def idler_tens ():
# bring the active document
doc = FreeCAD.ActiveDocument
# --------------- step 01 ---------------------------
# rectangular cuboid with basic dimensions
#
# Z
# :.....tens_l.......
# :_________________:
# / /|
# / / |
# ../________________/ |..............Y .
# : | | / .
# tens_h | | / . tens_w
# :.|________________|/......
# .
# .
# X
#
# oscad: cube([tens_w, tens_l, tens_h]);
# creates the shape, you don't see it yet on FreeCAD Gui
shp01 = fcfun.shp_boxcen(kidler.tens_w, kidler.tens_l, kidler.tens_h)
# creates a freecad object from the shape, to see it in FreeCAD Gui,
# not necessary, but illustrative for this tutorial
fcd01 = fcfun.add_fcobj(shp01, 'box01')
# --------------- step 02 ---------------------------
# Space for the idler pulley
# Z
# :
# :_______________________
# | ______|....
# | / + idler_h
# | | :
# | \______....:
# |_______________________|...wall_thick.......> Y
# : :
# :.......:
# +
# 2 * idler_r_xtr
#
# oscad: translate ([-1, tens_l - 2*idler_r_xtr, wall_thick])
# ...
pos02 = FreeCAD.Vector(-1,
kidler.tens_l - 2*kidler.idler_r_xtr,
kidler.wall_thick)
# oscad: cube([tens_w+2, 2 * idler_r_xtr +1, idler_h]);
# ...
# creates the shape already filleted on X, make it larger on Y to make
# the chamfer easier, so all X edges are chamfered, but since is larger
# on Y, it doesnt matter. y dimensions
shp02cut = fcfun.shp_boxcenfill(
x = kidler.tens_w+2,
# in_fillet added
y = 2 * kidler.idler_r_xtr +1 + kidler.in_fillet,
z = kidler.idler_h,
fillrad = kidler.in_fillet,
fx = True, fy = False, fz = False, # chamfer on X
pos = pos02)
fcd02cut = fcfun.add_fcobj(shp02cut, 'cut02')
# difference (cut) of fcd01 and fcd02cut
fcd02 = doc.addObject("Part::Cut", 'step02')
fcd02.Base = fcd01
fcd02.Tool = fcd02cut
# the shape
shp02 = fcd02.Shape
doc.recompute()
# --------------- step 03 ---------------------------
# Fillets at the idler end:
# Z
# :
# :_______________________f2
# | ______|
# | / f4
# | |
# | \______f3...
# |_______________________|....+ wall_thick.....> Y
# : f1
# :...... tens_l .........:
#
fcd03 = fcfun.filletchamfer (fcd02, e_len = kidler.tens_w,
name = 'step03',
fillet = 1,
radius = kidler.in_fillet,
axis = 'x', # axis to fillet
ypos_chk = 1,
ypos = kidler.tens_l) #fillet on y=tens_l
# --------------- step 04 ---------------------------
# Chamfers at the nut end:
# Z
# :
# : ______________________
# ch2/ ______|
# | /
# | |
# | \______
# ch1\______________________|.............> Y
# : :
# :...... tens_l .........:
#
fcd04a = fcfun.filletchamfer (fcd03, e_len = 0,
name = 'step04a',
fillet = 0, # chamfer
radius = 2* kidler.in_fillet,
axis = 'x', # axis to fillet
ypos_chk = 1,
ypos = 0) #fillet on y=0
# --------------- step 04b OPTIONAL----------------------
# Chamfers at the nut end on axis Z, they are 45 degrees
# so they should print ok without support, but you may
# not want to have them
# ________ ....> X
# ch1/________\ch2
# | |
# | |
# | |
# | |
# | |
# | |
# |........|
# | |
# | |
# | |
# |________|
# :
# Y
#
#
if (kidler.opt_tens_chmf == 1) : # optional tensioner chamfer
fcd04 = fcfun.filletchamfer (fcd04a, e_len = 0,
name = 'step04b',
fillet = 0, # chamfer
radius = 2* kidler.in_fillet,
axis = 'z', # axis to fillet
ypos_chk = 1,
ypos = 0) #fillet on y=0
else:
# just to have the same freecad object at the end of step 4 in fcd04
fcd04 = fcd04a
# --------------- step 05 ---------------------------
# Shank hole for the idler pulley:
# Z idler_r_xtr
# : .+..
# : ___________________:__:
# / __:_:_|
# | /
# | |
# | \______
# \__________________:_:_|.............> Y
# : :
# :...... tens_l .........:
#
#oscad: translate ([tens_w/2., tens_l - idler_r_xtr, -1])
#oscad: cylinder (r=boltidler_r_tol, h= tens_w +2, $fa=1, $fs=0.5);
pos05 = FreeCAD.Vector(kidler.tens_w/2.,
kidler.tens_l - kidler.idler_r_xtr,
-1)
fcd05 = fcfun.addCylPos (r = kidler.boltidler_r_tol,
h = kidler.tens_h +2,
name = 'step05',
pos = pos05)
fcd05.ViewObject.ShapeColor = fcfun.YELLOW #yellow color
# we will make the cut at the end with the other cuts
# --------------- step 06 ---------------------------
# Hole for the leadscrew (stroke):
# Z
# :
# : ______________________
# / _____ __:_:_|
# | f2/ \f4 /
# | | | |
# | f1\_____/f3 \______
# \__________________:_:_|.............> Y
# : : : :
# : :.......: :
# : : + :
# :.....: tens_stroke :
# : + :
# : nut_holder_total :
# : :
# :...... tens_l .........:
#
# Space for screw (the stroke)
#oscad: translate ([-1, nut_holder_total,wall_thick])
pos06 = FreeCAD.Vector (-1,
kidler.nut_holder_total,
kidler.wall_thick)
# shape of a box with fillet in all the X edges
#oscad: cube([tens_w+2, tens_stroke, idler_h]);
shp06 = fcfun.shp_boxcenchmf (x = kidler.tens_w+2,
y = kidler.tens_stroke,
z = kidler.idler_h,
chmfrad = kidler.in_fillet,
fx = True,
fz = False,
pos = pos06)
fcd06 = fcfun.add_fcobj(shp06, 'step06')
fcd06.ViewObject.ShapeColor = fcfun.ORANGE
# --------------- step 07 ---------------------------
# Hole for the leadscrew shank at the beginning
# Z
# :
# : ______________________
# / _____ __:_:_|
# | / \ /
# |:::::| | |
# | \_____/ \______
# \__________________:_:_|.............> Y
# : : :
# : : :
# : : :
# :.....: :
# : + :
# : nut_holder_total :
# : :
# :...... tens_l .........:
#
#oscad: translate ([tens_w/2, -1, tens_h/2])
pos07 = FreeCAD.Vector(kidler.tens_w/2,
-1,
kidler.tens_h/2)
#oscad:rotate ([-90,0,0])
#oscad: cylinder (r=bolttens_r_tol, h=nut_holder_total+2,$fa=1, $fs=0.5);
fcd07 = fcfun.addCylPos (r = kidler.bolttens_r_tol,
h = kidler.nut_holder_total +2.,
name = 'step07',
normal = fcfun.VY, #on the positive y axis
pos = pos07)
fcd07.ViewObject.ShapeColor = fcfun.RED
# --------------- step 08 ---------------------------
# Hole for the leadscrew nut
# Z
# :
# : ______________________
# / _____ __:_:_|
# | _ / \ /
# |:|_|:| | |
# | \_____/ \______
# \__________________:_:_|.............> Y
# : : : :
# :+ : :
# :nut_holder_thick :
# :.....: :
# : + :
# : nut_holder_total :
# : :
# :...... tens_l .........:
#oscad: tens_w/2-1 to have more tolerance, so it is a little bit deeper
#oscad: translate ([tens_w/2-1, nut_holder_thick, tens_h/2])
# dont need to have tens_w/2-1, because there is xtr argument for that
pos08 = FreeCAD.Vector (kidler.tens_w/2.,
kidler.nut_holder_thick,
kidler.tens_h/2.)
#oscad: cylinder (r=m4_nut_r_tol+stol, h = nut_space, $fn=6);
#oscad: cube([tens_w/2 + 2, nut_space, 2*m4_nut_ap_tol]);
shp08 = fcfun.shp_nuthole (nut_r = kidler.tensnut_circ_r_tol,
nut_h = kidler.nut_space,
hole_h = kidler.tens_w/2,
xtr_nut = 1, xtr_hole = 1,
# on the Y direction
fc_axis_nut = FreeCAD.Vector(0,1,0),
# on the X direction
fc_axis_hole = FreeCAD.Vector(1,0,0),
ref_nut_ax = 2, # pos not centered on axis nut
# pos at center of nut on axis hole
ref_hole_ax = 1,
pos = pos08)
fcd08 = fcfun.add_fcobj(shp08, 'step08')
fcd08.ViewObject.ShapeColor = fcfun.GREEN
# --------- step 09:
# --------- Last step, union and cut of the steps 05, 06, 07, 08
fcd09cut = doc.addObject("Part::MultiFuse", "step09cut")
fcd09cut.Shapes = [fcd05,fcd06,fcd07,fcd08]
fcd09final = doc.addObject("Part::Cut", "idler_tensioner")
fcd09final.Base = fcd04
fcd09final.Tool = fcd09cut
doc.recompute()
return fcd09final
def nemamotor_holder():
# --------------- step 01 ---------------------------
# rectangular cuboid with basic dimensions
#
# Z
# :
# :
# :.....tot_w.......
# :______:__________:
# / /|
# / / |
# / / |
# / / |
# ../________________/ |
# : | | |
# : | | |...............Y
# : | | / .
# tot_h: | | / . tot_d
# : | | / .
# :.|________________|/......
# .
# .
# X
#
# creates the shape, you don't see it yet on FreeCAD Gui
# centered along axis Y
shp01 = fcfun.shp_boxcen(tot_d, tot_w, tot_h, cy=True)
# creates a freecad object from the shape, to see it in FreeCAD Gui,
# not necessary, but illustrative for this tutorial
fcd01 = fcfun.add_fcobj(shp01, 'box01')
# --------------- step 02 ---------------------------
# chamfering the 4 vertical edges (marked with H)
#
# Z
# :
# :
# :.....tot_w.......
# :______:__________:
# / /H chamfering
# / / H
# / / H
# / / H
# ../________________/ H
# : H H H
# : H H H...............Y
# : H H / .
# tot_h: H H / . tot_d
# : H H / .
# :.H________________H/......
# .
# .
# X
#
fcd02 = fcfun.filletchamfer(
fcd01,
e_len=tot_h,
name='step02',
fillet=0,
radius=chmf_r,
axis='z' # axis to fillet
)
# --------------- step 03 ---------------------------
# Horizontal chamfering the top edge to make a 'triangular' reinforcement
#
# Z
# :
# :___ . chmf_pos
# | \
# | \
# | \
# | \
# | \
# | \
# |________________.....X
#
#
# the radius is the smaller part
chmf_reinf_r = min(tot_d - wall_thick, tot_h - motor_thick)
fcd03 = fcfun.filletchamfer(
fcd02,
e_len=0,
name='step03',
fillet=0,
radius=chmf_reinf_r,
axis='y', # axis to fillet
xpos_chk=1,
zpos_chk=1,
xpos=tot_d, # position of the edge in x
zpos=tot_h # position of the edge in z
)
# --------------- step 04 ---------------------------
# Hole for the motor
#
# Z Z
# : :
# ________:_________ :__
# | | | | | : \
# | | | | | : \
# | | | | | : \
# | | | | | : \
# | | | | | : \
# | | | | | : \
# |_|______________|_| | :..............\...motor_thick
# |_|______________|_|..Y |_________________\..X
# : : : :
# : : : :
# reinf_thick wall_thick
pos04 = FreeCAD.Vector(wall_thick, 0, motor_thick)
shp04cut = fcfun.shp_boxcen(tot_d,
tot_w - 2 * reinf_thick,
tot_h,
cy=True,
pos=pos04)
# creates a freecad object from the shape, to see it in FreeCAD Gui,
# not necessary, but illustrative for this tutorial
fcd04cut = fcfun.add_fcobj(shp04cut, 'motorhole')
# difference (cut) of fcd01 and fcd02cut
fcd04 = doc.addObject("Part::Cut", 'step04')
fcd04.Base = fcd03
fcd04.Tool = fcd04cut
# the shape
shp04 = fcd04.Shape
doc.recompute()
# --------------- step 05 ---------------------------
# Holes for motor bolts, and the central hole
#
# ____________________...............................>Y
# | ___________________|.. wall_thick
# | | | |.. motor_xtr_space.....
# | | O __ O | | -- :motor_w/2
# | | / \ | | . :
# | | | 1 | | | .+ motor_bolt_sep ---
# | | \ / | | .
# | | O __ O | | --
# |_|________________|_| ..... wall_thick
# : : :
# : reinf_thick
# : X :
# : :
# : :
# motor_bolt_sep
# position of the motor axis z=-1 to do the cut
pos05 = FreeCAD.Vector(wall_thick + motor_xtr_space + motor_w / 2., 0, -1)
shp05cenhole = fcfun.shp_cyl(
r=motor_hole_r,
h=motor_thick + 2, # for the cut
normal=fcfun.VZ,
pos=pos05)
# make a list of the bolt holes
boltholes_shp_list = []
# the four motor holes
for x_side in [-1, 1]:
for y_side in [-1, 1]:
hole_pos = pos05 + FreeCAD.Vector(x_side * motor_bolt_sep / 2.,
y_side * motor_bolt_sep / 2., 0)
shp05bolthole = fcfun.shp_cyl(
r=motor_bolt_r_tol,
h=motor_thick + 2, # for the cut
normal=fcfun.VZ,
pos=hole_pos)
boltholes_shp_list.append(shp05bolthole)
# fuse the 5 holes
shp05cut = shp05cenhole.multiFuse(boltholes_shp_list)
# not necessary to create a FreeCAD object, but illustrative for tutorial
fcd05cut = fcfun.add_fcobj(shp05cut, 'boltholes')
# difference (cut) of fcd04 and fcd05cut
fcd05 = doc.addObject("Part::Cut", 'step05')
fcd05.Base = fcd04
fcd05.Tool = fcd05cut
# the shape
shp05 = fcd05.Shape
doc.recompute()
# --------------- step 06 ---------------------------
# Rails to attach the holder
#
# Z
# :
# ________:_________
# | | | |
# | | || || | |-----------------------
# | | || || | | :
# | | || || | | +motor_max_h
# | | || || | | :
# | | || || | |------- :
# |_|______________|_|.......:+ motor_min_h..:
# |_|______________|_|....:+motor_thick............Y
# : :
# :.........:
# bolt_wall_sep
shp06_cut_list = []
for y_side in [-1, 1]:
# the rails
step06_bot_pos = FreeCAD.Vector(-1, y_side * bolt_wall_sep / 2.,
motor_thick + motor_min_h)
shp06_rail = fcfun.shp_boxcen(wall_thick + 2,
2 * bolt_wall_r_tol,
motor_max_h - motor_min_h,
cy=True,
pos=step06_bot_pos)
shp06_cut_list.append(shp06_rail)
# bottom end circle:
shp06_hole = fcfun.shp_cyl(
r=bolt_wall_r_tol,
h=wall_thick + 2, # for the cut
normal=fcfun.VX,
pos=step06_bot_pos)
shp06_cut_list.append(shp06_hole)
step06_top_pos = FreeCAD.Vector(-1, y_side * bolt_wall_sep / 2.,
motor_thick + motor_max_h)
# top end circle:
shp06_hole = fcfun.shp_cyl(
r=bolt_wall_r_tol,
h=wall_thick + 2, # for the cut
normal=fcfun.VX,
pos=step06_top_pos)
shp06_cut_list.append(shp06_hole)
# fuse the rails
shp06cut = fcfun.fuseshplist(shp06_cut_list)
# not necessary to create a FreeCAD object, but illustrative for tutorial
fcd06cut = fcfun.add_fcobj(shp06cut, 'rails')
# difference (cut) of fcd04 and fcd05cut
fcd06 = doc.addObject("Part::Cut", 'step06')
fcd06.Base = fcd05
fcd06.Tool = fcd06cut
# the shape
shp06 = fcd06.Shape
doc.recompute()
return fcd06
filter_basehole = doc.addObject("Part::Feature", 'filter_basehole')
filter_basehole.Shape = shp_filter_basehole
filter_mov = doc.addObject("Part::MultiFuse", 'filtermov')
filter_mov.Shapes = [filter_basehole,railnuth, railnuth0, railnuth1]
# chamfer of the union between the base and the rails
doc.recompute()
doc.recompute()
filter_mov_cmf = fcfun.filletchamfer (fco = filter_mov,
e_len = RAIL_WS,
name = 'filtermovchmf',
fillet = 0, #chamfer
radius = 2.,
axis = 'x',
zpos_chk = 1,
zpos = FILT_BASE_H )
shp_face_railhole = fcfun.shp_face_rail(rail_w = RAIL_W,
rail_ws = RAIL_WS,
rail_h = RAIL_H,
rail_h_plus = 2.,
offs_w = TOL/2.,
offs_h = TOL/2.,
axis_l = 'z',