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Sketching: Parametric sketching for gears#
This example shows how to use gear sketching shapes from PyAnsys Geometry.
Perform required imports and pre-sketching operations#
Perform required imports and instantiate the Modeler
instance and the basic elements that define a sketch.
[1]:
from pint import Quantity
from ansys.geometry.core import launch_modeler
from ansys.geometry.core.math import Plane, Point2D, Point3D
from ansys.geometry.core.misc import UNITS, Distance
from ansys.geometry.core.sketch import Sketch
from ansys.geometry.core.plotting import GeometryPlotter
# Start a modeler session
modeler = launch_modeler()
print(modeler)
# Define the origin point of the plane
origin = Point3D([1, 1, 1])
# Create a plane containing the previous point with desired fundamental directions
plane = Plane(
origin, direction_x=[1, 0, 0], direction_y=[0, -1, 1]
)
Ansys Geometry Modeler (0x1ed5d96c410)
Ansys Geometry Modeler Client (0x1ed5e23a0c0)
Target: localhost:700
Connection: Healthy
Sketch a dummy gear#
DummyGear
sketches are simple gears that have straight teeth. While they do not ensure actual physical functionality, they might be useful for some simple playground tests.
Instantiate a new Sketch
object and then define and plot a dummy gear.
[2]:
# Instantiate a new sketch object from previous plane
sketch = Sketch(plane)
# Define dummy gear
#
origin = Point2D([0, 1], unit=UNITS.meter)
outer_radius = Distance(4, unit=UNITS.meter)
inner_radius = Distance(3.8, unit=UNITS.meter)
n_teeth = 30
sketch.dummy_gear(origin, outer_radius, inner_radius, n_teeth)
# Plot dummy gear
sketch.plot()
After creating the sketch, extrudes it.
[3]:
# Create a design
design = modeler.create_design("AdvancedFeatures_DummyGear")
# Extrude your sketch
dummy_gear = design.extrude_sketch("DummyGear", sketch, Distance(1000, UNITS.mm))
# Plot the design
design.plot()
Sketch a spur gear#
SpurGear
sketches are parametric CAD spur gears based on four parameters:
origin
: Center point location for the desired spur gear. The value must be aPoint2D
object.module
: Ratio between the pitch circle diameter in millimeters and the number of teeth. This is a common parameter for spur gears. The value should be an integer or a float.pressure_angle
: Pressure angle expected for the teeth of the spur gear. This is also a common parameter for spur gears. The value must be apint.Quantity
object.n_teeth
: Number of teeth. The value must be an integer.
Instantiate a new Sketch
object and then define and plot a spur gear.
[4]:
# Instantiate a new sketch object from previous plane
sketch = Sketch(plane)
# Define spur gear
#
origin = Point2D([0, 1], unit=UNITS.meter)
module = 40
pressure_angle = Quantity(20, UNITS.deg)
n_teeth = 22
# Sketch spur gear
sketch.spur_gear(origin, module, pressure_angle, n_teeth)
# Plot spur gear
sketch.plot()
After creating the sketch, extrude it.
[5]:
# Create a design
design = modeler.create_design("AdvancedFeatures_SpurGear")
# Extrude sketch
dummy_gear = design.extrude_sketch("SpurGear", sketch, Distance(200, UNITS.mm))
# Plot design
design.plot()
Close the modeler#
[6]:
modeler.close()
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