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trackball with variable size (f.e. billard ball) #83

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trackball with variable size (f.e. billard ball) #83

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98 changes: 97 additions & 1 deletion src/dactyl_manuform.py
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Original file line number Diff line number Diff line change
Expand Up @@ -308,7 +308,7 @@ def trackball_socket(segments=100, side="right"):

sensor = None

else:
elif ball_diameter == 34.0:
tb_file = path.join(parts_path, r"trackball_socket_body_34mm")
tbcut_file = path.join(parts_path, r"trackball_socket_cutter_34mm")
sens_file = path.join(parts_path, r"trackball_sensor_mount")
Expand All @@ -319,9 +319,105 @@ def trackball_socket(segments=100, side="right"):
cutter = import_file(tbcut_file)
cutter = union([cutter, import_file(senscut_file)])

else:
shape, cutter, sensor = trackball_socket_gen(ball_diameter, trackball_modular_ring_height, ball_gap, ball_wall_thickness )

# return shape, cutter
return shape, cutter, sensor

def trackball_socket_gen(balldiameter, ring_height, t_air, t_wall, bear_do=6, bear_di=3, bear_t=2.5, bolt_d=3.0, bolt_l=8, bolt_extern=False):
"""Generate a trackball sockets for all diameters."""
# ========== START internal functions ==========
def trans_bear(shp, rot_r=0, rot_depth=25):
shp = translate(shp, (-r_ball-bear_do/2,0,0))
shp = rotate(shp, (90, -rot_depth, rot_r))
return shp

def gen_fastening(r=10, t=5, alpha=30, beta=40):
shp = union([cylinder(r, t), # start with circle
rotate(translate( box(3*r,2*r,t),(1.5*r,0,0) ),(0,0,alpha)) ,
rotate(translate( box(3*r,2*r,t),(1.5*r,0,0) ),(0,0,-beta)) ])
return shp

def gen_sensor(w=22, l=32, t=10, cut=4.7, screw_dia=2, cutout=True):
shp = union([translate(cylinder(w/2, t), (0,+(l-w)/2,0)), # start with circle left
box(w,l-w,t), # center box
translate(cylinder(w/2, t), (0,-(l-w)/2,0))]) # end with circle right
if cutout:
screw_diff = 26.8 # why not 25.4
screw_exentric = -1.05 # move both screws in Y direction
offset_screw_1 = -(screw_diff)/2 - screw_exentric
offset_screw_2 = +(screw_diff)/2 + screw_exentric
offset_sens = 0.0
t_cut = 1.01 * t
shp = difference(shp, [ translate(union([cylinder(cut/2, t_cut), translate(box(cut,cut,t_cut),(0,-cut/2,0))]), (0,offset_sens,0)), # rounded box
translate(cylinder(screw_dia/2, t_cut), (0, offset_screw_1, 0) ), # screw 1
translate(cylinder(screw_dia/2, t_cut), (0, offset_screw_2, 0) ) ]) # screw 2
return shp
# ========== END internal functions ==========

# setup inner variables
r_ball = balldiameter / 2.0
r_iner = r_ball + t_air
r_outer = r_ball + t_air + t_wall
t_bear_air = t_air/2
height = ring_height + r_outer

show_ext_obj = False # Ball and bearing, only for development

# start with outer wall and top cylinder
shape = union([sphere(r_outer), translate(cylinder(r_outer, ring_height), (0,0,(ring_height)/2))])

for i in range(3):
bolt_orientation = 1
rot = -30 + 120 * i
# start with outer object
outer_t = bear_do/2 + t_wall

outer = union([gen_fastening(outer_t, bolt_l + 2*t_wall ),
translate( box(3*outer_t,2*outer_t,outer_t),(3*outer_t/2,0,0) ) ])
shape = union([shape, trans_bear(outer, rot_r=rot)])

shape = difference(shape,[trans_bear(gen_fastening(bear_do/2 + t_bear_air , bear_t + 2 * t_bear_air ), rot_r=rot) , # opening for bearing
trans_bear(cylinder(bolt_d/2, bolt_l), rot_r=rot) ]) # bolt

if bolt_extern:
bolt_insert = trans_bear(translate(cylinder(bolt_d/2, r_ball),(0,0, bolt_orientation*r_ball/2)), rot_r=rot)
bolt_inspect = trans_bear(translate(cylinder(.75, r_ball),(0,0,-bolt_orientation*r_ball/2)), rot_r=rot)
shape = difference(shape, [bolt_insert,bolt_inspect ])
else:
bolt_insert = trans_bear(gen_fastening( bolt_d / 2.1 , bolt_l*1.1, alpha=25, beta=-25), rot_r=rot)
shape = difference(shape, [bolt_insert])

# remove inner parts
shape = difference(shape, [sphere(r_iner),
translate(cylinder(1.1*r_outer,height), (0,0,height/2 + ring_height ) ), # above cylinder
translate(cylinder(r_iner,r_outer) , (0,0,r_outer/2 ) )]) # inner Cylinder

if show_ext_obj:
all_sh = [shape, sphere(r_ball)]
for i in range(3):
rot = -60 + 120 * i
all_sh.append(trans_bear(difference(cylinder(bear_do/2, bear_t),[cylinder(bolt_d/2, bolt_l)]), rot_r=rot) )
shape = union(all_sh)

sensor = difference(translate(gen_sensor(t=r_iner, cutout=True), (0,0, -r_iner/2)) , [sphere(r_iner)])

# start with cutout
cutout = union([translate(gen_sensor(t=r_outer, cutout=False), (0,0, -r_outer)),
translate(cylinder(r_iner, height-r_iner), (0,0,(height-r_iner)/2)),
sphere(r_iner)])
cutout_inlets=[cutout]
for i in range(3):
bolt_orientation = 1
rot = -30 + 120 * i
# rot = 0
cutout_inlets.append(trans_bear(gen_fastening(bear_do/2 + t_bear_air , bear_t + t_bear_air ), rot_r=rot))
cutout = union(cutout_inlets)

return shape, cutout, sensor


def trackball_ball(segments=100, side="right"):
shape = sphere(ball_diameter / 2)
return shape
Expand Down