Ryobi EHT150V Manuel D'utilisation page 10

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with the provided wrench until the accessory shank is
gripped by the collet. Avoid excessive tightening of the
collet nut.
REMOVING ACCESSORIES
See Figure 4–5.
 Unplug the tool.
 With the spindle lock engaged, loosen the collet nut
with the provided wrench.
 Remove the accessory. If still cannot be removed,
push the accessory back into the collet nut, then
loosen and remove it.
USING MANDRELS
See Figure 6–8.
The most common types of mandrel to use with this tool
are the standard mandrel which is used with cut-off discs,
grinding wheels, emery wheels, and cut-off wheels. Screw
mandrels are used with polishing wheels and polishing
drums. Drum mandrels are used with sanding drums.
To install:
 Unplug the tool.
 Install the mandrel.
If using the standard mandrel:
 Press and hold the spindle lock.
 Insert the slot end of the provided wrench into the slot
on top of the mandrel and unscrew.
 Remove mandrel screw and washer.
 Place desired accessory over mandrel shaft and align
accessory hole with mandrel hole.
 Insert mandrel screw with washer through the
accessory and mandrel shaft holes.
NOTE: The mandrel washer should be placed between
the mandrel screw and the accessory.
 Tighten using provided wrench.
If using the screw mandrel:
 Align desired accessory hole with mandrel screw
head.
 Screw accessory onto mandrel by twisting clockwise
until secure.
If using the drum mandrel:
 Align appropriately sized sanding drum over mandrel
and push down to completely cover drum end of
mandrel.
NOTE: If necessary, tighten the screw on the drum
mandrel head to expand the drum and securely hold the
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sanding drum in place.
BALANCING ACCESSORIES
For precision work, it is important that all accessories
be properly balanced. To balance an accessory, slightly
loosen the collet nut and give the accessory or collet a
6.35 mm (1/4 in) turn. You should be able to tell by the
sound and feel if the accessory is running in balance.
Continue adjusting in this fashion until the best balance is
achieved. Replace accessories if they become damaged
or unbalanced.
SELECTING THE RIGHT SPEED
See Figure 9.
The rotary tool has a speed range of 10,000 to 35,000
RPM. To select the right speed for each job, use a practice
piece of material. Vary speed to fi nd the best speed for the
accessory you are using and the job to be done.
Use the indicator mark above the speed control dial to
set the best speed for the job. The speed control dial is
numbered 1 to 5 and MAX. For example, a speed setting
of 1 is approximately 10,000 RPM, and a speed setting of
MAX is approximately 35,000 RPM.
Refer to the speed dial settings table to determine the
proper speed based on the material being worked and the
type of accessory being used.
SLOWER SPEEDS
Certain materials, some plastics for example, require
a relatively slow speed because the friction of the tool
generates heat and causes the plastic to melt at high
speed.
Slow speeds (15,000 RPM or less) are usually best for
polishing operations using the polishing accessories. They
may also be best for working on delicate projects, delicate
wood carving, and fragile model parts.
Higher speeds are better for carving, cutting, and shaping
wood. Hardwoods, metals, and glass require high speed
operation. Drilling should also be done at high speeds.
To determine the optimum operational speed for different
materials and accessories, refer to the speed dial settings
table. Look this table over and become familiar with it.
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 table. You can quickly
learn whether a slower or faster speed is more effective
just by observing what happens when you make a pass or
two at different speeds.
When working with a scrap piece of plastic, start from
a slow rate of speed and increase the speed until you
observe the plastic is melting at the point of contact;
reduce the speed slightly to get optimum working speed
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