Proxxon Micromot 230/E Manual page 8

5.1 Adjusting the operational tools (Fig. 2)
A collet chuck suitable for a shaft diameter of
2.4 mm is fi tted ex works to the spindle collet
holder. This is the preferred diameter for Prox-
xon operational tools.
Always ensure that the correct collet is used
corresponding to the shaft diameter! Never use
operational tools with a shaft diameter which does
not correspond to the inside diameter of the collet!
Do not tighten the sleeve nut if a collet without
an operational tool is inserted in the spindle!
All operational tools should be clamped as short
as possible. Excessively protruding shafts can
bend easily and contribute to poor concentricity.
Caution:
Disconnect the mains plug!
1. Press the lock button 1
2. Rotate the spindle with the sleeve nut 2
slightly while pressing the lock button
simultaneously until it engages in the
depression on the spindle.
3. Loosen the sleeve nut
4. Remove the operational tool 3 if necessary
and insert a new one in the collet hole
5. Tighten the sleeve nut 2 while depressing
the lock button.
5.2 Changing the collets (Fig. 3):
Caution:
Disconnect the mains plug!
1. Press the lock button 1
2. Rotate the spindle with the sleeve nut 2
slightly while pressing the lock button
simultaneously until it engages in the
depression on the spindle.
3. Unscrew the sleeve nut 2
4. Replace the collet 3
5. Screw on the sleeve nut while depressing
the lock button.
5.3 Working with the device
Caution:
Never work without safety glasses.
Do not work with damaged grinding disks
or bent shafts.
Please note:
A correct and uniform speed achieves a high grin-
ding performance, not excessive contact pressure.
The following rule of thumb governs selection
of the speed:
Small milling cutters / pins = high speed,
large milling cutters / pins = low speed.
Caution:
Secure the workpiece during work!
In addition to enabling more pleasant and
effi cient working, this also reduces the risk of the
workpiece fl ying about! Please note: A workpiece
fl ying out can cause injuries! Use a vice or
suitable clamping fi xture to hold the workpiece!
Warning:
It is imperative that electric tool recoil be
avoided!
Factors such as
• the incorrect speed for the work in hand
• selection of the wrong operational tool
• excessive contact pressure
• incorrectly clamped tools
• carelessness during work
can cause the operational tool to seize, catch
and block. The reaction torque may result in an
uncontrolled acceleration of the electric tool or
workpiece in this context which may pose a risk
to the person operating the tool! It is imperative
that this operating condition be avoided. Please
note that operational tools can break, and their
parts fl ying about represent a risk! Risk of injury!
Selecting the speed:
A correct and uniform speed achieves a high
grinding performance, not excessive contact
pressure.
The following rule of thumb governs selection
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