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Ch74-I044963.fm Page 369 Tuesday, August 1, 2006 9:45 PM
Page 369
Tuesday, August
1, 2006
9:45 PM
Ch74-I044963.fm
369
369
end coordinates of switch motions, which are estimated based on the CL&NC information previously
acquired. Moreover, it has the function to store the machine coordinates in the measuring point based
on CL data to the specific file promptly.
EXPERIMENT
We executed experiment to verify the feasibility of On-machine work piece measurement with laser
displacement sensor on 5-axis machining center in our research. Its major objectives were to:
^-Confirm that the measurement system perform the intended task smoothly.
^Verify that the laser displacement sensor can measure glossy surface of die, which is finish-
machined by ball end mill.

Figure 5: Machining and measuring
CAD/CAM: pro/ENGINEEK
3D-CAD model data of work piece

Main process on CAM software

On-machine work piece measurement
Measurement software -^

Figure 6: Procedure of on-machine work piece measurement

Simple convex shape was used as the object model. The work piece material of the object was
aluminum alloy. Convex is formed into width of 5 mm and height of 5 mm. In the measurement
process, we used only 3 linear axes for easy to calculate coordinate system. Measurement time is
approximately 9 min with 70 mm/min feed rate. Measurement interval is 70 ms and amount of
measurement point is 5000. The surface roughness after machining was 4 urn in Ra.