WIP for hypocycloid disk creation

freecad/gears/commands.py

@@ -23,7 +23,7 @@ import os
 import FreeCAD
 import FreeCADGui as Gui
 from .features import ViewProviderGear, InvoluteGear, InvoluteGearRack
-from .features import CycloideGear, BevelGear, CrownGear, WormGear, TimingGear, LanternGear
+from .features import CycloideGear, BevelGear, CrownGear, WormGear, TimingGear, LanternGear, HypoCycloidGear
 
 
 class BaseCommand(object):
@@ -110,6 +110,13 @@ class CreateBevelGear(BaseCommand):
     MenuText = 'Bevel gear'
     ToolTip = 'Create a Bevel gear'
 
+class CreateHypoCycloidGear(BaseCommand):
+    NAME = "hypocycloidgear"
+    GEAR_FUNCTION = HypoCycloidGear
+    Pixmap = os.path.join(BaseCommand.ICONDIR, 'hypocycloidgear.svg')
+    MenuText = 'HypoCycloid gear'
+    ToolTip = 'Create a HypoCycloid gear with its pins'
+
 
 class CreateWormGear(BaseCommand):
     NAME = "wormgear"

freecad/gears/features.py

@@ -943,7 +943,35 @@ class LanternGear(object):
     def __setstate__(self, state):
         pass
 
+class HypoCycloidGear(object):
 
+    """parameters:
+        pressure_angle:  pressureangle,   10-30°
+        pitch_angle:  cone angle,      0 < pitch_angle < pi/4
+    """
+
+    def __init__(self, obj):
+        obj.addProperty("App::PropertyFloat","pin_circle_diameter",     "gear_parameter","Pin bold circle diameter(overrides Tooth Pitch")
+        obj.addProperty("App::PropertyFloat","roller_diameter",         "gear_parameter","Roller Diameter")
+        obj.addProperty("App::PropertyFloat","eccentricity",            "gear_parameter","Eccentricity")
+        obj.addProperty("App::PropertyAngle","pressure_angle_lim",      "gear_parameter","Pressure angle limit")
+        obj.addProperty("App::PropertyFloat","pressure_angle_offset",   "gear_parameter","Offset in pressure angle")
+        obj.addProperty("App::PropertyInteger","teeth_number",          "gear_parameter","Number of teeth in Cam")
+
+        obj.addProperty(
+            "App::PropertyLength", "height", "gear_parameter", "height")
+
+        obj.pin_circle_diameter = 92
+        obj.roller_diameter = 6
+        obj.eccentricity = 3
+        obj.pressure_angle_lim = '50.0 deg'
+        obj.pressure_angle_offset = 0.01
+        obj.teeth_number = 20
+        obj.height = '5. mm'
+        self.obj = obj
+        obj.Proxy = self
+
+    def execute(self, fp):
 
 def part_arc_from_points_and_center(p_1, p_2, m):
     p_1, p_12, p_2 = arc_from_points_and_center(p_1, p_2, m)

freecad/gears/icons/hypocycloidgear.svg

@@ -0,0 +1,41 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
+ "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg version="1.0" xmlns="http://www.w3.org/2000/svg"
+ width="236.000000pt" height="236.000000pt" viewBox="0 0 236.000000 236.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.16, written by Peter Selinger 2001-2019
+</metadata>
+<g transform="translate(0.000000,236.000000) scale(0.100000,-0.100000)"
+fill="#000000" stroke="none">
+<path d="M686 2225 c-56 -52 -19 -145 59 -145 49 0 85 36 85 85 0 76 -87 113
+-144 60z"/>
+<path d="M1502 2230 c-85 -79 26 -202 114 -126 59 50 22 146 -56 146 -23 0
+-44 -8 -58 -20z"/>
+<path d="M1078 2167 c-55 -16 -107 -53 -145 -105 -41 -55 -82 -91 -137 -119
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+-110 72 -122 232 -159 370 -83 50 28 72 33 141 37 79 4 85 3 171 -37 74 -34
+101 -41 149 -41 136 1 238 92 265 238 23 121 87 198 212 256 106 49 167 138
+167 242 0 61 -30 134 -78 191 -79 93 -106 208 -72 308 36 106 1 230 -82 298
+-59 47 -97 58 -210 62 -125 4 -184 29 -248 105 -71 83 -105 115 -142 133 -49
+23 -134 29 -190 14z m159 -347 c206 -26 390 -155 482 -338 50 -100 72 -188 72
+-295 0 -114 -14 -178 -64 -282 -52 -108 -122 -188 -221 -254 -88 -58 -109 -67
+-210 -91 -464 -112 -883 317 -766 782 64 253 275 444 528 477 95 12 89 12 179
+1z"/>
+<path d="M129 1665 c-15 -8 -32 -28 -37 -45 -27 -75 49 -141 119 -105 57 30
+66 90 20 136 -32 32 -62 36 -102 14z"/>
+<path d="M2088 1663 c-34 -21 -51 -65 -38 -96 19 -46 38 -60 81 -60 82 0 118
+86 60 144 -33 33 -63 36 -103 12z"/>
+<path d="M133 854 c-45 -22 -59 -66 -36 -113 31 -63 103 -67 146 -9 28 38 17
+92 -26 118 -38 24 -43 24 -84 4z"/>
+<path d="M2110 863 c-52 -19 -76 -70 -56 -118 25 -60 84 -72 135 -29 49 41 40
+108 -19 139 -31 16 -36 17 -60 8z"/>
+<path d="M686 264 c-35 -35 -35 -86 -1 -119 33 -34 87 -34 120 0 54 53 16 145
+-58 145 -24 0 -42 -8 -61 -26z"/>
+<path d="M1513 278 c-72 -35 -41 -158 41 -158 67 0 110 63 81 120 -25 48 -72
+62 -122 38z"/>
+</g>
+</svg>

freecad/gears/init_gui.py

@@ -46,7 +46,8 @@ class GearWorkbench(Workbench):
         "CreateCrownGear",
         "CreateWormGear",
         "CreateTimingGear",
-        "CreateLanternGear"]
+        "CreateLanternGear",
+        "CreateHypoCycloidGear"]
 
     def GetClassName(self):
         return "Gui::PythonWorkbench"
@@ -55,6 +56,8 @@ class GearWorkbench(Workbench):
         from .commands import CreateCycloideGear, CreateInvoluteGear
         from .commands import CreateBevelGear, CreateInvoluteRack, CreateCrownGear
         from .commands import CreateWormGear, CreateTimingGear, CreateLanternGear
+        from .commands import CreateHypoCycloidGear
+
         self.appendToolbar("Gear", self.commands)
         self.appendMenu("Gear", self.commands)
         # Gui.addIconPath(App.getHomePath()+"Mod/gear/icons/")
@@ -66,6 +69,7 @@ class GearWorkbench(Workbench):
         Gui.addCommand('CreateWormGear', CreateWormGear())
         Gui.addCommand('CreateTimingGear', CreateTimingGear())
         Gui.addCommand('CreateLanternGear', CreateLanternGear())
+        Gui.addCommand('CreateHypoCycloidGear', CreateHypoCycloidGear())
 
     def Activated(self):
         pass