DXF generator for involute gears

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Instructions

Usage example:
python gearsgen.py -n 5 -m 1 -c 0.5 -f mygear.dxf

Help message as generated by 'python gearsgen.py --help':

Usage: python gearsgen.py [ options ]

Options:

-i ....... generate outline for internal gear
(this means the meaning of pitch and clearance
is inverted the sign of the spacing is changed)

-n N ..... number of teeth (default = 5)

-m U ..... module (default = 1.0)
(for gears to mesh, their modules must be equal. the gears
working diameter is [number of teeth] times [module])

-c X ..... clearance (default = 0.0)
(move the gear bottom land down by this number of milimeters)

-a X ..... addendum offset (default = 0.0)
(move the gear top land up by this number of milimeters by
incrasing the addendum by this value. use with care!)

-p X ..... pitch (default = 0.0)
(move the gear top land up by this number of milimeters by
linearly extending the top land. do not confuse with '-a'!)

-s X ..... spacing (default = 0.0)
(move the flanks inside by this number of milimeters.)

-e ....... generate only DXF entities without DXF header or DXF footer
(usefull for creating larger dxf files from a script)

-l T ..... name of the DXF layer for generated entities
(without this option, no layer information is added to the DXF)

-x X ..... add this value to all X-coordinates in the generated DXF file
-y X ..... add this value to all Y-coordinates in the generated DXF file
-r X ..... rotate the generate wheel by this ange in degrees
(this can be used together with -e and -l to generate more complex
DXF files from scripts. default oriantation is gear at 0/0 with
a bottom land facing to the positive x-axis)

-f T ..... name of the DXF file to generate
(without this option, a (tk) window is opend and the generated gear
is displayed. note that the gear is scaled to fit the viewport.)

Argument types as used in abve options reference:
N = positive integer
U = unsigned decimal number
X = signed decimal number
T = text

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