def test_calc_base_circle_diameter_helical_gear(self):
alpha_t = Converter.grad2rad(20.28355)
beta = Converter.grad2rad(10.0)
z = 2
mn = 2
expected = 3.809833
actual = Flank.calc_base_circle_diameter(alpha_t, mn, beta, z)
self.assertAlmostEqual(expected, actual, 5)
def test_calc_base_circle_diameter_spur_gear(self):
alpha_t = Converter.grad2rad(20.0)
beta = Converter.grad2rad(0.0)
z = 2
mn = 2
expected = 3.75877
actual = Flank.calc_base_circle_diameter(alpha_t, mn, beta, z)
self.assertAlmostEqual(expected, actual, 5)
def test_calc_pitch_diameter_spur_gear(self):
mn = 2.0
z = 2
beta = Converter.grad2rad(0.0)
expected = 4.0
actual = Gear.calc_pitch_diameter(mn, z, beta)
self.assertAlmostEqual(expected, actual, 5)
def test_calc_pitch_diameter_negative_helical_gear(self):
mn = 2.0
z = 2
beta = Converter.grad2rad(-10.0)
expected = 4.061706
actual = Gear.calc_pitch_diameter(mn, z, beta)
self.assertAlmostEqual(expected, actual, 5)
def test_calc_transverse_pressure_angle_spur_gear(self):
beta = Converter.grad2rad(0.0)
alpha_n = Converter.grad2rad(20.0)
expected = Converter.grad2rad(20.0)
actual = Flank.calc_transverse_pressure_angle(alpha_n, beta)
self.assertAlmostEqual(expected, actual, 5)
def read_ste(filename):
content = {}
f = open(filename)
for line in f:
if line.__contains__('*1001'):
content.update(
{"number of teeth": int(extract_value_from_line(line))})
if line.__contains__('*1101'):
content.update(
{"normal module": float(extract_value_from_line(line))})
if line.__contains__('*1104'):
content.update({
"helix angle":
Converter.grad2rad(float(extract_value_from_line(line)))
})
if content["helix angle"] < Parameter.Precision.eps_normal:
content.update({
"helix angle direction":
Parameter.DirectionHelixAngle.LEFT
})
else:
content.update({
"helic angle direction":
Parameter.DirectionHelixAngle.RIGHT
})
if line.__contains__('*1106'):
content.update(
{"gear width": float(extract_value_from_line(line))})
if line.__contains__('*1107'):
content.update({
"addendum modification factor":
float(extract_value_from_line(line))
})
if line.__contains__('*1109'):
content.update(
{"tip diameter": float(extract_value_from_line(line))})
if line.__contains__('*1110'):
content.update({
"root diameter generated":
float(extract_value_from_line(line))
})
if line.__contains__('*1111'):
content.update({
"normal pressure angle left":
Converter.grad2rad(float(extract_value_from_line(line)))
})
if line.__contains__('*1112'):
content.update({
"normal pressure angle right":
Converter.grad2rad(float(extract_value_from_line(line)))
})
if line.__contains__('*1127'):
content.update({
"number of measuring teeth":
int(extract_value_from_line(line))
})
if line.__contains__('*1128'):
content.update(
{"tooth span": float(extract_value_from_line(line))})
if line.__contains__('*1129'):
content.update(
{"ball diameter": float(extract_value_from_line(line))})
if line.__contains__('*1130'):
content.update({
"measurement over balls":
float(extract_value_from_line(line))
})
f.close()
if ("normal pressure angle left"
in content) and not ("normal pressure angle right" in content):
content.update({
"normal pressure angle right":
content["normal pressure angle left"]
})
if not ("normal pressure angle left"
in content) and ("normal pressure angle right" in content):
content.update({
"normal pressure angle left":
content["normal pressure angle right"]
})
return content