Nakanishi PRESTO II Operation Manual

9. REPLACEMENT OF CARTRIDGE
① Fit the cartridge wrench supplied with the handpiece to the Àats on the handpiece
nose. Turn the cartridge wrench as shown in (Fig.10) after it is loosened, unscrew
the nose with ¿ngers and remove from the handpiece.
② Before inserting a new cartridge, clean the head interior.
③ Finally, securely tighten the cartridge by turning it in the reverse direction to
removal.
10. 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.
10 - 1 Removal of Chuck
① Remove the cartridge with a bur or dummy bur installed.
(9. REPLACEMENT OF CARTRIDGE)
② Hold the rotor with two ¿ngers 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.
10 - 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 ¿rmly with a wrench while holding the rotor (Fig.15).
Test bur
Chuck
Fig. 13
11. MAINTENANCE OF UNIT
11 - 1 Draining the Filter
Check the ¿lter bowl from the ¿lter inspection window, and if there is an accumulation
of water, insert ¿ngers from the bottom, and turn the drain valve in the direction of the
arrow (counterclockwise) to drain water from the ¿lter (Fig. 16).
After draining, securely tighten the drain valve by turning it in the reverse direction.
12. DISPOSAL OF THE PRESTO
When disposal of a PRESTO is necessary, follow the instructions from your local government agency for proper disposal of
industrial components.
Contents are subject to change without notice.
Fig. 10
Fig. 11
Test Bur Chuck Guide-bush
Fig. 12
Rotor Shaft Nut
Guide-bush
Fig. 14 Fig. 15
Fig. 16
2015 . 01 . 20 002
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 to the operator or
damage to the device. These are classi¿ed 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
WARNING
the safety instructions are not properly followed.
Test Bur
A hazard that could result in light or moderate bodily injury or damage
CAUTION
to the 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 handpiece 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 ¿rmly 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 ¿lled 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 (29 - 36.3psi). 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 ¿lter 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.
PRESTO
.
Degree of Risk
OM-K0516E 001