93 lines
3.7 KiB
Python
93 lines
3.7 KiB
Python
#!/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
|
|
spoke_width = 3*self.shaft
|
|
|
|
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=spoke_width,
|
|
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
|
|
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()
|