THK ET20 Series, Manual

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The ET is used in the hand rotary mechanism of the
orthogonal-axis robot. The reduced weight of the thin structure
allows for a decreased load on the lower axis. The ET is used in the parts that rotate the table. The rotary
mechanism combines a cross-roller ring and a hypoid gear to
achieve highly accurate indexing.
θ
axis: ET Model used
θ
axis: ET
Hand: EG
X, Y, and Z axis: KSF
Models used
Orthogonal-axis robot
General industry
Index table
General industry
Diversified Applications
Basic Applications (Rotation)
330°/360° stroke rotation Continuous rotation in one direction Clockwise/counterclockwise rotation
Applied moment No speed fluctuations from varying loads Suspended installation
This product can be mounted from any surface, making it easy to install anywhere.
Note) This product cannot be installed with the
pulley facing downward. See the instruction
manual for details.
Upper surface
installation
Lower surface
installation
Side surface
installation
Two sizes are available: ET20 and ET35. The reduction ratio and motor size for each are given below.
Without motor: Servo motor specifications
TSC specifications
Without motor: Stepper motor specifications
Reduction ratio 45: 1/45
ET20
Reduction ratio 20: 1/20 30: 1/30
ET35
Reduction ratio 45: 1/45
ET20
Reduction ratio 20: 1/20 30: 1/30
ET35
Reduction ratio 45: 1/45
ET20
Reduction ratio
Motor size: 40×40
Motor size: 35×35
Motor size: 40×40
Motor size: 35×35
Motor size: 25×25
Motor size: 40×40
20: 1/20 30: 1/30
ET35
ET ET
KSF KSF
KSF KSF
EG EG
KSF KSF
ET ET
Applications
Mounting Methods
Example Applications
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