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Understanding Swivel Stage (Goniometer) Specifications
Specifications | Description | |
Model Number | SH07A-RT | 1. Kohzu's significant alpha-numeric model numbers offer quick product insight. |
Mirror Model Number | SH07A-RT-R | 2. Mirror symmetry of standard stage. |
Table Size | 70mm | 3. Table size refers to the stage's upper-most mounting surface. |
Guide Mechanism | Cross-Roller Bearing | 4. Type of movement mechanism used on this stage. |
Angular Range | ±10° | 5. Stage travel range in the positive and negative directions from it's centered or neutral position. |
Work Distance | 70mm±0.2mm | 6. Distance from table surface to rotation center. |
Rotation Center Play | φ0.05mm/±10° | 7. Deviation of rotation center while stage is rotating. |
Minimum Readout | 0.1° (vernier) | 8. Minimum readout of Table is the smallest measurable actuator motion increment at stage table. |
Angular Motion | 1.53°/ revolution | 9. Angle of gradient per handle-wheel revolution. |
Load Capacity (Horizontal) | 5kg | 10. Maximum load capacity is for a horizontally orientated stage with load centered on top-plate. |
Moment Load Stiffness | 0.9 arcsec / kgf-cm | 11. Moment load stiffness is measured in a direction perpendicular to the motion axis. See page 298 for details. |
Material | Aluminum Alloy | 12. Material specification is for stage's main body components only. |
Finish | Clear-Matte Anodizing | 13. Surface finish type and color. |
Weight | 570g | 14. Stage weight includes all components depicted in product photograph. |
Perpendicularity | 90°±1' | 15. Perpendicularity between motion axes in a dual-axis XY stage assembly. |
Actuator | Handle-Wheel | 16. Actuator model number and travel range. |
Guide Mechanism Type
Cross Roller Bearing
In cross-roller bearing guides, quench hardened and precision ground bearing surfaces move upon loose hardened steel cylinders (rollers) with rotation axes oriented in alternating 90 degree angles (Ref. Fig.1). Having rollers arranged in an alternating cross pattern allows preloading and operation at any angle. The roller bearings are held apart from one another by a bearing cage, which prevents adjacent rollers from touching. Since cross-roller bearing have little difference between static and dynamic friction they minimize start-to-stop slip-motion typical of other bearing types. The line contact of roller bearings along with precise roller-to-race gap management provide larger load bearing surfaces, higher preloads and meet very tight runout and stiffness specifications.
Dove-Tail Slide
Dove-Tail Slide is guide mechanism which is build from contiguous two face (Ref. Fig.2). In other words, that of guide mechanism is built from fixed part and movement part only. That is efficient of dust reduction from the parts slit. In addition, this type of stage have high load capacity and mechanical chock, because supportable touch field is large. On the other hands, easy to occur the stick slip on contiguous part, because difference between coefficient static and kinetic friction is big.
Feeding Mechanism
Worm Shaft and Worm Wheel
A worm shaft and worm wheel are used for deceleration and driving (see Fig. 3). For the worm wheel of the swivel stage, a portion is cut off and the gear is mounted on the upper stage. Since the worm gear is assembled on the worm shaft and lapping is performed precisely for each movement while the torque gauge is used for checking, almost no backlash or lost motion occurs.
Actuator Type
See Common Features of Kohzu Manual Stages section.
Angular Motion
For the SH series (except model SH07B-DH), the tilt angle is adjusted by rotating the handle that is directly connected to the worm shaft. The relationship between the tilt angle and the rotation of the handle-wheel is shown below.
ΔΘ = Δθ / n | Δθ: Tilt angle of stage |
n: Reduction ratio of worm wheel | |
Δθ : Rotation angle of handle |
For the ST series and model SH07B-DH, the stage top face and the horizontal plane can be tilted by pressing the bar mounted on the stage with the micrometer. Although the feed angle varies with the distances from the fulcrum of the lever to the power point and to the action point, and by the shape of sphere of the tip, the following relationship is seen near the center:
ΔΘ = tanˆ-1 (Δt / | R) ΔΘ: Tilt angle of stage |
R : Distance from rotation center to power point (mm) | |
Δt : Distance from neutral position of micrometer |
Standard & Reverse Stage Assembly Configurations
Assembling multiple stages can be customized to meet specific application requirements at no additional cost.
Model Number | Lower Axis Stage | Upper Axis Stage | Assembly Configuration |
ーNNN (no mark) | Standard (Right Hand) | Standard (Right Hand) | Standard Assembly |
ーNNR | Standard (Right Hand) | Standard (Right Hand) | Reversed Assembly |
ーNRN | Standard (Right Hand) | Mirror Symmetry (Left Hand) | Standard Assembly |
ーNRR | Standard (Right Hand) | Mirror Symmetry (Left Hand) | Reversed Assembly |
ーRNN | Mirror Symmetry (Left Hand) | Standard (Right Hand) | Standard Assembly |
ーRNR | Mirror Symmetry (Left Hand) | Standard (Right Hand) | Reversed Assembly |
ーRRN | Mirror Symmetry (Left Hand) | Mirror Symmetry (Left Hand) | Standard Assembly |
ーRRR | Mirror Symmetry (Left Hand) | Mirror Symmetry (Left Hand) | Reversed Assembly |
