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initial implementation of double helix for involute gear, though mirroring is hard coded to XY plane at Z=0, regardless of actual position and orientation of the gear. This issue is to be fixed in subsequent commits

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This commit is contained in:
kcleung
2017-06-26 10:30:51 +12:00
committed by looooo
parent c078b8f9f0
commit 279da3e304
1 changed files with 18 additions and 6 deletions
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24
gearfunc/_Classes.py
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@@ -94,6 +94,8 @@ class involute_gear():
"gear_parameter", "number of points for spline")
obj.addProperty(
"App::PropertyAngle", "beta", "gear_parameter", "beta ")
obj.addProperty(
"App::PropertyBool", "double_helix", "gear_parameter", "double helix")
obj.addProperty(
"App::PropertyLength", "backlash", "tolerance", "backlash")
obj.addProperty(
@@ -113,12 +115,14 @@ class involute_gear():
obj.clearance = 0.25
obj.head = 0.
obj.numpoints = 6
obj.double_helix = False
obj.backlash = '0.00 mm'
obj.reversed_backlash = False
self.obj = obj
obj.Proxy = self
def execute(self, fp):
fp.gear.double_helix = fp.double_helix
fp.gear.m_n = fp.module.Value
fp.gear.z = fp.teeth
fp.gear.undercut = fp.undercut
@@ -149,7 +153,7 @@ class involute_gear():
fp.Shape = sh.extrude(App.Vector(0, 0, fp.height.Value))
else:
fp.Shape = helicalextrusion(
wi, fp.height.Value, fp.height.Value * tan(fp.gear.beta) * 2 / fp.gear.d)
wi, fp.height.Value, fp.height.Value * tan(fp.gear.beta) * 2 / fp.gear.d, fp.double_helix)
else:
rw = fp.gear.dw / 2
circle = Part.Circle(App.Vector(0, 0, 0), App.Vector(0, 0, 1), rw)
@@ -433,11 +437,19 @@ class bevel_gear():
return None
def helicalextrusion(wire, height, angle):
spine = Wire(Line(fcvec([0., 0, 0]), fcvec([0, 0, height])).toShape())
auxspine = makeHelix(height * 2 * pi / abs(angle), height, 10., 0, bool(angle < 0))
solid = auxspine.makePipeShell([wire], True, True)
return solid
def helicalextrusion(wire, height, angle, double_helix = False):
if double_helix:
direction = bool(angle < 0)
first_spine = makeHelix(height * 2 * pi / abs(angle), height, 10., 0, direction)
first_solid = first_spine.makePipeShell([wire], True, True)
second_solid = first_solid.mirror(fcvec([0,0,0]), fcvec([0,0,1]))
return first_solid.fuse(second_solid)
else:
spine = Wire(Line(fcvec([0., 0, 0]), fcvec([0, 0, height])).toShape())
auxspine = makeHelix(height * 2 * pi / abs(angle), height, 10., 0, bool(angle < 0))
solid = auxspine.makePipeShell([wire], True, True)
return solid
def make_face(edge1, edge2):