boxespy/boxes/generators/gearbox.py

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#!/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 *
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class GearBox(Boxes):
"""Gearbox with multiple identical stages"""
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ui_group = "Part"
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def __init__(self):
Boxes.__init__(self)
self.addSettingsArgs(edges.FingerJointSettings)
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self.argparser.add_argument(
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"--teeth1", action="store", type=int, default=8,
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help="number of teeth on ingoing shaft")
self.argparser.add_argument(
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"--teeth2", action="store", type=int, default=20,
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help="number of teeth on outgoing shaft")
self.argparser.add_argument(
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"--modulus", action="store", type=float, default=3,
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help="modulus of the teeth 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")
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")
def render(self):
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if self.teeth2 < self.teeth1:
self.teeth2, self.teeth1 = self.teeth1, self.teeth2
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pitch1, size1, xxx = self.gears.sizes(teeth=self.teeth1, dimension=self.modulus)
pitch2, size2, xxx = self.gears.sizes(teeth=self.teeth2, dimension=self.modulus)
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t = self.thickness
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x = 1.1 * t * self.stages
if self.stages == 1:
y = size1 + size2
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y1 = y / 2 - (pitch1 + pitch2) + pitch1
y2 = y / 2 + (pitch1 + pitch2) - pitch2
else:
y = 2 * size2
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y1 = y / 2 - (pitch1 + pitch2) / 2
y2 = y / 2 + (pitch1 + pitch2) / 2
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h = max(size1, size2) + t
b = "F"
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t = "e" # prepare for close box
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mh = self.shaft
def sideCB():
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self.hole(y1, h / 2, mh / 2)
self.hole(y2, h / 2, mh / 2)
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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")
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self.rectangularWall(x, y, "ffff", move="up")
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profile_shift = 20
pressure_angle = 20
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for i in range(self.stages - 1):
self.gears(teeth=self.teeth2, dimension=self.modulus, angle=pressure_angle,
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mount_hole=mh, profile_shift=profile_shift, move="up")
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self.gears(teeth=self.teeth2, dimension=self.modulus, angle=pressure_angle,
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mount_hole=mh, profile_shift=profile_shift, move="right")
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for i in range(self.stages):
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self.gears(teeth=self.teeth1, dimension=self.modulus, angle=pressure_angle,
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mount_hole=mh, profile_shift=profile_shift, move="down")
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