TURN TOOL "ON": slide ON/OFF switch to the

"ON" position.

TO TURN TOOL "OFF": slide ON/OFF switch to the

"OFF" position.

TO INCREASE SPEED: depress button with + sign.

TO DECREASE SPEED: depress button with - sign.

Needs for Slower Speeds

Certain materials, however, (some plastics, for ex-

ample) require a relatively slow speed because at

high speed the friction of the accessory generates

heat and causes the plastic to melt.

Slow speeds (15,000 RPM or less) usually are best

for polishing operations employing the felt polishing

accessories. They may also be best for working on

delicate projects as “eggery” work, delicate wood

carving and fragile model parts. All brushing

applications require lower speeds to avoid wire

discharge from the holder.

Higher speeds are better for carving, cutting, routing,

shaping, cutting dadoes or rabbets in wood.

Hardwoods, metals and glass require high speed

operation, and drilling should also be done at high

speeds.

The point to remember is this: You can do the great

majority of work at its regular speed of 35,000 RPM.

But for certain materials and types of work, you need

slower speeds — which is the reason the variable

speed models were developed.

To aid you in determining the optimum operational

speed for different materials and different

accessories, we have constructed a series of tables

that appear on page 13, 14, and 15. By referring to

these tables, you can discover the recommended

speeds for each type of accessory. Look these tables

over and become familiar with them.

Ultimately, the best way to determine the correct

speed for work on any material is to practice for a

few minutes on a piece of scrap, even after referring

to the chart. You can quickly learn that a slower or

faster speed is more effective just by observing what

happens as you make a pass or two at different

speeds. When working with plastic, for example,

start at a slow rate of speed and increase the speed

until you observe that the plastic is melting at the

point of contact. Then reduce the speed slightly to

get the optimum working speed.

Some rules of thumb in regard to speed:

1. Plastic and materials that melt at low

temperatures should be cut at low speeds.

2. Polishing, buffing and cleaning with a wire brush

must be done at speeds below 15,000 RPM to

prevent damage to the brush.

3. Wood should be cut at high speed.

4. Iron or steel should be cut at top speed if using

tungsten carbide accessory, but at slower speeds

if using high speed steel cutters. If a high speed

steel cutter starts to chatter — this normally

means it is running too slow.

5. Aluminum, copper alloys, lead alloys, zinc alloys

and tin may be cut at various speeds, depending

on the type of cutting being done. Use paraffin or

other suitable lubricant on the cutter to prevent

the cut material from adhering to the cutter teeth.

Increasing the pressure on the tool is not the answer

when it is not cutting as you think it should. Perhaps

you should be using a different cutter, and perhaps

an adjustment in speed would solve the problem. But

leaning on the tool seldom helps.

Operating Speeds for Accessories

Use only Dremel Tested, High Performance Accessories.

CAUTION

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