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The system wide defaults for ELLH are located in the System Parameters program, under the “Devices” tab.
ELLH thickness breakpoint is used in the surface calculations to determine if elliptical cribbing is required for the job. The minimum value is 0 millimeters, which means thickness will not be checked (ie ELLH value will not be calculated).
Any value between 0.1mm and 5.0mm will trigger thickness checks of the cribbed diameter. Rx-Universe will checking the points of the frame between 30 and 150 degrees and between 210 and 330 degrees. If the edge thickness at the crib diameter at any of these points is less than the "breakpoint" value, then Rx-Universe will reduce the vertical crib by 0.5mm, until the thickness at the crib point is less than the breakpoint thickness, OR the vertical crib (ELLH) is less than the horizontal crib (CRIB) by the "ELLH maximum difference from", OR the ELLH is equal to the CRIB times "ELLH percentage of crib".
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ELLH can be suppressed by lens style, similar to cribbing. One thing to remember is that if cribbing is suppressed, then the ELLH is automatically suppressed.
Setting up the Device Parameters
The ELLH value on a job can be controlled by VCA device also. The settings in the device parameters screen , under the “Generator” tab, allow for more control on an individual device.
For each device you can set the following:
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The ELLH value can be set by the user only on "Uncut no frame" jobs. This is accomplished via the “F12 Surf opt” button on the order maintenance screen.
Crib and ELLH suppression can be controlled on each job. The ELLH value can also be set on an order in the ‘User ELLH” fields. The User ELLH value will override the device settings (limits) and send the User ELLH to the device.
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The crib and ELLH values can also be viewed in the “Devices fields” screen.
