Nakanishi PRESTO II Operation Manual

8 . REPLACEMENT OR CLEANING PROCEDURES OF CHUCK
CAUTION
As the guide-bush is a very small part, be careful not to lose it.
NOTICE
Remove the chuck and clean once a week.
8 - 1 Removal of Chuck
① Remove the cartridge with a bur or dummy bur installed.
(7. REPLACEMENT OF CARTRIDGE)
② Hold the rotor with two fingers as shown on the Fig.11.
Mount the wrench provided on the rotor nut located on the top of rotor shaft and
turn counterclockwise. (Either side of wrench can be used.)
③ When the rotor nut is loose. Push out the chuck carefully with a dummy bur or the
bur shank from the back of the cartridge, the Guide-bush and the chuck will come
out. (Fig.12)
・ When cleaning the chuck, clean it with ultrasonic cleaner etc.
Spray oil to the inside of the rotor shaft and clean thoroughly.
8 - 2 Installation of a New Chuck
① Apply oil thinly on the surface of the new chuck or the chuck after cleaning, insert the test bur and push into the rotor shaft.
(Fig.13)
② Set the longer one of the guides of the guide bushings on the end of the rotor shaft along the test bur. (Fig.14)
③ Finally insert the rotor shaft nut along the test bur, and tighten firmly with a wrench while holding the rotor. (Fig.15)
Test bur
Chuck
Fig. 13
9 . MAINTENANCE OF UNIT
9 - 1 Draining the Filter
Check the filter bowl from the filter inspection window, and if there is an accumulation
of water, insert fingers from the bottom, and turn the drain valve in the direction of the
arrow (counterclockwise) to drain water from the filter. (Fig. 16)
After draining, securely tighten the drain valve by turning it in the reverse direction.
Fig. 11
Test Bur
Test Bur Chuck Guide-bush
Fig. 12
Rotor Shaft Nut
Guide-bush
Fig. 14 Fig. 15
Fig. 16
2012.09.20 002 S
PRESTO
OPERATION MANUAL
Thank you for purchasing the PRESTO .
Please read this manual carefully, and store it in a place where it can be easily accessed for future reference.
1 . CAUTIONS FOR HANDLING AND OPERATION
■ Read these warnings and cautions carefully and only use in the manner intended.
■ These warnings and cautions are intended to avoid potential hazards that could result in personal injury or damage to the
device. These are classified as follows in accordance with the seriousness of the risk.
Class
A safety hazard could result in bodily injury or damage to the device if the safety
WARNING
instructions are not properly followed.
A hazard that could result in light or moderate bodily injury or damage to the
CAUTION
device if the safety instructions are not followed.
WARNING
① Do not touch the cutting tool while it is running.
② Use a protective cover, glasses and / or facemask for your safety during rotation.
③ Do not drop or hit the attachment because the shock can damage internal components.
④ Do not force or bend the cutting tool. The shank might be broken and / or bent.
⑤ Check if the collet chuck has been tightened firmly before operation.
⑥ Observe the permissible speeds the manufacturer or dealer designates for the bur. Otherwise, you may be
injured by scattering and breaking up of the bur.
⑦ Do not use burs which are oscillating or bent or damaged and of which shank portions are worn.
Otherwise, you may be injured by scattering and breaking up of the bur.
CAUTION
① Do not modify or disassemble unnecessarily, performance and safety may be seriously affected.
② Do not drop the handpiece and unit. Make sure to put the unit on a horizontal and stable surface.
③ Do not turn the chuck release ring during rotation of the handpiece. Otherwise, the handpiece will be broken.
④ Never supply lubricant to the handpiece. It uses grease filled bearings and additional lubrication may
cause failures.
⑤ Pay careful attention to rattling, vibration, sounds and temperature (heating), and inspect by rotating in
advance before starting use. Immediately ask dealers for repair work if any irregularities are sensed.
⑥ The proper air pressure is 0.2 ∼ 0.25MPa. Pressure exceeding the value may lead to premature failure of
the bearings because of excessive speeds.
⑦ Extract water if water drips or contaminants are found on the filter of the unit.
⑧ Always clean the shank of the bur you are going to mount. Contaminant deposits in the chuck may lead to
oscillating of the bur and break the chuck.
⑨ Install the cutting bur or test bur when not in use.
⑩ Operational control, maintenance and inspection is the responsibility of each user.
OM-K0516E
Degree of Risk
Rev.A