Ryobi HT232, Operator'S Manual

Page: 9 / 36

9 - English
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, on the next page,
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, on the next page. 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 that 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 at a slow
rate of speed and increase the speed until you observe
whether the plastic is melting at the point of contact; reduce
the speed slightly to get optimum working speed without
melting the workpiece.
NOTE:

Plastic and materials that could melt at low temperatures
should be cut at low speeds.

Soft wood should be cut at high speed.

Aluminum, tin, and copper, lead, and zinc alloys may be
cut at any speed, 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.
OPERATION
USING MANDRELS
See Figures 6 - 8, page 13.
The most common types of mandrel to use with 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 mandrel are used with sanding drums.
To install:

Unplug the rotary 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 appropriate 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
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 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, page 13.
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 find the best speed for the accessory
you are using and the job to be done.