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| Example of Mine Pillar Cuts |
Pillar Cut serves two purposes relating to final cuts that are made into pillars. It automates the process of drawing cut pillars, and it creates new pillars and perimeters for use in calculating the tonnage removed from the cuts.
The command is run by first choosing a cut pattern, then
selecting the pillars to cut, and finally placing the pattern
inside a pillar. The pillars must be closed polylines in the
PILLARS layer. The cut pattern can contain either open or closed
polylines. When an open pattern symbol is placed in a pillar, Mine
Pillar Cut calculates the intersections between the pillar and the
end segments of the symbol, and fits the pattern into the pillar.
With a closed symbol, the cut pattern is clipped against the
pillar. There are two effects this
placement can have. One is to recreate the pillar with the cuts
taken out. The other creates perimeter polylines inside the pillar
in the spaces that are cut out.
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| Example of Mine Pillar Cuts |
Open cut patterns will not work if they divide a pillar into two or more separate pillars. Use a closed cut pattern if the pillar will be cut through.
To create custom cut patterns, create polylines in the desired pattern either as closed polylines or open polylines whose end segments will intersect the pillar when extended. Make sure that the polylines are the correct size to fit with a pillar. Then start Pillar Cut as usual and select the User-Defined symbol. It will ask you to select an insertion point, and pick a place in the table to store the new symbol. The next time Mine Pillar Cut is called, the new pattern should be in the table.
Mine Pillar Cut Symbols Dialog
Select a symbol to cut with or select User-Defined to begin the
procedure to define your own symbol.
Enter the azimuth for the cuts <0.0>: press
Enter This allows the cuts to be rotated when placed.
Cut the pillar or create new perimeter? (<Cut>/Perim)
press Enter a string If Cut is selected, the pillar is
re-drawn with the cut hacked out. If Perim is selected, perimeter
polylines are created inside the pillar in the spaces that are cut
out. The removed portion can be hatched with PERIM.
Select mine pillars (polylines in the PILLARS layer).
Select objects: select polylines This creates the set of
pillars that may be cut. These pillars must be closed polylines in
the PILLARS layer.
Pick a point for the symbol: pick a point This point
must be inside one of the selected mine pillars.
Pulldown Menu Location: Works
Keyboard Command: cutsym
Prerequisite: Pillars to cut and drawn as polylines in the
PILLARS layer
