KOBA-check® Sphere Plate
Characteristics of the KOBA-check Sphere Plate
Short-Term Stability
- Distortion-free support with ball bearing mountings in prisms on a
reinforcement plate
- The arrangement of the ceramic spheres in the neutral plane ensures
that no alterations in the gap between given spheres arise when there are
positional variations in the measured volume (bowing of the sphere plate)
and that their relative position to one another does not change.
- Insulating handles and plastic protection to reduce thermal effects
- Rigid underframe and assembly parts guarantee vibration free construction
Long-Term Stability
- A special aging process guarantees long life and a high degree of
dimensional stability.
- Symmetrical form ensures no distortion when used at different temperatures.
- Solid construction and purpose-built transport containers make warping
or damage during transport or assembly virtually impossible.
- The contact elements, embedded in the plate body, are protected from damage
- Ceramic spheres give the contact elements high resistance to wear.
Contact Elements of the Sphere Plate
- 30mm diameter ceramic spheres with a sphericity less then 0.15µm
- Ring gage with a dimensional variation of 0.3µm (calibrated on
request)
Accessibility of the Contact Elements
- The special configuration of the ceramic sphere area allows free access
to the equatorial area in tour sectors and scanning in hemispherical
halves around the poles.
- Drilled "voids" allow the measurement probe to be aligned at an angle
to the plate within certain limits, without collision occurring.
- In vertical operation, contact is possible from both sides of the
sphere plate.
Handling
- Screw-in insulating handles for easy maneuvering
- Accessories allow mounting in various positions
- Superfluous material is drilled out to reduce weight to a minimum
Construction
- Vertical construction with accessories in the direction of the axis
planes or the spatial diagonals. Horizontal construction parallel to the
measuring table 35° angled arrangement with underframe parts
Calibration
- KOBA-check sphere plate and probe test unit calibration can be done
by the appropriate laboratory, guaranteed traceable to the official
length standard
Required Time for Monitoring
- Quick set-up with easy to use assembly components
- Short tempering time with manipulation using insulating handles
- Three spatial axes are determined in one measurement cycle when positioned
in one diagonal of the measured volume
Technical Data
Spheres
| Number of Spheres: |
25 |
| Sphere Diameter: |
22µm |
| Sphericity |
<0.3µm |
| Material: |
AI2O3 |
| Hardness: |
> 1650 HV |
| Coefficient of Thermal Expansion: |
a = 11.5 x 10-6 K-1 |
Plate Body
| Material: |
Gage steel, treated against surface corrosion |
| Coefficient of Thermal Expansion: |
a = 11.5 x 10-6 K-1 |
Ring Gage
| Coefficient of Thermal Expansion: |
a = 11.5 x 10-6 K-1 |
| Dimensional Variations: |
< 0.5µm< 0.3µm on request (extra charge) |
Probe Test Sphere
| Coefficient of Thermal Expansion: |
a = 11.5 x 10-6 K-1 |
| Dimensional Variation: |
< 0.15µm |
| Hardness: |
> 1650 HV |
Ranges Supplied
- 4 standard sizes in square form
- Special sizes and designs at customer's request
- Accessories for fastening the sphere plate on the measuring instrument
table: adapter plate, additional lateral support, underfram elements
for 35° tilt
- Probe test unit
- Sturdy aluminum storage cade
| Size: |
620 |
420 |
320 |
230 |
| Dimensions |
620x620x24mm |
420x420x24mm |
320x320x24mm |
230x230x24mm |
| Weight |
28kg |
18kg |
11kg |
9kg |
| Max. Sphere Gage |
532mm |
332mm |
240mm |
150mm |
| Nr. of Spheres |
25 |
25 |
25 |
9 |
Data Analysis Software
Evaluation software is available for all artifacts, read more about our
available software here...
Applicable SIC Codes: 3423, 3545, 5049, 5084
Applicable NAICS Codes: 332212, 333515, 423490, 423830
