Maintenance Information; Carbon Brushes - Dremel 4300 Operating/Safety Instructions Manual

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To aid you in determining the optimum
operational speed for differ ent materials and
different accessories, we have constructed a
series of tables that appear on pages 27–30.
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 hap pens
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
slight ly to get the optimum working speed.
Some rules of thumb in regard to speed:
1. Plastic and other materials that melt at low
temperatures should be cut at low speeds.
Use only Dremel

Maintenance Information

To avoid injury from unexpected starting or electrical shock, always
remove plug from wall outlet before performing service or cleaning.
Service
Preventive maintenance
pe r formed
unauthorized per so n nel may result in
misplacing of internal wires and
components which could cause serious
hazard. We recommend that all tool service
be performed by a Dremel Service Facility.

CARBON BRUSHES

The brushes and commutator in your tool
have been engineered for many hours of
dependable service.
In order to prepare your brushes for use, run
your tool at full speed for 5 minutes under no
load. This will properly "seat" your brushes,
which extends the life of both your brushes
and your tool.
To maintain peak efficiency of the motor, we
recommend every 40 - 50 hours the brush es
be examined. Only genuine Dremel replace -
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2. Polishing, buffing and cleaning with any
type of bristle brush must be done at
speeds not greater than 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 high speed. 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 performing as you think it
should. Perhaps you should be using a
different accessory, and perhaps an
adjustment in speed would solve the problem.
Let speed do the work!
Leaning on the tool does not help.
, high-performance accessories.
®
ment brushes specially designed for your tool
by
should be used.
MAINTENANCE OF REPLACEABLE
BRUSHES ON MODEL 4300
The brushes should be inspected frequently
when tools are used continuously. If your tool
runs spo rad ically, loses power, makes
unusual noises or runs at a reduced speed,
check the brushes.
tool in this condition
will permanently damage your tool.
Follow these steps to check/change the
rotary tool brushes:
1. With the power cord unplugged, place the
tool on a clean surface. Use the tool
wrench as a screwdriver to remove the
brush caps in a counter-clockwise
direction (Fig. 10).
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