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Operation
Template Guidelines
Factors that are associated to the template
preparation that influence the tracing operation
include:
•
Contrast between line and background.
•
Cleanliness of the pattern.
•
Width of the line in line-draw patterns.
•
Type of material on which the patterns are
drawn.
•
Type of material used to draw the patterns.
To produce patterns that provide best results, we
recommend:
•
The edge of the line should be drawn accurately,
since it is the edge of the pattern that will be
traced.
•
A red pen or pencil can be used for pattern
construction lines or observations. The tracer
does not detect red.
•
For optimum performance, lines should be
drawn in black India Ink, with a minimum line
width of 0.03 inch (0.7mm) on a white or buff
background. H or HB grade pencil drawn lines
with a minimum width of 0.016 inch (0.5mm) will
also provide acceptable results.
•
When using pencil, the lines should be dense
and continuous. Drawing over a line several
times tends to polish the surface, transforming it
in a kind of mirror. This should be avoided.
•
Some materials appear black to the human eye,
but are seen differently to the tracer. These
materials should be avoided. Refer to the
Drawing Materials Table.
•
Paper or card stock used for patterns should
be moisture resistant. Some materials readily
absorb moisture and may change size. See
Drawing Materials Table.
•
Patterns should be kept clean and free from grit,
marks or smudges near the tracer's path.
•
The minimum distance between adjacent lines
on the pattern should not be less that the lead.
SECTION 4
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