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Fig. 1 Test conditions
Ball screw
Shaft diameter: 20 mm
Lead: 20 mm
Preload : 800 N
Rotational speed: 1200 min-1
Stroke: 250 mm
Amount of grease: 1 cc
Measurement interval: 1 h

KURODA C-Grease

100

100100200300Operating time (h)

400

500

Particles generated by the ball screw (particle size 0.13 μm or more)
10000
Lithium grease
1000

Grease for optical instruments

100
10KURODA C-Grease1íWR&%HIRUHXVLQJ&*UHDVHFDUHIXOO\UHDGWKHSUHFDXWLRQVRQWKH³6DIHW\'DWD6KHHW´ 6'6 RIWKH
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10000200
400600800
1000
Rotational speed of the screw shaft (min-1)

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1200

Grease viscosity comparison

Change in Operating time-Preload torque1.82520

Lithium grease
KURODA C-Grease

151050Fig. 2 Test conditions
Ball screw
Shaft diameter: 20 mm
Lead: 20 mm
Preload : 800 N
Stroke: 250 mm
Amount of grease: 1 cc
Measurement interval: 1 hThese values are mean values
taken after 100 measurements ofeach rotational speed. The operatingtime of the ball screw during thosemeasurements is about 240 hours.

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Grease for optical
Fluorine grease instruments
Operating time (non dimension)

Test conditions are the same as those in Fig. 2.
The less preload torque, the better the lubrication
performance.

Max. current value ratio

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Number of particles (pcs./CF)

Features

Particles generated by the ball screw (particle size 0.13 μm or more)

1.6

1.52
Fluorinegrease

1.4
1.2
1.0

1.00
Lithiumgrease

1.13
KURODAC-Grease

0.8
The above bars indicate the maximum current value ratio
at 500 mm/s (1500 min-1) for a single-axis robot.
The current value of the drive motor is proportional to theload torque.
Therefore, the larger the current value is, the larger thegrease resistance becomes (smoothness is reduced).

E-31

Ball screw
related products

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Preload torque (N·cm)

Ball screw
related products

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Standard lithium grease
7,500

5,000

2,500

KURODA S-Grease

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1,000
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6040Before operation
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200−20−40−600100200(forward)

300200100(backward)
Position (mm)0Comparison of torque ratio
between greased ball screw
and ungreased ball screw

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500%

Grease D

400%300%
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Grease B

200%
100%
0% No grease application KURODA S-Grease
2004006008001,000
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Ball screw
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Low particle generating KURODA S-Grease