We make some of the largest and some of the smallest
artefacts for coordinate measuring machines (CMMs)
available on the market.
Most artefacts are made of carbon fibre composite,
vitro ceramics and alumina ceramics.
This guarantees a maximum of temporal
and thermal stability (very low CTE).
Our standard products are the Escalon Bars - for tactile and optical probing.
The shortest is 80 mm, the longest 3 m.
Trapet Precision Engineering
01139 Sarria (Alava)
tel . 34.945462666
e-mail: artefacts trapet.de
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click here for software and spreadsheets
The most accurate ESCALON reference ball beam, made of NEXCERA Ceramics (Krosaki Harima Corporation, Japan).
The thermal expansion coefficient is smaller than 0.1 ppm/K and the long term stability is among that of the best non-monocrystalinavailable materials.
Here 1 m beam with 51 balls. The largest beams are 1.5 m (76 balls).
Except for the HA ESCALON bars, these bars are made of uni directional carbon fibre composite.
The distances between the centres of the balls are calibrated. The balls lie in the symmetry line between the two beams of carbon fibre. This design yields high stability inlongitudinal direction.
As well the pole point distaqnces can be calibrated, providing the user with so-called bidirectional measures.
These "miniature ESCALON" bars are made similar to the Standard Escalon Bars, however with smaller balls.
This makes these bars not only suited for small CMMs and Micro CMMs, but as well for optical measurements (video-CMMs multi sensor CMMs) and for tomography systems.
Multi senor ESCALON
Our optical reference bars are made of Vitro-Ceramics with a carbon fibre frame.
Both materials yield high stability.
The carbon fibre frame protects the Vitro-Ceramic glass on which the calibrated chromium grating is deposited.
These ball bars are made of detatcheable structural segments.
On top of the assembled segments calibrated bars are fixed,
these calibrated bars are helt between balls on pivot elemnts.
It is possible to furnish all 3D-artefacts
with mat spheres for testing laser
scanners and fringe projection devices.
Ball Beam with mat spheres
dumbbells for fringe projection system verification, here with 160 mm, 80 mm and 40 mm diameter balls with virtually no volume scattering.
The material of the 160 mm balls is carbon fiber, covered with a fine-lapped paint. The balls up to 100 mm are of aluminium covered with paint and fine lapped to a form error of < 10 µm.
We believe that we are the only manufacturers of this type and size of low-volume-scattering spheres.
Dumbbells with lapped mat white surfaces, up to 160 mm diameter
for Tomography, Fringe Projectors, Video CMMs, ball dimeters are here 3 mm, lengths range from 10 mm to 200 mm
for tomography, diameter of balls is here 10 mm, material ruby
This ball plate is made of thermally invariant Carbon fibre rods and Robax (Vitro-Ceramics).
A special feature are the miniature balls which allow tactile and optical probing. The optical probing is improved by an auto-reflex-foil acting as "Virtual Backlight".
L-shaped Ball Plate
for very thorough checks and analysis of machine performance
for extremely fast interim check of CMMs and machine tools
Photogrammetry reference bars
have the same structure as ESCALON bars for tactile measurements but have elements which can be probed tactilely and by photogrammetry and video CMMs.
Here two different types of "innovative" targets are seen