Source code for boxes.generators.gearbox

#!/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 *


[docs]class GearBox(Boxes): """Gearbox with multiple identical stages""" ui_group = "Part" def __init__(self): Boxes.__init__(self) self.addSettingsArgs(edges.FingerJointSettings) self.argparser.add_argument( "--teeth1", action="store", type=int, default=8, help="number of teeth on ingoing shaft") self.argparser.add_argument( "--teeth2", action="store", type=int, default=20, help="number of teeth on outgoing shaft") 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): if self.teeth2 < self.teeth1: self.teeth2, self.teeth1 = self.teeth1, self.teeth2 pitch1, size1, xxx = self.gears.sizes(teeth=self.teeth1, dimension=self.modulus) pitch2, size2, xxx = self.gears.sizes(teeth=self.teeth2, dimension=self.modulus) t = self.thickness x = 1.1 * t * self.stages if self.stages == 1: y = size1 + size2 y1 = y / 2 - (pitch1 + pitch2) + pitch1 y2 = y / 2 + (pitch1 + pitch2) - pitch2 else: y = 2 * size2 y1 = y / 2 - (pitch1 + pitch2) / 2 y2 = y / 2 + (pitch1 + pitch2) / 2 h = max(size1, size2) + t b = "F" t = "e" # prepare for close box mh = self.shaft def sideCB(): self.hole(y1, h / 2, mh / 2) self.hole(y2, h / 2, mh / 2) self.moveTo(self.thickness, self.thickness) self.rectangularWall(y, h, [b, "f", t, "f"], callback=[sideCB], move="right") self.rectangularWall(x, h, [b, "F", t, "F"], move="up") self.rectangularWall(x, h, [b, "F", t, "F"]) self.rectangularWall(y, h, [b, "f", t, "f"], callback=[sideCB], move="left") self.rectangularWall(x, h, [b, "F", t, "F"], move="up only") self.rectangularWall(x, y, "ffff", move="up") profile_shift = 20 pressure_angle = 20 for i in range(self.stages - 1): self.gears(teeth=self.teeth2, dimension=self.modulus, angle=pressure_angle, mount_hole=mh, profile_shift=profile_shift, move="up") self.gears(teeth=self.teeth2, dimension=self.modulus, angle=pressure_angle, mount_hole=mh, profile_shift=profile_shift, move="right") for i in range(self.stages): self.gears(teeth=self.teeth1, dimension=self.modulus, angle=pressure_angle, mount_hole=mh, profile_shift=profile_shift, move="down")