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Dremel 7700 Manual

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14
COLLETS
The Dremel accessories available for the multitool come
with various shank sizes. Four size collets are available to
accommodate the different shank sizes. Collet sizes are
identified by the rings on the back of the collet.
PICTURE 3
L. 3,2 mm Collet without ring
M. 2,4 mm Collet with three rings
N. 1,6 mm Collet with two rings
O. 0,8 mm Collet with one ring
Always use the collet that matches the shank size of the accessory
you plan to use. Do not force a larger diameter shank into a smaller
collet.
CHANGING COLLETS
PICTURE 4
P. Shaft Lock Button
Q. Collet Wrench
R. To tighten
S. To loosen
T. Collet Nut
1. Press the shaft lock button, hold down and rotate the shaft
by hand until it engages the shaft. Do not engage the shaft
lock button while multitool is running.
2. With the shaft lock button engaged, loosen and remove the
collet nut. Use the collet wrench if necessary.
3. Remove the collet by pulling it free from the shaft.
4. Install the appropriate size collet fully into the shaft and
reinstall the collet nut finger tight. Do not fully tighten the
nut when there is no bit or accessory installed.
CHANGING ACCESSORIES
PICTURE 4
P. Shaft Lock Button
1. Press the shaft lock button and rotate the shaft by hand
until it engages the shaft lock. Do not engage the shaft lock
button while multitool is running.
2. With the shaft lock button engaged, loosen (do not remove)
the collet nut. Use the collet wrench if necessary.
3. Insert the bit or accessory shank fully into the collet.
4. With the shaft lock button engaged, finger tighten the collet
nut until the bit or accessory shank is gripped by the collet.
Use the collet wrench to secure the bit or accessory in the
collet.
NOTE: Be sure to read the instructions supplied with your Dremel
accessory for further information on its use.
Use only Dremel tested, high performance accessories.
USE
GETTING STARTED
The first step in using the multitool is to get the "feel" of it. Hold
it in your hand and feel its weight and balance. Feel the taper
of the housing. This taper permits the tool to be grasped much
like a pen or pencil. The unique softgrip on the nose allows for
added comfort and control during use.
Always hold the tool away from your face. Accessories can be
damaged during handling and can fly apart as they come up to
speed.
When holding tool, do not cover the ventilation openings with
your hand. Blocking the ventilation openings could cause the
motor to overheat.
IMPORTANT! Practice on scrap material first to see how the
tool’s high-speed action performs. Keep in mind that your
multitool will perform best by allowing the speed, along with
the correct Dremel accessory and attachment, to do the work
for you. Do not put pressure on the tool during use, if possible.
Instead, lower the spinning accessory lightly to the work surface
and allow it to touch the point at which you want to begin.
Concentrate on guiding the tool over the work using very little
pressure from your hand. Allow the accessory to do the work.
Usually it is better to make a series of passes with the tool
rather than to do the entire job with one pass. A gentle touch
gives the best control and reduces the chance of error.
For best control in close work, grip the multitool like a pencil
between your thumb and forefinger. PICTURE 6
The "golf" grip method is used for heavier operations such as
grinding or cutting. PICTURE 7
OPERATING SPEEDS
This tool is a high speed multitool. Its speed can be set to 10000
or 20000 min
-1
. Adjusting the speed to your project will give a
better end result. To achieve the best results when working with
different materials, set the speed control to suit the job. To select
the right speed for the accessory in use, practice with scrap
material first.
The 7,2V Ni-Cd multitool switch settings are marked on the
speed control switch.
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 low speeds. Low speed operation
(15000 min
-1
or less) is usually best for polishing operations
employing the felt polishing accessories. 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 settings. Higher speeds are better
for hardwoods, metals, glass and for drilling, carving, cutting,
routing, shaping and cutting dadoes or rabbets in wood.
Some guidelines regarding tool speed:
• 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 15000 min
-1
to prevent
damage to the brush and your material.
… 14 …


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