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Derby 454 Resquare Procedure 82-95206

Preparation:                                                                                      For use with ball bar 182-1160

1. Verify that probe tip, ballbar spheres, and qualification sphere are clean. 
2. Allow the machine, as well as the ball bar to sit in a temperature controlled environment for 8 hours.
3. Be sure that probe tips and articulating joints are secure and use only 1 probe position, straight down, for the entire procedure.
4. When positioning the ballbar, use insulated gloves to minimize heat flow from the operators hands to the ball bar. 

Measurement procedure:

1. To measure a ballbar requires the measurement of two spheres:  Sphere A, Sphere B.  To measure a ballbar 2 times requires the measurement of four spheres: Sphere A, Sphere B, Sphere A, Sphere B.  So, when measuring the ballbars 5 times as this procedure requires, a total of 10 spheres will have to be measured.  The ballbar orientations are shown in the subsequent pages.
2. Be careful not to confuse the radial and tangential bars.  Doing so will double the squareness error!
3. Taking exactly 16 points, approach perpendicular to the sphere as the approach vectors show below.
4. Each sphere must have a form error less than 10 microns.  If not, repeat sphere measurement.
5. Each of the 5 ballbars must be within 10 microns of each other.  If not, repeat all 5 measurements.
6. After measuring both bars for a given plane, compute, apply, and check the squareness before moving to the next plane.  (Recommended sequence of planes is XY, YZ, ZX)
7. Machine is considered acceptable when XY, YZ, & ZX resquares are less than the advertised machine spec (currently 2 arc seconds.)
8. Although measurements are only shown to 3 decimal points in the metric system, the calculated averages should be rounded to 4 decimal points.
9. After all three planes have been resquared, recheck all 3 axes to be sure that there has been no interaction between the planes.

XY Squareness

YZ Squareness

ZX Squareness

Finding the Resquare Utility:

1. Restart the system (Power off, power on)
2. If the language screen appears, select a language and press done.
3. At the home screen, note the machine serial number found in the upper left corner of the screen.
4. Press the service utilities softkey. (ambulence)
5. When prompted, enter the password, followed by the done softkey.  (The password is the last 5 digits of the machine serial number, reversed)
6. Press the resquare softkey.

Entering the Data:

1. Enter the appropriate plane.  (Each plane has its own screen)
2. Enter the calculated average radial length.
3. Enter the calculated average tangential length.
4. Press the done softkey to see the summary screen.  If the squareness value is less than the machines advertised spec, (currently at 2 arc seconds) then the procedure for that plane has passed.  Otherwise the step must be repeated.
5. Press the done softkey again to update the volcomp table.
6. Press the done softkey again to save the volcomp to the upper program card.  For more about how Derby handles its volcomp, go to the FAQs on the RefleX/Derby User Site.

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