New PlanetaryGear generator

boxes/generators/planetary.py

@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+# Copyright (C) 2013-2016 Florian Festi
+#
+#   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/>.
+
+from boxes import *
+import math
+
+class Planetary(Boxes):
+    """Gearbox with multiple identical stages"""
+    def __init__(self):
+        Boxes.__init__(self)
+        self.argparser.add_argument(
+            "--sunteeth",  action="store", type=int, default=8,
+            help="number of teeth on sun gear")
+        self.argparser.add_argument(
+            "--planetteeth",  action="store", type=int, default=20,
+            help="number of teeth on planets")
+        self.argparser.add_argument(
+            "--modulus",  action="store", type=float, default=3,
+            help="modulus of the theeth in mm")
+        self.argparser.add_argument(
+            "--shaft",  action="store", type=float, default=6.,
+            help="diameter of the shaft")
+        #self.argparser.add_argument(
+        #    "--stages",  action="store", type=int, default=4,
+        #    help="number of stages in the gear reduction")
+
+    def render(self):
+        # Initialize canvas
+        self.open()
+
+        ringteeth = self.sunteeth+2*self.planetteeth
+        
+        pitch1, size1, xxx = self.gears.sizes(teeth=self.sunteeth,
+                                          dimension=self.modulus)
+        pitch2, size2, xxx = self.gears.sizes(teeth=self.planetteeth,
+                                          dimension=self.modulus)
+        pitch3, size3, xxx = self.gears.sizes(
+            teeth=ringteeth, internal_ring=True, spoke_width=10,
+            dimension=self.modulus)
+
+        t = self.thickness
+        planets = int(math.pi//math.asin((self.planetteeth+2)/(self.planetteeth+self.sunteeth)))
+
+        # Make sure the teeth mash
+        ta = self.sunteeth+ringteeth
+        # There are sunteeth+ringteeth mashing positions for the planets
+        if ta % planets:
+            planetpositions = [round(i*ta/planets)*360/ta for i in range(planets)]
+        else:
+            planetpositions = planets
+
+        # XXX make configurable?
+        profile_shift = 20
+        pressure_angle = 20
+        spoke_width = 3*self.shaft
+        self.parts.disc(size3, lambda:self.hole(0,0,self.shaft/2), move="up")
+        self.gears(teeth=ringteeth, dimension=self.modulus,
+                   angle=pressure_angle, internal_ring=True,
+                   spoke_width=spoke_width, mount_hole=self.shaft,
+                   profile_shift=profile_shift, move="up")
+        self.gears.gearCarrier(pitch1+pitch2, spoke_width, planetpositions,
+                               2*spoke_width, self.shaft/2, move="up")
+        self.gears(teeth=self.sunteeth, dimension=self.modulus,
+                   angle=pressure_angle,
+                   mount_hole=self.shaft, profile_shift=profile_shift, move="up")
+        for i in range(planets):
+            self.gears(teeth=self.planetteeth, dimension=self.modulus,
+                       angle=pressure_angle,
+                       mount_hole=self.shaft, profile_shift=profile_shift, move="up")
+        
+        self.close()
+
+def main():
+    b = Box()
+    b.parseArgs()
+    b.render()
+
+if __name__ == '__main__':
+    main()

scripts/boxesserver

@@ -28,7 +28,7 @@ except ImportError:
 
 from boxes.generators import box, box2, box3, drillbox
 from boxes.generators import flexbox, flexbox2, flexbox3, flexbox4, gearbox
-from boxes.generators import flextest, flextest2, folder, pulley
+from boxes.generators import flextest, flextest2, folder, planetary, pulley
 from boxes.generators import magazinefile, trayinsert, traylayout, typetray, silverwarebox
 
 
@@ -91,6 +91,7 @@ class BServer:
             "GearBox" : gearbox.GearBox(),
             "MagazinFile" : magazinefile.Box(),
             "TrayInsert" : trayinsert.TrayInsert(),
+            "PlanetaryGear" : planetary.Planetary(),
             "Pulley" : pulley.Pulley(),
             "TypeTray" : typetray.TypeTray(),
             "SilverwareBox" : silverwarebox.Silverware(),