Dremel VRT1 Consignes De Sécurité/D'utilisation page 12

Operating Speeds
Needs for Slower Speeds
Certain materials, however, (some plastics and
precious metals, for ex ample) require a relatively
slow speed because at high speed the friction of
the accessory generates heat and may cause
damage to the material.
Slow speeds usually are best for polishing
operations employing the felt polishing ac ces -
sories. They may also be best for working on
deli cate projects as "eggery" work, delicate wood
carving and fragile model parts.
Higher speeds are better for carving, cutting,
routing, or shaping in wood.
Hardwoods and glass require high speed
operation, and drilling should also be done at
high speeds.
The point to remember is this: Many applications
and accessories in our line will provide the best
performance at full speed, but for certain
materials, applications, and accessories, you
need slower speeds, which is the reason our
variable speed models are available.
Ultimately, 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 chart. You can quickly learn that
a slower or faster speed is more effective just by
observing what hap pens as you make a pass or
two at different speeds. When working with
plastic, for example, start at a slow rate of speed
and increase the speed until you observe that
the plastic is melting at the point of contact.
Then reduce the speed slight ly to get the
optimum working speed.
Some rules of thumb in regard to speed:
1. Plastic and other materials that melt at low
temperatures should be cut at low speeds.
2. Polishing and buffing must be done at low
speeds.
3. Wood should be cut at high speed.
Increasing the pressure on the tool is not the
answer when it is not performing as you think it
should. Perhaps you should be using a different
accessory, and perhaps an adjustment in speed
would solve the problem. Leaning on the tool
does not help.
Let speed do the work!
Maintenance
Service
Preventive maintenance pe r -
formed by unauthorized per -
WARNING
so n nel may result in misplacing of internal
12
wires and components which could cause
serious hazard. We recommend that all tool
service be performed by a Dremel Service
Facility.
BEARINGS
Model VRT1has ball bearing construction.
Under normal use no additional lubrication is
required.
Cleaning
To avoid accidents always
disconnect the tool from
WARNING
vacuum hose before cleaning or performing
any maintenance. The tool may be cleaned
most effectively with com pressed dry air.
Always wear safety goggles when cleaning
tools with compressed air.
Ventilation openings and switch levers must be
kept clean and free of foreign matter. Do not
attempt to clean by inserting pointed objects
through opening.
Certain cleaning agents and
solvents damage plastic parts.
CAUTION
Some of these are: gasoline, car bon
tetrachloride, chlorinated cleaning solvents,
ammonia and household detergents that contain
ammonia.