Content
Understanding Rotation Stage Specifications
Specifications | Description | |
Model Number | RM07A-C1 | 1. Kohzu's significant alpha-numeric model numbers offer quick product insight. |
Mirror Model Number | RM07A-C1-R | 2. Mirror symmetry of standard stage. |
Table Size | φ68mm | 3. Table size refers to the stage's upper-most mounting surface. |
Guide Mechanism | Crossed-Roller Bearing | 4. Type of guide mechanism used on this stage. |
Coarse Motion Range | 360° | 5. Stage travel range (coarse). |
Fine Motion Range | ±3° | 6. Stage travel range (fine) in the positive and negative directions from it's centered or neutral position. |
Eccentricity | ≦ 15μm / 360° | 7. Difference of rotation center while stage is rotating. See page 301 for detail. |
Surface Runout | ≦ 15μm / 360° | 8. Deviation of mounting stage surface while stage is rotating. See page 301 for detail. |
Minimum Readout (Table) | 1° | 9. Minimum readout of Table is the smallest measurable actuator motion increment at stage table. |
Minimum Readout (Micrometor) | 0.013° | 10. Minimum readout of Micrometer is the smallest measurable actuator motion increment at Micrometer or vernier scale. |
Load Capacity (Horizontal) | 10kg | 11. Maximum load capacity is for a horizontally orientated stage with load centered on top-plate. |
Moment Load Stiffness | 3 arcsec / kgf-cm | 12. Moment load stiffness is measured in a direction perpendicular to the motion axis. See page 298 for details. |
Material | Aluminum Alloy | 13. Material specification is for stage's main body components only. |
Finish | Clear-Matte Anodizing | 14. Surface finish type and color. |
Weight | 420g | 15. Stage weight includes all components depicted in product photograph. |
Actuator | Micrometer | 16. Actuator model number and travel range. |
Center hole size | Φ10 | 17. Hole size of table surface center. |
Coarse Clamping Torque Recommendation:
50~70mm Table Size: 1.5kg-cm
100~160mm Table Size: 2kg-cm
Caution: Over-tightening of coarse clamp will result in restricted movement.
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.
Slide Guide
Slide guide is guidance mechanism which is build from contiguous two face (Ref. Fig.2). In other words, that of guidance 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 of static and kinetic friction is big.
Actuator Type
See Common Features of Kohzu Manual Stages section.
Minimum Readout
Fine angle adjustment is achieved by micrometer pushing the bar which is mounted stage. Accurate travel angle is calculated based upon the distance from fulcrum to power point and action point of the lever, and shape of bar head. However, near center point can be calculated as below.
θ = tan-1 （t/R） | R: distance from the rotation center to power point (mm) |
t: distance from medium point of micrometer. |