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Cutting a wing:
After having configured your CNC machine and defined your cut
project, you just have to actually proceed to the cut ! This menu concentrate
all the data required to perform the cut, including building symetrical
parts. If you want, by switching the 'Cut to file' field, the program will
store the cut control data in an external file (format *.cut) rather than
performing the cut. The (*.cut) file is able to be processed by the LitCut
program which shows virtually the moves of the trolleys during the cut
on screen.
This menu is quite easy to understand. It includes a graphic
area and fields for the parameters:
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At the center of the window you find a diagram showing the position of
the foam block (blue) laying on the table (blank). If you see nothing,
check you table CNC configuration and your project. If you see a dotted
(red) line,check the block position which is invalid.
For parameters, you should particulary notice:
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The "Cut" area allows to choose which half wing to cut, and the cut sequence
order.
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Wire kerf compensation : the two types of compensation already described
can be selected.
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It is possible to trim the block directly above the leading and trailing
edges.
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The cut control data can be exported to a text file. In this cas, the trolleys
are not activated.
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The "Intermediate Section" selection allows to cut a trapezium in two parts,
which is interesting for large wingspan models.
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The Bloc Positionning parameters are required to compute the actual movements
for X and Y axis trolleys. Refer to chapter Principle
: Block Position.
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The wire kerf compensation parameters allows, as long as you know the wire
kerf values at tip and root, to cut the airfoil section at its real size.
With a small approximation on basic height, the vertical position of the
cut may be adjusted at tip and root in order to have the remains height
as a reference. Refer to .GP Diagram and foam
cores.
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The "Maximum Cut Speed" button may be used to know the maximum useable
speed for the cut.
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Block trimming (dressing) may be selected : without trimming, before, after
or during the airfoil section cut.
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Fill in the sheet for Parameters
and Définitions.
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Leave your block positionned after it has been dressed up,
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Write down and/or verify the position values: Centering, X0 offset and
Left Axis offset.
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Choose your parameters for wire kerf, speed and type of foam.
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Select which side of wing to cut (left or right ?),
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Then start the cut.
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