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Of the above fields, the _BLKDM (physical diameter of the block), _BLKRD (radius of curvature of the inside of the block), and _BLKCEHI (height of the block piece) must be set in Rx-Universe. The _LBLHI and RNGH values will be calculated by the blocker, based on the difference in curvature between the block piece and the front surface of the blank, and the amount of adhesive used, and sent back to Rx-Universe. These values will then be used when communucating communicating with other devices.
The particular block pieces that are available, with their characteristics, and rules on when to use the block, must be set up in Rx-Universe, under "Setup", "System Settings", then the "Nucleo / Art" tab.
The ART and Nucleo blocks can be set up separately. For each block piece:
- the The "Text" column specifies the text that will be printed on the work ticket.
- the The "radius" field is the radius curvature of the inside block piece (_BLKRD)
- the The "min r" field is the minimum radius of curvature of the blank for this block piece
- the The "max r" field is the maximum radius of curvature of the blank for this block piece
- the The BLKCEHI column is the height of the block
- the The "diameter" fields (BLKDM)
- this This is the physical diameter of a new (unused) block piece (_BLKDM). Nucleo and standard ART blocks only come in one diameter. The Art Premuim ART blocks are available in 50, 55, 60, 65, 70 and 75 mm diameters.
- For ART blocks, the lab can select which diameters they are going to stock by clicking on the appropriate grid cell.
Allow ART Cribbing flag, when checked, will allow a an ART block piece to be picked, even if the radius is greater than the crib value. Normally this is only set when the lab uses standard ART blocks although Premium blcks can be cribbed, it is not done since premium blocks are more expensive to purchase.
ART cribbing allowance this value is added to the crib amount when selecting the block diameter to use.
Block repick tolerance will control if block selection should be reperformed when an order is recalculated (e.g. by attaching trace). The originally selected block will be replaced only if the new block is larger by at least this tolerance (release pending in a future version of Rx-Universe)
To pick a block piece, the "true curve" of a blank will be converted to radius of curvature, that radius of curvature compared to the "min r" and "max r" values for each block, and the block picked that includes the radius of curvature of the blank. In the case of ART Premium blocks, since each block radius comes in various diameters If "Allow ART Cribbing" is unchecked , the block selected will be based on the required blank cribbing. The cribbing required will be checked against the "Diameter selection" table for ART Premium and the "Group" will be used to select the correct block diameter along with the radius when determining the block to use..
For example, if a blank has a true curve of 5.92, in 1.53 index, that blank has a radius of curvature of 89.527. Comparing that to the "min r" and "max r" of the block list, block piece 5 will be selected.
To add a new blockpiece block piece or crib group to a grid, right-click on the click, and select either "Add Row" or "Remove row" as appropriate.
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Because ART and Nucleo blocks can may be cribbed (the cribbing process actually cribs the block down, as well as the blank), and the block pieces can be re-used, a lab will quickly find itself with many block pieces of different diameters. To re-use, the blocks can be grouped into "groups" by diameter. The number of groups and the sizes of each group can be defined by the lab.
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