108 lines
4.5 KiB
Python
108 lines
4.5 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2013-2016 Florian Festi
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from boxes import *
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import math
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class Planetary(Boxes):
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"""Planetary Gear with possibly multiple identical stages"""
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ui_group = "Part"
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def __init__(self):
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Boxes.__init__(self)
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self.argparser.add_argument(
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"--sunteeth", action="store", type=int, default=8,
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help="number of teeth on sun gear")
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self.argparser.add_argument(
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"--planetteeth", action="store", type=int, default=20,
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help="number of teeth on planets")
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self.argparser.add_argument(
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"--maxplanets", action="store", type=int, default=0,
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help="limit the number of planets (0 for as much as fit)")
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self.argparser.add_argument(
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"--deltateeth", action="store", type=int, default=0,
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help="enable secondary ring with given delta to the ring gear")
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self.argparser.add_argument(
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"--modulus", action="store", type=float, default=3,
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help="modulus of the theeth in mm")
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self.argparser.add_argument(
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"--shaft", action="store", type=float, default=6.,
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help="diameter of the shaft")
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# self.argparser.add_argument(
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# "--stages", action="store", type=int, default=4,
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# help="number of stages in the gear reduction")
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def render(self):
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ringteeth = self.sunteeth + 2 * self.planetteeth
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spoke_width = 3 * self.shaft
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pitch1, size1, xxx = self.gears.sizes(teeth=self.sunteeth,
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dimension=self.modulus)
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pitch2, size2, xxx = self.gears.sizes(teeth=self.planetteeth,
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dimension=self.modulus)
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pitch3, size3, xxx = self.gears.sizes(
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teeth=ringteeth, internal_ring=True, spoke_width=spoke_width,
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dimension=self.modulus)
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t = self.thickness
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planets = int(math.pi / (math.asin(float(self.planetteeth + 2) / (self.planetteeth + self.sunteeth))))
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if self.maxplanets:
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planets = min(self.maxplanets, planets)
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# Make sure the teeth mash
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ta = self.sunteeth + ringteeth
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# There are sunteeth+ringteeth mashing positions for the planets
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if ta % planets:
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planetpositions = [round(i * ta / planets) * 360 / ta for i in range(planets)]
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else:
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planetpositions = planets
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# XXX make configurable?
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profile_shift = 20
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pressure_angle = 20
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self.parts.disc(size3, callback=lambda: self.hole(0, 0, self.shaft / 2), move="up")
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self.gears(teeth=ringteeth, dimension=self.modulus,
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angle=pressure_angle, internal_ring=True,
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spoke_width=spoke_width, mount_hole=self.shaft,
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profile_shift=profile_shift, move="up")
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self.gears.gearCarrier(pitch1 + pitch2, spoke_width, planetpositions,
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2 * spoke_width, self.shaft / 2, move="up")
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self.gears(teeth=self.sunteeth, dimension=self.modulus,
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angle=pressure_angle,
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mount_hole=self.shaft, profile_shift=profile_shift, move="up")
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numplanets = planets
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if self.deltateeth:
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numplanets += planets
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deltamodulus = self.modulus * ringteeth / (ringteeth - self.deltateeth)
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self.gears(teeth=ringteeth - self.deltateeth, dimension=deltamodulus,
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angle=pressure_angle, internal_ring=True,
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spoke_width=spoke_width, mount_hole=self.shaft,
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profile_shift=profile_shift, move="up")
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for i in range(numplanets):
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self.gears(teeth=self.planetteeth, dimension=self.modulus,
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angle=pressure_angle,
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mount_hole=self.shaft, profile_shift=profile_shift, move="up")
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