posted 08 January 2001 03:14 PM              

Our needs: we bought the CMM to measure production parts with a precision of about 0.025 mm (0.00098 inch) but it will be use sometimes to measure our tooling which is more precise (0,010 mm i.e. 0.00039 inch).

Installation: The CMM will be install in our QC laboratory ("laboratory" according to the QS-9000 definition...) and the dimensions of this lab are about 12 feet X 22 feet. Close to this lab (about 12 feet), there is a 180 tons press in a pit of 8 feet deep. The press is mounted on a concrete base of 8 feet X 6 feet X 3 feet height (we installed this new press about 1 month ago).

Vibration comes from the press and that has an effect on our optic comparator (we can see the vibration at the screen). This vibration is important enough that the QC technician takes his measurement between the press movements.

We have 2 alternatives proposed by the CMM dealers and a local engineering consultant firm to reduce the vibration: an independant concrete base (independant floor) OR an air cussion to be placed under the CMM (this solution is for the CMM only in opposite to the first solution that can be done for both the CMM and the comparator). Both solutions are quite expensive (in comparison with the CMM cost...)

There is also a significant flow of employee in the lab (2 QC technicians, formeman, process engineers...) that use the only door.

Will we be able (with a fast solution..., we don't want to build a new lab...) to eliminate the vibrations and to control the environmental conditions (Temperature and Humidity).

posted 10 January 2001 08:49 AM              

quote:

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Originally posted by Marc Smith:
Have any vibration studies been done at the location where you want to put the CMM? It's hard to say what will work to isolate the CMM if you don't know how 'deep' the problem is.

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