IBS introduces coordinate-measuring machine
An
IBS Precision Engineering product story
Edited by the Engineeringtalk editorial team
Jul 31, 2009
IBS Precision Engineering has introduced the multi-probe Isara 400 3D coordinate-measuring machine.
This development has been achieved by increasing the measuring volume of its ultra precision 3D CMM by a factor of 40 - to 400 x 400 x 100mm3.
Using three planar mirror laser interferometers, Isara measures the position of an object on a table according to the Abbe principle that the functional point is in line with the measuring line, to avoid errors in parallax.
Positioned in one stiff frame with the probe, the interferometers' virtual intersection point coincides with the measuring point of the probe.
The product table, made from silicon carbide (SiC), is placed on a mirror table that can be moved in X and Y directions over a granite plate using porous media air bearings.
A monolithic block of Zerodur deposits the reflective coating directly onto three flat surfaces to form the three mirrors.
The mirror block assembly is directly connected to the machine and calibrated within it, allowing for both the flatness and the mutual perpendicularity of each mirror.
The metrology frame containing the three laser interferometers and the probe moves in the Z direction using air bearings over a granite guiding surface.
The interferometers always point to the centre point of the probe tip, while the metrology frame - also made from SiC - is stiff with no internal degree of freedom, avoiding the need for extra bearings.
The base frame consists of two granite guiding units - one for the X-Y system and one for the Z - joined to form a stable base frame.
The air-bearing-equipped direct drives for all three directions are mounted separately from the part they drive.
Thermal shielding prevents measurement errors and three vibration isolators counter disturbances due to environmental vibrations, while automated product handling prevents damage to critical parts.
The machine comes with a separate Abbe probe alignment tool and a camera for measurement visualisation, in addition to dust protection and acoustic insulation.
IBS PE's Triskelion ultra-precision touch probe will be initially implemented in the Isara 400.
Its design addresses the problems associated with most conventional probe systems: measuring uncertainty, probing forces and the probe tip being too large.
An AFM, a non-contact probe or optical probe, can also be implemented in the machine.
For all axes, the 1D measuring uncertainty is 45Nm, whereas the full-stroke 3D measuring uncertainty totals 100Nm.
Isara 400 can be used to measure large, free-form optic components.
The large measuring volume, in conjunction with the automated product handler, allows the use of trays containing several products to be measured in one run.
The Isara 400 will be available by the end of 2009.
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