In
1994 the international standard ISO 10360 "Acceptance
and reverication tests for coordinate measuring machines
(CMM)" had been established. This Norm
describes detailed test procedures for the various applications
of a CMM.
Before purchasing a Coordinate Measuring Machine,
it is certainly helpful to get familiar with the basics
of this standard. The following is a brief introduction
into the ISO 10360.
ISO 10360-1 (2000) “Vocabulary”
The first part of this norm defines all relevant terms
of coordinate measuring machines, for example
"Probing system" or "Reference sphere".
This part is not further elaborated here
ISO
10360-2 (2001) “CMMs used for measuring linear dimensions”
This part of the norm can be applied for all Coordinate
Measuring Machines. It describes the two basic specifications
of a CMM:
The "Volumetric length measuring error E"
and the "Volumetric probing error P".
ISO
10360-3 (2000) “CMMs with the axis of a rotary table
as the fourth axis”
The measuring errors of a Coordinate Measuring Machine
used in combination with a rotary table are defined
in this part of the standard.
The specifications are the Four-axis errors FR (R
= radial), FT (T = tangential) and FA (A = axial).
ISO
10360-4 (2000) “CMMs used in scanning measuring mode”
This part applies to Coordinate Measuring Machines
with the capability of continuous scanning. It describes
the measuring error in scanning mode.
Most CMM makers specify the "Volumetric scanning
probing error THP". Besides THP the norm also
specifies THN, TLP and TLN.
ISO 10360-5 (2000)
“CMMs using multiple stylus probing systems”
Coordinate Measuring Machines are
either equipped with a fixed probe head, which can
carry a cluster of probe pins (for example all CMMs
from Leitz). Or they work with one probe pin attached
to an articulating probe head. This part of the ISO
standard describes the errors obtained, when measuring
the same object with either different probes or by
articulating the probing system.
Specifications are the "Multiple Stylus
Location Error ML resp. AL",
the "Multiple Stylus Form Error MF
resp. AF" and the "Multiple
Stylus Size Error MS resp. AS".
ISO 10360-6(1999)"Estimation
of errors in computing of Gaussi anassociated features"
The last part of the standard describes
a method for testing the software used for computing
associated features from coordinate measurements.
This part is not further elaborated here. |
