Product category:
Miscellaneous Instruments
News Release from: Mahr UK | Subject: Multisensor CMM - Goodrich
Edited by the Manufacturingtalk Editorial
Team on 27 June 2003
Multisensor CMM Improves Productivity at
Goodrich
A major problem to the EDM cell's production team was the ability to obtain consistent results when doing a first article inspection.
A major problem to the EDM cell's production team was the ability to obtain consistent results when doing a first article inspection The original measuring equipment was manually operated and, as such, was open to interpretation
This article was originally published on Manufacturingtalk on 3 Jun 2003 at 8.00am (UK)
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Each operator was able to measure with a high level of repeatability.
However, when a number of operators measured the same part on the same machine, the range was unacceptable.
Micron accuracy is critical to the manufacturing process and so the only solution was to automate the process.
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The constant demand from customers for 'best quality', combined with the increasingly competitive nature of the marketplace, has accelerated the development of test methods.
This was done with the purchase of a Mahr Multisensor CMM which is 3 axis coordinate measuring machine with a difference.
The difference is, not only does it use a touch trigger probe; it also comes with a camera and the option of a laser for high speed z axis measurement.
The Mahr CNC controlled MS400 was chosen for both accuracy, size and also its ability to work in close proximity to the EDM machines.
When using the machine, it's location was important because the EDM operators needed to be able to quickly check the first article before continuing to produce the batch.
The EDM operators are very skilled at machining the parts but the inspection requires a different approach.
A production machine drives to a position and starts cutting, whereas a measuring machine drives to a position and searches for an edge.
A verified independent check was also thought necessary and so skilled inspection personnel were trained in the use of the Multisensor.
A program of training key people to be responsible for the day to day running of the machine was given due consideration.
If the machine is not used effectively and quickly, many man hours are simply lost.
An unknown cost of buying new equipment.
A self teach program of options which, by using a mouse, enable the user to select geometric features, sensor type, light levels, etc The part programs are then stored and recalled by the EDM operators, as and when required.
To supply a CMM as part of a turnkey solution within a manufacturing cell is nothing new, but to supply a single CMM using different sensors is far less common.
Normally one would use a conventional CMM to measure those features large or rigid enough to measure with a touch trigger probe.
A camera based machine would then be used to measure any other necessary features.
This second solution brings its own problems.
How is the part presented to the camera? To create another alignment, for the camera to use, is going to be detrimental to the integrity of the measurement.
The two sets of features cannot be related with accuracy.
A Multisensor CMM is able to create an alignment using a touch trigger probe and to measure any features deemed suitable for that sensor.
Using the rotary table, the part can be turned and the camera used to measure any other features.
The original alignment is still retained for use with the camera and moves with the rotary table.
Thereby all measurements are measured and reported to one alignment which ensures the highest accuracy and no complication when submitting a report.
Speed, although not a major consideration, has improved considerably.
Originally, the parts were measured using two different pieces of equipment.
This not only involved a duplication of setup but also required the availability of each machine.
The new system is not only more accurate but uses one machine and one software.
It also takes only a fraction of the time and uses half the floor space of two standard machines.
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