# 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) -> None:
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 teeth 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")
