Finishing - July-August 2020

14 MEASUREMENT
other hand, laser profile sensors may be
needed for surfaces with “matte” like finishes.
Metrology platform that is
significantly faster than
conventional systems
During the development of ZeroTouch,
special attention was given to problems that
conventional CMMs face: obtaining quick,
accurate and reproducible results to keep pace
with manufacturing cycle times. Most
traditional inspection systems have issues
specifically with speed, ease-of-use and
machine availability. As a result, traditional
measurement technology does not lend itself
to inline inspection or even fast sampling.
Providing the operator a tool that is easy to
use to perform rapid quality checks of various
types of parts produced by different lines is
vital to ensure the qualification of
manufacturing lines, in addition to speeding
up the production ramp. CMMs are typically
located in environmentally controlled
inspection rooms, which often impact machine
availability. If the parts are to be inspected in
the metrology room during the production
process, part "queues" are to be expected,
due to limited machine availability coupled
with long CMM setup times.
ZeroTouch has been designed precisely to
mitigate these issues, being fast, flexible, easy
to use, and compatible with the manufacturing
environment.
ZeroTouch enables 100% part inspection. In
addition, the ZeroTouch is characterized by its
ease of use. By giving the operator an easy-touse
tool, different types of parts produced on
different lines can be quickly inspected. Such
capability will enable the rapid qualification of
manufacturing lines and speed up production
ramp.
ZeroTouch’s unique architecture features 5
independent axes; a rotating bridge – Gonio
like – equipped with multiple, non-contact
sensors, including lasers and chromatic
confocal sensors, which dramatically increase
inspection speeds in measuring the entire part
surface, as there is no sensor change time. The
sensor bridge is configurable allowing for the
most optimal and appropriate sensor selections
to suit part geometries and surfaces, in
addition to the complex dimensions being
measured. Such innovations associated with a
horizontal rotary table and 3 translation axes
result in higher throughput of parts and
increased capacity, enabling 100% in-line
inspection rather than just sampling.
The innovative design of ZeroTouch
presents a remarkable improvement in
surmounting the challenge of repeatability in a
hostile manufacturing environment. Since it
can perform multiple measurements in parallel
using different sensors, parts and assemblies
can be analyzed significantly faster than a
conventional CMM.
“The sensors can be configured to the
specific GD&T measurements and the part,
and in one scan the system can capture data
points to create a high-density 3D model,”
says Mendez. “This makes it possible to
measure objects made of a wide variety of
materials with complex geometries, including
holes, undercuts, bevels, and surfaces, quickly
and with micrometer precision. At the same
time, the system provides very high
reproducibility and repeatability of results.”
The various non-contact sensors on the
metrology bridge can be easily calibrated by
software directly via the metrology platform.
Further time is saved by the simplicity with
which parts and assemblies can be placed on
the measuring table, instead of requiring
complex positioning fixtures. This, not only
decreases the metrology preparation time but
also enables direct cost savings in fixture
design, development and management.
“It was also important that ZeroTouch shows
no signs of wear, and delivers the same
performance year after year,” says Mendez.
“So we gave it a planar air bearing system”.
The moving parts, such as the measurement
platform and sensors, generate virtually no
friction during the measuring process. Part
inspection plans can be created within a few
hours and stored in the manufacturing
execution system (MES) for management and
retrieval. “The user is assisted by menu-guided
intuitive tools, making deep programming
knowledge superfluous now,” says Mendez.
“Instead, inspection plans can be prepared
using drag-and-drop functions.”
Measurement data for each component is
retained to ensure data integrity. Thereafter,
component-specific plans can be accessed in
the MES for fast measurement. Optionally,
components or assemblies can be given
barcodes to be read by an onboard barcode
reader. The respective inspection plan is then
automatically loaded from the MES. The
control software provides high personal safety
by ensuring that the system does not move as
long as the doors of the switchgear cabinet
are open or if the system light curtain has
interference.
Software with integrated
analysis tools for faster quality
control
The three-dimensional point cloud can be
analyzed immediately after the measurement
process. Integrations to proven analysis tools
enable the accurate comparison of the scan
results with part CAD models or a reference
part previously scanned and measured to not
only check for geometric and dimensional
tolerances, but for other previously undetected
issues such as surface aspect defects. Using
statistical process control (SPC), faults or
outside-tolerance deviations can be quickly
detected and appropriate reporting can be
sent back to the MES. This could enable the
adjustments of process parameters in
upstream manufacturing processes to
minimize rejects downstream.
The current system measures 240 x 150 x
190 cm (L x W x H) and weighs 3550 kg. It
can measure parts measuring up to 300 x
300 x 300 mm and weighing up to 10 kg. It
uses a high performance GPU PC with Intel
Core i7-7700T processor, and two capacitive
industrial monitors with touchscreens.
In the next issue:
Complete Finishing
Plant
Health and Safety
Anodizing and
Galvanizing
Finishing - July/August 2020