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11
OPERATION (CONTINUED)
Operating Speeds
To achieve the best results when working
with different materials, set the variable
speed control to suit the job. To select the
right speed for the accessory in use, practice
with scrap material first.
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
. The tool may not start at the
lowest switch setting in areas where outlet voltage
is less than 120 volts. Simply move the speed set-
ting to a higher position to begin operation.
The 300 Series Rotary Tool switch settings
are marked “near” the speed control switch
on the front tool label. Refer to the Speed
Settings chart on pages 12 thru 14 to help
determine the proper speed for the material
being worked on and the accessory to use.
Most jobs can be accomplished using the
tool at the highest setting. However, certain
materials (some plastics and metals) can be
damaged by high-speed generated heat and
should be worked on at relatively slow
speeds.
Slow speed operation (15,000 RPM or less)
is usually best for polishing operations
employing the felt polishing accessories, del-
icate wood carving and fragile model parts.
All brushing applications require lower
speeds to avoid wire discharge from the
holder. Let the performance of the tool do the
work for you when using lower speed set-
tings.
Higher speeds are better for drilling, carving,
cutting, routing, shaping, cutting dadoes or
rabbets in wood. Hardwoods, metals and
glass require high speed operation also.
The settings for approximate RPM’s are:
Switch Setting Speed Range RPM
1-2 10,000-14,000
3-4 15,000-19,000
5-6 20,000-24,000
7-8
25,000-29,000
9-10
30,000-37,000
Some guidelines regarding tool speed:
• There is no accessory for the Dremel
Rotary tool that will drill or cut glass.
• Plastic and other materials that melt at low
temperatures should be cut at low speeds.
• Polishing, buffing and cleaning with a wire
brush must be done at speeds not greater
than 15,000 RPM to prevent damage to the
brush and your material.
• Wood should be cut at high speed.
• Iron or steel should be cut at high speed.
• If a high speed steel cutter starts to vibrate,
it usually indicates that it is running too
slow.
• Aluminum, copper alloys, lead alloys, zinc
alloys and tin may be cut at various
speeds, depending on the type of cutting
being done. Use a paraffin (not water) or
other suitable lubricant on the cutter to pre-
vent the cut material from adhering to the
cutter teeth.
NOTE: Increasing pressure on the tool is not
the answer when it is not performing proper-
ly. Try a different accessory or speed setting
to achieve the desired result. Please refer to
the following Speed Setting charts or simply
contact Dremel Consumer Service at:
Phone: 03-5415317
Fax: 03-5415441
or at www.Dremel.com.
Set the Speed Control to the desired setting.
O
n/Off Switch
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