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tensioner_clss_new.py
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tensioner_clss_new.py
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import os
import sys
import inspect
import logging
import math
import FreeCAD
import FreeCADGui
import Part
import DraftVecUtils
import kcomp # import material constants and other constants
from NuevaClase import Obj3D
import fc_clss_new
import fcfun # import my functions for freecad. FreeCad Functions
import comps # import my CAD components
import shp_clss
from fcfun import V0, VX, VY, VZ, V0ROT
from fcfun import VXN, VYN, VZN
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)
class BearWashSet(Obj3D):
""" A set of bearings and washers, usually to make idle pulleys
Parameters:
-----------
metric : int
Metric (diameter) of the bolt that holds the set
axis_h : FreeCAD.Vector
vector along the cylinder height
pos_h : int
location of pos along axis_h (0,1,2,3)
0: pos is centered along its height
1: pos is at the base of the bearing
2: pos is at the base of the regular washer
3: pos is at the base of the large washer (this is the bottom)
axis_d : FreeCAD.Vector
vector perpendicular to the axis_h, along the radius
pos_d : int
location of pos along axis_d (0,1,2,3)
0: pos is centered at the cylinder axis
1: pos is at the bearing internal radius (defined by netric)
2: pos is at the bearing external radius
3: pos is at the large washer external radius
axis_w : FreeCAD.Vector
vector perpendicular to the axis_h and axis_d, along the radius
pos_w : int
location of pos along axis_w (0,1,2,3)
0: pos is centered at the cylinder axis
1: pos is at the bearing internal radius (defined by netric)
2: pos is at the bearing external radius
3: pos is at the large washer external radius
group : int
1: make a group
0: leave as individual components
pos : FreeCAD.Vector
Position of the cylinder, taking into account where the center is
Attributes:
-----------
metric : int or float (in case of M2.5) or even str for inches ?
Metric of the washer
pos_o : FreeCAD.Vector
Position of the origin of the shape
h_o : dictionary of FreeCAD.Vector
vectors from the origin to the different points along axis_h
d_o : dictionary of FreeCAD.Vector
vectors from the origin to the different points along axis_d
w_o : dictionary of FreeCAD.Vector
vectors from the origin to the different points along axis_w
h0_cen : int
d0_cen : int
w0_cen : int
indicates if pos_h = 0 (pos_d, pos_w) is at the center along
axis_h, axis_d, axis_w, or if it is at the end.
1 : at the center (symmetrical, or almost symmetrical)
0 : at the end
tot_h : float
Total height of the set: idler pulley
r_in : float
inner radius, the radius of the bearing
r_ext : float
external radius, the radius of the large washer
idler pulley without the washer for the bolt because it is between a holder,
The holder is in dots, not in the group
pos_o is at the center of symmetry: see o in the drawing
axis_h
: pos_h
...:...
: : bolt head
..........:.....:........
: Holder for the pulley group
....._________________...:
|_________________| 3 large washer
|_________| 2 regular washer
| | 1
| o | 0 bearing
|_________| -1
___|_________|___ -2 regular washer
....|_________________|.. -3 large washer
:
.........................: Holder for the pulley group
:.....: nut
:.: bolt shank
01 2 3 pos_d, pos_w
"""
# large washer (din9021) metric
lwash_m_dict = {3: 4, 4: 6}
# regular washer (din125) has the same metric as the pulley
# bearing type
bear_m_dict = {3: 603, 4: 624}
def __init__(self, metric,
axis_h, pos_h,
axis_d=None, pos_d=0,
axis_w=None, pos_w=0,
pos=V0,
group=1,
name=None):
self.pos = FreeCAD.Vector(0, 0, 0)
self.position = pos
if name == None:
name = 'bearing_idlpulley_m' + str(metric)
self.name = name
super().__init__(axis_d, axis_w, axis_h, self.name)
# save the arguments as attributes:
frame = inspect.currentframe()
args, _, _, values = inspect.getargvalues(frame)
for i in args:
if not hasattr(self, i): # so we keep the attributes by CylHole
setattr(self, i, values[i])
try:
# lwash_m is the size (metric) of the large washer
self.lwash_m = self.lwash_m_dict[metric]
# bear_type is the type of bearing, such as 603, 624,...
self.bear_type = self.bear_m_dict[metric]
# lwash_dict is the dictionary with the dimensions of large washer
self.lwash_dict = kcomp.D9021[self.lwash_m]
# rwash_dict is the dictionary with the dimensions of regular washer
self.rwash_dict = kcomp.D125[metric]
# bear is the dictionary with the dimensions of the bearing
self.bear_dict = kcomp.BEARING[self.bear_type]
except KeyError:
logger.error('Bearing/washer key not found: ' + str(metric))
else:
# dimensions of each element
# height, along axis_h
self.lwash_h = self.lwash_dict['t'] # height (thickness)
self.lwash_r_out = self.lwash_dict['do'] / 2.
self.rwash_h = self.rwash_dict['t'] # height (thickness)
self.rwash_r_out = self.rwash_dict['do'] / 2.
self.bear_h = self.bear_dict['t'] # height (thickness)
self.bear_r_out = self.bear_dict['do'] / 2.
# total height:
self.tot_h = 2 * (self.lwash_h + self.rwash_h) + self.bear_h
# inner radius of the pulley, the radius of the bearing
self.r_in = self.bear_r_out
# external radius, the radius of the large washer
self.r_ext = self.lwash_r_out
# pos_h/d/w = 0 are at the center
self.h0_cen = 1
self.d0_cen = 1
self.w0_cen = 1
# the origin (pos_o) is at the center of symmetry
# vectors from o (orig) along axis_h, to the pos_h points
# h_o is a dictionary created in Obj3D.__init__
self.h_o[0] = V0
self.h_o[1] = self.vec_h(-self.bear_h / 2.)
self.h_o[2] = self.vec_h(-self.bear_h / 2. - self.rwash_h)
self.h_o[3] = self.vec_h(- self.bear_h / 2.
- self.rwash_h
- self.lwash_h)
self.d_o[0] = V0
if self.axis_d is not None:
self.d_o[1] = self.vec_d(-metric / 2.)
self.d_o[2] = self.vec_d(-self.bear_r_out)
self.d_o[3] = self.vec_d(-self.lwash_r_out)
elif pos_d != 0:
logger.error('axis_d not defined while pos_d != 0')
self.w_o[0] = V0
if self.axis_d is not None:
self.w_o[1] = self.vec_w(-metric / 2.)
self.w_o[2] = self.vec_w(-self.bear_r_out)
self.w_o[3] = self.vec_w(-self.lwash_r_out)
elif pos_w != 0:
logger.error('axis_w not defined while pos_w != 0')
# calculates the position of the origin, and keeps it in attribute
# pos_o
self.set_pos_o()
# creation of the bearing
bearing = fc_clss_new.BearingOutl(bearing_nb=self.bear_type,
axis_h=self.axis_h,
pos_h=0,
axis_d=self.axis_d,
axis_w=self.axis_w,
pos=self.pos_o,
# pos = rwash_b.get_pos_h(1),
name='idlpull_bearing')
super().append_part(bearing)
# creation of the bottom regular washer
rwash_b = fc_clss_new.Din125Washer(metric=metric,
axis_h=self.axis_h,
pos_h=1,
pos=bearing.get_pos_h(-1),
name='idlpull_rwash_bt')
super().append_part(rwash_b)
# creation of the bottom large washer
lwash_b = fc_clss_new.Din9021Washer(metric=self.lwash_m,
axis_h=self.axis_h,
pos_h=1,
pos=rwash_b.get_pos_h(-1),
name='idlpull_lwash_bt')
super().append_part(lwash_b)
# creation of the top regular washer
rwash_t = fc_clss_new.Din125Washer(metric=metric,
axis_h=self.axis_h,
pos_h=-1,
pos=bearing.get_pos_h(1),
name='idlpull_rwash_tp')
super().append_part(rwash_t)
# creation of the top large washer
lwash_t = fc_clss_new.Din9021Washer(metric=self.lwash_m,
axis_h=self.axis_h,
pos_h=-1,
pos=rwash_t.get_pos_h(1),
name='idlpull_lwash_tp')
super().append_part(lwash_t)
if group == 1:
super().make_group()
# Need to set first in (0,0,0) and after that set the real placement.
# This enable to do rotations without any issue
self.fco.Placement.Base = FreeCAD.Vector(0, 0, 0)
self.fco.Placement.Base = self.position
class Din912BoltWashSet(Obj3D):
""" A din 912 bolt and a wahser set
Parameters:
-----------
metric : int (could be 2.5)
Metric (diameter) of the bolt
shank_l : float
length of the bolt, not including the head
the real length depends on shank_l_adjust
wide_washer : int
0: normal washer (default) din 125
1: wide washer din 9021
shank_l_adjust : int
0: shank length will be the size of the parameter shank_l
-1: shank length will be the size of the closest shorter or equal
to shank_l available lengths for this type of bolts
1: shank length will be the size of the closest larger or equal
to shank_l available lengths for this type of bolts
-2: shank length will be the size of the closest shorter or equal
to shank_l + washer thick available lengths for this type of bolts
available lengths for this type of bolts
2: shank length will be the size of the closest larger or equal
to shank_l + washer thick available lengths for this type of bolts
shank_out : float
0: default
distance to the end of the shank, just for positioning, it doesn't
change shank_l
I don't think it is necessary, but just in case
head_out : float
0: default
distance to the end of the head, just for positioning, it doesn't
change head_l
I don't think it is necessary, but just in case
axis_h : FreeCAD.Vector
vector along the bolt axis
axis_d : FreeCAD.Vector
vector along the radius, a direction perpendicular to axis_h
if head is hexagonal or the socket, it will point the direction of a
vertex
axis_w : FreeCAD.Vector
vector along the other radius, a direction perpendicular to axis_h
and axis_d
it is not necessary if pos_w == 0
It can be None
pos_h : int
location of pos along axis_h
0: top of the head, considering head_out,
1: position of the head not considering head_out
if head_out = 0, it will be the same as pos_h = 0
2: union of the head and the shank, beginning of the washer
3: end of the washer
4: where the screw starts, if all the shank is screwed, it will be
the same as pos_h = 2
5: end of the shank, not considering shank_out
6: end of the shank, if shank_out = 0, will be the same as pos_h = 5
6: top of the head, considering xtr_head_l, if xtr_head_l = 0
will be the same as pos_h = 0
pos_d : int
location of pos along axis_d (symmetric)
0: pos is at the central axis
1: radius of the shank
2: radius of the head
3: outer radius of the washer
pos_w : int
location of pos along axis_d (symmetric)
0: pos is at the central axis
1: radius of the shank
2: radius of the head
3: outer radius of the washer
axis_w : FreeCAD.Vector
vector perpendicular to the axis_h and axis_d, along the radius
pos_w : int
location of pos along axis_w (0,1,2,3)
0: pos is centered at the cylinder axis
1: pos is at the bearing internal radius (defined by netric)
2: pos is at the bearing external radius
3: pos is at the large washer external radius
group : int
1: make a group
0: leave as individual components
pos : FreeCAD.Vector
Position of the cylinder, taking into account where the center is
axis_h
:
: shank_r
:+
: :
: :
....6......... _:_:...................
shank_out+....5.........| : | : :
| : | + thread_l :
| : | : :
| : | : :
| : | : + shank_l
4 |.:.|....: :
| : | :
| : | :
.... 3 _______|_:_|_______ :
washer_thick : | :: : :: | :
:... 2 |______::_:_::______|..........:
| : | :
| ..:.. | + head_l
...1......| : : : | :
head_out+...0......|__:_:_:__|...............:.... axis_d
0 1 2 3
: : :
:....: :
: + :
: head_r :
: :
:.........:
+ washer_ro
"""
def __init__(self, metric,
shank_l,
wide_washer=0,
shank_l_adjust=0,
shank_out=0,
head_out=0,
axis_h=VZ,
axis_d=None, axis_w=None,
pos_h=0, pos_d=0, pos_w=0,
pos=V0,
group=1, # 1: make a group
name=None):
if name == None:
name = 'd912bolt_washer_m' + str(int(metric))
self.name = name
self.pos = FreeCAD.Vector(0, 0, 0)
self.position = pos
Obj3D.__init__(self, axis_d, axis_w, axis_h, self.name)
frame = inspect.currentframe()
args, _, _, values = inspect.getargvalues(frame)
for i in args:
if not hasattr(self, i): # so we keep the attributes by CylHole
setattr(self, i, values[i])
self.bolt_dict = kcomp.D912[metric]
if wide_washer == 0:
self.washer_dict = kcomp.D125[metric]
else:
self.washer_dict = kcomp.D9021[metric]
self.washer_thick = self.washer_dict['t']
self.washer_do = self.washer_dict['do']
self.washer_ro = self.washer_do / 2.
if shank_l_adjust == 0:
self.shank_l = shank_l
else:
sh_l_list = self.bolt_dict['shank_l_list']
if shank_l_adjust == -1: # smaller closest to shank_l
self.shank_l = [sh_l for sh_l in sh_l_list if sh_l <= shank_l][-1]
elif shank_l_adjust == 1: # larger closest to shank_l
self.shank_l = [sh_l for sh_l in sh_l_list if sh_l >= shank_l][0]
elif shank_l_adjust == -2: # smaller closest to shank_l, washer
self.shank_l = [sh_l for sh_l in sh_l_list
if sh_l <= shank_l + self.washer_thick][-1]
elif shank_l_adjust == 2: # larger closest to shank_l + washer_thick
self.shank_l = [sh_l for sh_l in sh_l_list
if sh_l >= shank_l + self.washer_thick][0]
else:
logger.error('wrong value for parameter shank_l_adjust')
self.shank_l = shank_l
if self.bolt_dict['thread'] > self.shank_l:
self.thread_l = self.shank_l
else:
self.thread_l = self.bolt_dict['thread']
self.shank_r = metric / 2.
self.head_l = self.bolt_dict['head_l']
self.head_r = self.bolt_dict['head_r']
self.h0_cen = 0
self.d0_cen = 1 # symmetrical
self.w0_cen = 1 # symmetrical
self.tot_l = self.head_l + self.shank_l
# vectors from o (orig) along axis_h, to the pos_h points
# h_o is a dictionary created in Obj3D.__init__
self.h_o[0] = V0 # origin
self.h_o[1] = self.vec_h(head_out)
self.h_o[2] = self.vec_h(self.head_l)
self.h_o[3] = self.vec_h(self.head_l + self.washer_thick)
self.h_o[4] = self.vec_h(self.tot_l - self.thread_l)
self.h_o[5] = self.vec_h(self.tot_l - shank_out)
self.h_o[6] = self.vec_h(self.tot_l)
self.d_o[0] = V0
if not (self.axis_d is None or self.axis_d == V0):
# negative because is symmetric
self.d_o[1] = self.vec_d(-self.shank_r)
self.d_o[2] = self.vec_d(-self.head_r)
self.d_o[3] = self.vec_d(-self.washer_ro)
elif pos_d != 0:
logger.error('axis_d not defined while pos_d != 0')
self.w_o[0] = V0
if not (self.axis_w is None or self.axis_w == V0):
# negative because is symmetric
self.w_o[1] = self.vec_w(-self.shank_r)
self.w_o[2] = self.vec_w(-self.head_r)
self.w_o[3] = self.vec_w(-self.washer_ro)
elif pos_w != 0:
logger.error('axis_w not defined while pos_w != 0')
self.set_pos_o()
# creation of the bolt, at the origin self.pos_o:
bolt = fc_clss_new.Din912Bolt(metric=metric,
shank_l=self.shank_l,
shank_out=shank_out,
head_out=head_out,
axis_h=self.axis_h,
axis_d=self.axis_d,
axis_w=self.axis_w,
pos_h=0, pos_d=0, pos_w=0,
pos=self.pos_o,
name=None)
self.append_part(bolt)
# creation of the washer, at the origin at pos_h = 2, and at the end
# of the washer, could use an if
if wide_washer == 0:
washer = fc_clss_new.Din125Washer(metric=metric,
axis_h=self.axis_h,
pos_h=-1, # base of cylinder
pos=self.get_pos_h(2),
name=None)
else:
washer = fc_clss_new.Din9021Washer(metric=metric,
axis_h=self.axis_h,
pos_h=-1, # base of cylinder
pos=self.get_pos_h(2),
name=None)
self.append_part(washer)
if group == 1:
super().make_group()
# Need to set first in (0,0,0) and after that set the real placement.
# This enable to do rotations without any issue
self.fco.Placement.Base = FreeCAD.Vector(0, 0, 0)
self.fco.Placement.Base = self.position
class Din934NutWashSet(Obj3D):
""" A din 934 nut and a wahser set
Parameters:
-----------
metric : int (could be 2.5)
Metric (diameter) of the bolt
wide_washer : int
0: normal washer (default) din 125
1: wide washer din 9021
axis_d_apo : int
0: default: axis_d points to the vertex
1: axis_d points to the center of a side
axis_h : FreeCAD.Vector
vector along the bolt axis
axis_d : FreeCAD.Vector
vector along the first vertex, a direction perpendicular to axis_h
it is not necessary if pos_d == 0
It can be None, but if None, axis_w has to be None
vector along the radius, a direction perpendicular to axis_h
axis_w : FreeCAD.Vector
vector along the other radius, a direction perpendicular to axis_h
and axis_d
it is not necessary if pos_w == 0
It can be None
pos_h : int
location of pos along axis_h
0: at the base of the washer
1: end of the washer, beginning of the nut
2: end of the nut
pos_d : int
location of pos along axis_d (symmetric)
0: pos is at the central axis
1: radius of the hole
2: apotheme
3: circumradius
4: radius of the washer
pos_w : int
location of pos along axis_d (symmetric)
0: pos is at the central axis
1: radius of the hole
2: apotheme
3: circumradius
4: radius of the washer
group : int
1: make a group
0: leave as individual components
pos : FreeCAD.Vector
Position of the cylinder, taking into account where the center is
axis_h
:
: metric/2
:+
: :
: :
2 ____:____ :
| : | : | + head_l
| : | : | :
.... 1 ____|__:_:_:__|____ :
washer_thick : | : : : | :
:... 0 |_______:_:_:_______|...........axis_d
0 1 23 4
: : :
:....: :
: + :
: head_r :
: :
:.........:
+ washer_ro
"""
def __init__(self, metric,
wide_washer=0,
axis_d_apo=0,
axis_h=VZ,
axis_d=None, axis_w=None,
pos_h=0, pos_d=0, pos_w=0,
pos=V0,
group=1, # 1: make a group
name=None):
self.pos = FreeCAD.Vector(0, 0, 0)
self.position = pos
if name == None:
name = 'd934' + str(int(metric))
self.name = name
Obj3D.__init__(self, axis_d, axis_w, axis_h, name)
frame = inspect.currentframe()
args, _, _, values = inspect.getargvalues(frame)
for i in args:
if not hasattr(self, i): # so we keep the attributes by CylHole
setattr(self, i, values[i])
self.nut_dict = kcomp.D934[metric]
self.nut_h = self.nut_dict['l']
self.nut_ro = self.nut_dict['circ_r']
# either or the next, not exact
# self.nut_apo = self.nut_dict['a2']/2.
self.nut_apo = self.nut_ro * 0.866 # cos 30
if wide_washer == 0:
self.washer_dict = kcomp.D125[metric]
else:
self.washer_dict = kcomp.D9021[metric]
self.washer_thick = self.washer_dict['t']
self.washer_do = self.washer_dict['do']
self.washer_ro = self.washer_do / 2.
self.h0_cen = 0
self.d0_cen = 1 # symmetrical
self.w0_cen = 1 # symmetrical
self.tot_h = self.nut_h + self.washer_thick
# vectors from o (orig) along axis_h, to the pos_h points
# h_o is a dictionary created in Obj3D.__init__
self.h_o[0] = V0 # origin
self.h_o[1] = self.vec_h(self.washer_thick)
self.h_o[2] = self.vec_h(self.washer_thick + self.nut_h)
self.d_o[0] = V0
if not (self.axis_d is None or self.axis_d == V0):
# negative because is symmetric
self.d_o[1] = self.vec_d(-metric / 2.)
self.d_o[2] = self.vec_d(-self.nut_apo)
self.d_o[3] = self.vec_d(-self.nut_ro)
self.d_o[4] = self.vec_d(-self.washer_ro)
elif pos_d != 0:
logger.error('axis_d not defined while pos_d != 0')
self.w_o[0] = V0
if not (self.axis_w is None or self.axis_w == V0):
# negative because is symmetric
self.w_o[1] = self.vec_w(-metric / 2.)
self.w_o[2] = self.vec_w(-self.nut_apo)
self.w_o[3] = self.vec_w(-self.nut_ro)
self.w_o[4] = self.vec_w(-self.washer_ro)
elif pos_w != 0:
logger.error('axis_w not defined while pos_w != 0')
self.set_pos_o()
# creation of the nut, at pos h = 1
nut = fc_clss_new.Din934Nut(metric=metric,
axis_d_apo=axis_d_apo,
axis_h=self.axis_h,
axis_d=self.axis_d,
axis_w=self.axis_w,
pos_h=-1, pos_d=0, pos_w=0,
pos=self.get_pos_h(1),
name=None)
self.append_part(nut)
# creation of the washer, at the origin , and at the end
# of the washer, could use an if
if wide_washer == 0:
washer = fc_clss_new.Din125Washer(metric=metric,
axis_h=self.axis_h,
pos_h=-1, # base of cylinder
pos=self.pos_o,
name=None)
else:
washer = fc_clss_new.Din9021Washer(metric=metric,
axis_h=self.axis_h,
pos_h=-1, # base of cylinder
pos=self.pos_o,
name=None)
self.append_part(washer)
self.place_fcos()
if group == 1:
super().make_group()
# Need to set first in (0,0,0) and after that set the real placement.
# This enable to do rotations without any issue
self.fco.Placement.Base = FreeCAD.Vector(0, 0, 0)
self.fco.Placement.Base = self.position
class IdlerTensioner(Obj3D):
""" Creates the idler pulley tensioner shape
nut_space
.+..
: :
nut_holder_thick: :nut_holder_thick
+: :+
: : : : pulley_stroke_dist
: : : : : .+.
: : : : : : : idler_r_ext
: : : : : : :.+..
: : : : : : : : idler_r_int
: : : : : : : :.+...
: : : : : : : : :
________ : :__:_:_______:_:___:____:..................
|___::___| / ____ __:_:___|.....+wall_thick :
| ....| | __ / \ | : + tens_h
| ()...| |:| |:| | | + idler_h :
|________| | -- \_____/ |________....: :
|___::___| \__________________:_:___|.................:
: : : : : :
:........: : :...+...: :
+ :......: tens_stroke :
tens_w : + :
(2*idler_r_int) : nut_holder_tot :
: :
:.........tens_d..........:
pos_h
________ ________________________
|___::___| / ____ ___::___|
| ....| | __ / \ |
| ()...| 0 o:| |:| | | -----> axis_d
|________| 1 | -- \_____/ |________
|___::___| 2 \___________________::___|
1 0 0 1 2 3 4 5 : pos_d
pos_w
pos_o (origin) is at pos_d=0, pos_w=0, pos_h=0, It marked with o
Parameters:
-----------
wall_thick : float
Thickness of the walls
tens_stroke : float
Length of the idler tensioner body, the stroke. Not including the pulley
neither the space for the tensioner bolt
pulley_stroke_dist : float
Distance along axis_d from between the end of the pulley and the stroke
Not including the pulley. See picture dimensions
if 0: it will be the same as wall_thick
nut_holder_thick : float
Length of the space along axis_d above and below the nut, for the bolt
in_fillet: float
radius of the inner fillets
idler_h : float
height of the idler pulley
idler_r_in : float
internal radius of the idler pulley. This is the radius of the surface
where the belt goes
idler_r_ext : float
external radius of the idler pulley. This is the most external part of
the pulley (for example the radius of the large washer)
boltidler_mtr : integer (could be float 2.5)
diameter (metric) of the bolt for the idler pulley
bolttens_mtr : integer (could be float 2.5)
diameter (metric) of the bolt for the tensioner
opt_tens_chmf : int
1: there is a chamfer at every edge of tensioner, inside the holder
0: there is a chamfer only at the edges along axis_w, not along axis_h
tol : float
Tolerances to print
axis_d : FreeCAD.Vector
length vector of coordinate system
axis_w : FreeCAD.Vector
width vector of coordinate system
if V0: it will be calculated using the cross product: axis_d x axis_h
axis_h : FreeCAD.Vector
height vector of coordinate system
pos_d : int
location of pos along the axis_d (0,1,2,3,4,5), see drawing
0: at the back of the holder
1: at the beginning of the hole for the nut (position for the nut)
2: at the beginning of the tensioner stroke hole
3: at the end of the tensioner stroke hole
4: at the center of the idler pulley hole
5: at the end of the piece
pos_w : int
location of pos along the axis_w (0,1) almost symmetrical
0: at the center of symmetry
1: at the end of the piece along axis_w at the negative side
pos_h : int
location of pos along the axis_h (0,1,2), symmetrical
0: at the center of symmetry
1: at the inner base: where the base of the pulley goes
2: at the bottom of the piece (negative side of axis_h)
pos : FreeCAD.Vector
Position of the cylinder, taking into account where the center is
Attributes:
-----------
All the parameters and attributes of parent class SinglePart
Dimensional attributes:
tens_d : float
total length (depth) of the idler tensioner
tens_w : float
total width of the idler tensioner
tens_h : float
total height of the idler tensioner
tens_d_inside : float
length (depth) of the idler tensioner that can be inside the holder
prnt_ax : FreeCAD.Vector
Best axis to print (normal direction, pointing upwards)
d0_cen : int
w0_cen : int
h0_cen : int
indicates if pos_h = 0 (pos_d, pos_w) is at the center along
axis_h, axis_d, axis_w, or if it is at the end.
1 : at the center (symmetrical, or almost symmetrical)
0 : at the end
"""
def __init__(self,
idler_h,
idler_r_in,
idler_r_ext,
in_fillet=2.,
wall_thick=5.,
tens_stroke=20.,
pulley_stroke_dist=0,
nut_holder_thick=4.,
boltidler_mtr=3,
bolttens_mtr=3,
opt_tens_chmf=1,
tol=kcomp.TOL,
axis_d=VX,
axis_w=VY,
axis_h=VZ,
pos_d=0,
pos_w=0,
pos_h=0,
pos=V0,
name='IdlerTensioner'):
Obj3D.__init__(self, axis_d, axis_w, axis_h, name)
self.pos = FreeCAD.Vector(0, 0, 0)
self.position = pos
# save the arguments as attributes:
frame = inspect.currentframe()
args, _, _, values = inspect.getargvalues(frame)
for i in args:
if not hasattr(self, i):
setattr(self, i, values[i])
# calculation of the dimensions:
if pulley_stroke_dist == 0: # default value
self.pulley_stroke_dist = wall_thick
# dictionary of the bolt for the idler pulley
# din 912 bolts are used:
self.boltidler_dict = kcomp.D912[boltidler_mtr]
self.boltidler_r_tol = self.boltidler_dict['shank_r_tol']
# --- tensioner bolt and nut values
# dictionary of the bolt tensioner
self.bolttens_dict = kcomp.D912[bolttens_mtr]
# the shank radius including tolerance
self.bolttens_r_tol = self.bolttens_dict['shank_r_tol']
# dictionary of the nut
self.nuttens_dict = kcomp.D934[bolttens_mtr]
self.nut_space = kcomp.NUT_HOLE_MULT_H + self.nuttens_dict['l_tol']
self.nut_holder_tot = self.nut_space + 2 * nut_holder_thick
# circum diameter of the nut
self.tensnut_circ_d = self.nuttens_dict['circ_d']
# circum radius of the nut, with tolerance
self.tensnut_circ_r_tol = self.nuttens_dict['circ_r_tol']
# the apotheme of the nut
self.tensnut_ap_tol = (self.nuttens_dict['a2'] + tol / 2.) / 2.
# --- idler tensioner dimensions
self.tens_h = idler_h + 2 * wall_thick
self.tens_d = (self.nut_holder_tot
+ tens_stroke
+ self.pulley_stroke_dist
+ idler_r_ext
+ idler_r_in)
self.tens_d_inside = (self.nut_holder_tot
+ tens_stroke
+ self.pulley_stroke_dist)
self.tens_w = max(2 * idler_r_in, self.tensnut_circ_d)
self.d0_cen = 0
self.w0_cen = 1 # symmetrical
self.h0_cen = 1 # symmetrical
self.d_o[0] = V0
self.d_o[1] = self.vec_d(nut_holder_thick)
self.d_o[2] = self.vec_d(self.nut_holder_tot)
self.d_o[3] = self.vec_d(self.nut_holder_tot + tens_stroke)
self.d_o[4] = self.vec_d(self.tens_d - idler_r_in)
self.d_o[5] = self.vec_d(self.tens_d)
# these are negative because actually the pos_w indicates a negative
# position along axis_w
self.w_o[0] = V0
self.w_o[1] = self.vec_w(-self.tens_w / 2.)
self.h_o[0] = V0
self.h_o[1] = self.vec_h(-idler_h / 2.)
self.h_o[2] = self.vec_h(-self.tens_h / 2.)
# calculates the position of the origin, and keeps it in attribute pos_o
self.set_pos_o()
# ------------- building of the piece --------------------
# --------------- step 01-04 ------------------------
# rectangular cuboid with basic dimensions, but chamfered
# at the inner end
#
# axis_h
# : .....tens_d.......
# : : ________________:
# : / /|
# / / |
# .. /_______________/ |.......
# : / | / .
# tens_h | | / . tens_w
# :. \_______________|/......
#
#
# o: shows the position of the origin: pos_o
#
# axis_h axis_h
# : :
# .... ____:____ : ______________________
# : |.........| ch2/ |
# : |: :| | |
# tens_h + |: o :| o |-----> axis_d
# : |:.......:| | |
# :...|_________| ch1\______________________|
# : : : :
# :.tens_h..: :...... tens_d .........:
#
# ____o____ ....> axis_w
# ch3/_________\ch4
# | | chamfer ch3 and ch4 are optional
# | | Depending on opt_tens_chmf
# | |
# | |
# | |
# | |
# |.........|
# | |
# | |
# | |
# |_________|
# :
# :
# V
# axis_d
if opt_tens_chmf == 0: # no optional chamfer, only along axis_w
edge_dir = self.axis_w
else:
edge_dir = V0
shp01chmf = fcfun.shp_boxdir_fillchmfplane(box_w=self.tens_w,
box_d=self.tens_d,
box_h=self.tens_h,
axis_d=self.axis_d,
axis_h=self.axis_h,
cd=0, cw=1, ch=1,
# no tolerances, this is the piece
fillet=0, # chamfer
radius=2 * in_fillet,
plane_fill=self.axis_d.negative(),
both_planes=0,
edge_dir=edge_dir,
pos=self.pos_o)
super().add_child(shp01chmf, 1, 'shp01chmf')
# --------------- step 02 ---------------------------
# Space for the idler pulley
# axis_h
# :
# : ______________________
# / _______|....
# | | + idler_h
# | | 5 :----------->axis_d