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add timing gear t-shape

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looooo
2024-01-02 00:02:42 +01:00
parent 17715c0754
commit 9e14aac76b
6 changed files with 544 additions and 9 deletions
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13
freecad/gears/commands.py
View File

@@ -19,14 +19,13 @@
import os
import FreeCAD
import FreeCADGui as Gui
from .features import (
ViewProviderGear,
InvoluteGear,
InternalInvoluteGear,
InvoluteGearRack,
CycloidGearRack,
)
from .features import (
CycloidGear,
BevelGear,
CrownGear,
@@ -36,6 +35,8 @@ from .features import (
HypoCycloidGear,
BaseGear,
)
from .timing_gear_t import TimingGearT
from .connector import GearConnector, ViewProviderGearConnector
@@ -167,6 +168,14 @@ class CreateWormGear(BaseCommand):
ToolTip = "Create a Worm gear"
class CreateTimingGearT(BaseCommand):
NAME = "TimingGearT"
GEAR_FUNCTION = TimingGearT
Pixmap = os.path.join(BaseCommand.ICONDIR, "timinggear_t.svg")
MenuText = "Timing Gear T-shape"
ToolTip = "Create a Timing gear T-shape"
class CreateTimingGear(BaseCommand):
NAME = "TimingGear"
GEAR_FUNCTION = TimingGear

1
freecad/gears/features.py
View File

@@ -16,7 +16,6 @@
# * *
# ***************************************************************************
from __future__ import division
import os
import sys

404
freecad/gears/icons/timinggear_t.svg Normal file
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@@ -0,0 +1,404 @@
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17
freecad/gears/init_gui.py
View File

@@ -105,6 +105,7 @@ class GearWorkbench(Workbench):
"CreateBevelGear",
"CreateCrownGear",
"CreateWormGear",
"CreateTimingGearT",
"CreateTimingGear",
"CreateLanternGear",
"CreateHypoCycloidGear",
@@ -119,15 +120,20 @@ class GearWorkbench(Workbench):
CreateCycloidGear,
CreateInvoluteGear,
CreateInternalInvoluteGear,
CreateBevelGear,
CreateInvoluteRack,
CreateCrownGear,
CreateWormGear,
CreateTimingGearT,
CreateTimingGear,
CreateLanternGear,
CreateHypoCycloidGear,
CreateCycloidRack,
CreateGearConnector
)
from .commands import CreateBevelGear, CreateInvoluteRack, CreateCrownGear
from .commands import CreateWormGear, CreateTimingGear, CreateLanternGear
from .commands import CreateHypoCycloidGear, CreateCycloidRack
from .commands import CreateGearConnector
self.appendToolbar("Gear", self.commands)
self.appendMenu("Gear", self.commands)
# Gui.addIconPath(App.getHomePath()+"Mod/gear/icons/")
Gui.addCommand("CreateInvoluteGear", CreateInvoluteGear())
Gui.addCommand("CreateInternalInvoluteGear", CreateInternalInvoluteGear())
Gui.addCommand("CreateCycloidGear", CreateCycloidGear())
@@ -136,6 +142,7 @@ class GearWorkbench(Workbench):
Gui.addCommand("CreateInvoluteRack", CreateInvoluteRack())
Gui.addCommand("CreateCrownGear", CreateCrownGear())
Gui.addCommand("CreateWormGear", CreateWormGear())
Gui.addCommand("CreateTimingGearT", CreateTimingGearT())
Gui.addCommand("CreateTimingGear", CreateTimingGear())
Gui.addCommand("CreateLanternGear", CreateLanternGear())
Gui.addCommand("CreateHypoCycloidGear", CreateHypoCycloidGear())

113
freecad/gears/timing_gear_t.py Normal file
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@@ -0,0 +1,113 @@
# -*- coding: utf-8 -*-
# ***************************************************************************
# * *
# * This program is free software: you can redistribute it and/or modify *
# * it under the terms of the GNU General Public License as published by *
# * the Free Software Foundation, either version 3 of the License, or *
# * (at your option) any later version. *
# * *
# * This program is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU General Public License for more details. *
# * *
# * You should have received a copy of the GNU General Public License *
# * along with this program. If not, see <http://www.gnu.org/licenses/>. *
# * *
# ***************************************************************************
import numpy as np
import scipy as sp
import FreeCAD as App
import Part
from pygears._functions import (
rotation,
reflection
)
from .features import BaseGear, fcvec
class TimingGearT(BaseGear):
def __init__(self, obj):
print("hello gear")
obj.addProperty("App::PropertyLength", "pitch", "base", "pitch of gear")
obj.addProperty("App::PropertyInteger", "teeth", "base", "number of teeth")
obj.addProperty("App::PropertyLength", "tooth_height", "base", "radial height of tooth")
obj.addProperty("App::PropertyLength", "u", "base", "radial distance from tooth-head to pitch circle")
obj.addProperty("App::PropertyAngle", "alpha", "base", "angle of tooth flanks")
obj.addProperty("App::PropertyLength", "height", "base", "extrusion height")
obj.pitch = "5. mm"
obj.teeth = 15
obj.tooth_height = "1.2 mm"
obj.u = "0.6 mm"
obj.alpha = "40. deg"
obj.height = "5 mm"
self.obj = obj
obj.Proxy = self
def generate_gear_shape(self, fp):
print("generate gear shape")
pitch = fp.pitch.Value
teeth = fp.teeth
u = fp.u.Value
tooth_height = fp.tooth_height.Value
alpha = fp.alpha.Value / 180. * np.pi # we need radiant
height = fp.height.Value
r_p = pitch * teeth / 2. / np.pi
gamma_0 = pitch / r_p
gamma_1 = gamma_0 / 4
p_A = np.array([
np.cos(-gamma_1),
np.sin(-gamma_1)
]) * (r_p - u - tooth_height / 2)
def line(s):
p = p_A + np.array([
np.cos(alpha / 2 - gamma_1),
np.sin(alpha / 2 - gamma_1)
]) * s
return p
def dist_p1(s):
return (np.linalg.norm(line(s)) - (r_p - u - tooth_height)) ** 2
def dist_p2(s):
return (np.linalg.norm(line(s)) - (r_p - u)) ** 2
s1 = sp.optimize.minimize(dist_p1, 0.).x
s2 = sp.optimize.minimize(dist_p2, 0.).x
p_1 = line(s1)
p_2 = line(s2)
mirror = reflection(0.) # reflect the points at the x-axis
p_3, p_4 = mirror(np.array([p_2, p_1]))
rot = rotation(-gamma_0) # why is the rotation in wrong direction ???
p_5 = rot(np.array([p_1]))[0] # the rotation expects a list of points
l1 = Part.LineSegment(fcvec(p_1), fcvec(p_2)).toShape()
l2 = Part.LineSegment(fcvec(p_2), fcvec(p_3)).toShape()
l3 = Part.LineSegment(fcvec(p_3), fcvec(p_4)).toShape()
l4 = Part.LineSegment(fcvec(p_4), fcvec(p_5)).toShape()
w = Part.Wire([l1, l2, l3, l4])
# now using a FreeCAD Matrix (this will turn in the right direction)
rot = App.Matrix()
rot.rotateZ(gamma_0)
wires = []
for i in range(teeth):
w = w.transformGeometry(rot)
wires.append(w.copy())
contour = Part.Wire(wires)
if height == 0:
return contour
else:
face = Part.Face(Part.Wire(wires))
return face.extrude(App.Vector(0., 0., height))

5
pygears/_functions.py
View File

@@ -22,9 +22,11 @@ from numpy.linalg import solve, norm
def reflection(angle):
mat = array([[cos(2 * angle), -sin(2 * angle)], [-sin(2 * angle), -cos(2 * angle)]])
mat = array([[cos(2 * angle), -sin(2 * angle)],
[-sin(2 * angle), -cos(2 * angle)]])
def func(x):
# why not use mat @ x???
return dot(x, mat)
return func
@@ -40,6 +42,7 @@ def reflection3D(angle):
)
def func(x):
# why not use mat @ x
return dot(x, mat)
return func