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less than 1" (25 mm). NEVER use a longer di-
ameter wheel.
c) When dimension d is 1/8" (3.175 mm), the
diameter of the wheel (dimension D) should be
less than 3/8" (10 mm).
d) Dimension L varies according to the dimen-
sion D. Dimension L can be longer as dimension
D increase. Refer to the following table:
Wheels can be simply attached and detached
by using two wrenches. (Fig. 3)
Tapered section
Collet chuck
d
1/8" (3.175 mm)
3/16"
1/4"
5/16"
3/8"
D
(5 mm)
(6 mm)
(8 mm)
(10 mm)
1/2"
3/4"
3/4"
3/4"
L
(13 mm)
(20 mm)
(20 mm)
(20 mm)
Do not tighten the collet chuck by inserting a
shaft thinner than the regular shaft diameter
Ø 1/4''(6.35 mm) in the chuck or in an empty
condition. This practice will damage the col-
let chuck. When installing a wheel with shaft,
tighten the collet chuck after applying a small
quantity of spindle oil (or sewing machine oil)
to the tapered portion indicated in Fig. 4
MAINTENANCE
WARNING: Be sure to switch power OFF
and disconnect the plug during maintenance
and inspection. Using cracked, deformed or
damaged wheels can lead to wheel breakage
and resulting serious injury.
1/4" (6,35 mm)
1/2"
5/8"
3/4"
1"
(13 mm)
(16 mm)
(20 mm)
(25 mm)
1-1/2"
3/4"
1" (25 mm) 1" (25 mm)
(38 mm)
(20 mm)
S
Ø-S= 1/4" (6,35 mm)
E N G L I S H •
1. Inspecting the wheel ensures that the wheel
is free of cracks and surface defects.
WARNING: Using this portable grinder with
loosened screws is extremely dangerous.
2. Inspecting the mounting screws Regularly
inspect all mounting screws and ensure that
they are properly tightened. Should any of the
screws be loose, retighten them immediately.
3. Inspecting the carbon brushes The motor
employs carbon brushes which are consumable
parts. Replace the carbon brush with a new
one when it becomes worn to its wear limit.
Always keep carbon brushes clean and ensure
that they slide freely within the brush holders.
CAUTION: Using this portable grinder with
a carbon brush which is worn in excess of the
wear limit could damage the motor.
REPLACING CARBON BRUSHES
Remove the brush caps (Fig. 1) with a slotted
screwdriver. The carbon brushes then, can be
easily removed.
Specifications are subject to change without
any obligation on the part of the URREA.
TECHNICAL DATA
VOLTAGE-FREQUENCY
NO LOAD SPEED
COLLET CAPACITY
POWER
WEIGHT
U se r's m a n ua l
120 V ~ 60 Hz
27 000 r/min
1/4" (6,35 mm)
550 W
2,5 kg (5,5 lb)
13
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