def _make_pcb(what):
"""build the actual passthrough PCB"""
# this copies some logic in the eachpoint() function so that we can use each() which is safer
base_plane = self.plane
base = base_plane.location
if isinstance(what, (cq.Vector, cq.Shape)):
loc = base.inverse * cq.Location(base_plane, what.Center())
elif isinstance(what, cq.Sketch):
loc = base.inverse * cq.Location(base_plane, what._faces.Center())
else:
loc = what
pcb = CQ().workplane(offset=-wall_depth - board_inner_depth)
pcb = pcb.rect(board_width,
pcbt).extrude(until=board_inner_depth + wall_depth +
board_outer_depth)
pcb = pcb.edges("|Y").fillet(pcb_corner)
# put in screws with holes
hardware = cadquery.Assembly()
pcb = pcb.faces(">Y").workplane(**u.cobb).rarray(
board_width - 2 * block_width / 2, board_inner_depth +
board_outer_depth + wall_depth - 2 * pt_pcb_mount_hole_offset[0],
2, 2).clearanceHole(pcb_scr,
fit="Close",
counterSunk=False,
baseAssembly=hardware)
if hw_asy is not None:
hw_asy.add(hardware, loc=base * loc)
# put in pin0 holes
pcb = pcb.faces(">Y").workplane(**u.copo,
origin=(0, 0,
0)).pushPoints(p0pts).circle(
pin0_holed /
2).cutThruAll()
return pcb.findSolid().moved(base * loc)
def mkbase(
aso: cadquery.Assembly,
thickness: float,
cshift,
extents,
hps,
screw: SocketHeadCapScrew,
pedistal_height: float,
zbase: float,
subs_boost: float,
):
"""the thermal base"""
plate_name = "thermal_plate"
vac_name = "vacuum_chuck"
color = cadquery.Color("GOLD")
fillet_outer = 2
fillet_inner = 10
chamfer = 1
corner_screw_depth = 4.5
pedistal_xy = (161, 152)
pedistal_fillet = 10
dowelpts = [(-73, -66), (73, 66)]
dowel_nominal_d = 3 # marked on drawing for pressfit with ⌀3K7
# vac chuck clamp screws
vacscrew_length = 20
vacscrew = CounterSunkScrew(size="M6-1",
fastener_type="iso14581",
length=vacscrew_length,
simple=no_threads) # SHK-M6-20-V2-A4
vacclamppts = [(-73, -54.75), (-73, 54.75), (73, -54.75), (73, 54.75)]
# slot plate clamp screws
spscrew_length = 8
spscrew = CounterSunkScrew(size="M3-0.5",
fastener_type="iso14581",
length=spscrew_length,
simple=no_threads) # SHK-M3-8-V2-A4
# setscrew clamping stuff
setscrew_len = 30
screw_well_depth = 3
setscrew_recess = pedistal_height + screw_well_depth
setscrew = SetScrew(size="M6-1",
fastener_type="iso4026",
length=setscrew_len,
simple=no_threads) # SSU-M6-30-A2
setscrewpts = [(-73, -43.5), (73, 43.5)]
# waterblock nuts and holes
wb_w = 177.8
wb_mount_offset_from_edge = 7.25
wb_mount_offset = wb_w / 2 - wb_mount_offset_from_edge
waterblock_mount_nut = HexNutWithFlange(
size="M6-1", fastener_type="din1665",
simple=no_threads) # HFFN-M6-A2
wb_mount_points = [
(120, wb_mount_offset),
(120, -wb_mount_offset),
(-129, wb_mount_offset),
(-129, -wb_mount_offset),
]
# make the base chunk
wp = CQ().workplane(**u.copo, offset=zbase).sketch()
wp = wp.push([cshift]).rect(extents[0], extents[1], mode="a")
wp = wp.finalize().extrude(thickness)
wp: cadquery.Workplane # shouldn't have to do this (needed for type hints)
# cut for waterblock mnt ears
ear_square = 2 * wb_mount_offset
wp = wp.faces("<X").workplane(**u.cobb).rect(
xLen=extents[1] - 2 * ear_square, yLen=thickness,
centered=True).cutBlind(-(extents[0] - wall_outer[0]) / 2)
wp = wp.faces(">X").workplane(**u.cobb).rect(
xLen=extents[1] - 2 * ear_square, yLen=thickness,
centered=True).cutBlind(-(extents[0] - wall_outer[0]) / 2)
wp = wp.edges("|Z exc (<<X or >>X)").fillet(fillet_inner)
wp = wp.edges("|Z and (<<X or >>X)").fillet(fillet_outer)
# pedistal
wp = wp.faces(">Z").workplane(**u.copo, origin=(
0, 0, 0)).sketch().rect(
*pedistal_xy).reset().vertices().fillet(pedistal_fillet)
wp = wp.finalize().extrude(pedistal_height)
hardware = cq.Assembly(None) # a place to keep the harware
# corner screws
wp = wp.faces("<Z").workplane(**u.copo,
offset=-corner_screw_depth).pushPoints(
hps).clearanceHole(
fastener=screw,
fit="Close",
baseAssembly=hardware)
wp = wp.faces("<Z[-2]").wires().toPending().extrude(
corner_screw_depth,
combine="cut") # make sure the recessed screw is not buried
# dowel holes
wp = wp.faces(">Z").workplane(**u.copo).pushPoints(dowelpts).hole(
dowel_nominal_d + dowel3_delta_press, depth=pedistal_height)
# waterblock mounting
wp = wp.faces(">Z[-2]").workplane(
**u.copo).pushPoints(wb_mount_points).clearanceHole(
fastener=waterblock_mount_nut,
counterSunk=False,
fit="Loose",
baseAssembly=hardware)
# vac chuck stuff
# split
wp = wp.faces(">Z[-2]").workplane(**u.copo).split(
keepTop=True, keepBottom=True).clean()
btm_piece = wp.solids("<Z").first().edges("not %CIRCLE").chamfer(
chamfer)
top_piece = wp.solids(">Z").first().edges("not %CIRCLE").chamfer(
chamfer)
# hole array
n_array_x = 4
n_array_y = 5
x_spacing = 35
y_spacing = 29
x_start = (n_array_x - 1) / 2
y_start = (n_array_y - 1) / 2
n_sub_array_x = 8
n_sub_array_y = 2
x_spacing_sub = 3
y_spacing_sub = 10
x_start_sub = (n_sub_array_x - 1) / 2
y_start_sub = (n_sub_array_y - 1) / 2
hole_d = 1
hole_cskd = 1.1
csk_ang = 45
# compute all the vac chuck vent hole points
vac_hole_pts = [] # where the vac holes are drilled
street_centers = [] # the distribution street y values
for i in range(n_array_x):
for j in range(n_array_y):
for k in range(n_sub_array_x):
for l in range(n_sub_array_y):
ctrx = (i - x_start) * x_spacing
ctry = (j - y_start) * y_spacing
offx = (k - x_start_sub) * x_spacing_sub
offy = (l - y_start_sub) * y_spacing_sub
vac_hole_pts.append((ctrx + offx, ctry + offy))
street_centers.append((0, ctry + offy))
street_centers = list(set(street_centers)) # prune duplicates
# boost substrates up so they can't slip under
raise_square = (25, 25)
raise_fillet = 1
top_piece = CQ(top_piece.findSolid()).faces(">Z").workplane(
**u.copo).sketch().rarray(
x_spacing, y_spacing, n_array_x,
n_array_y).rect(*raise_square).reset().vertices().fillet(
raise_fillet).finalize().extrude(subs_boost)
# drill all the vac holes
top_piece = top_piece.faces(">Z").workplane(
**u.copo).pushPoints(vac_hole_pts).cskHole(diameter=hole_d,
cskDiameter=hole_cskd,
cskAngle=csk_ang)
# clamping setscrew threaded holes
top_piece = top_piece.faces(">Z").workplane().pushPoints(
setscrewpts).tapHole(
setscrew, depth=setscrew_recess, baseAssembly=hardware
) # bug prevents this from working correctly, workaround below
# clamping setscrew downbumps in the thermal plate
btm_piece = CQ(btm_piece.findSolid()).faces(">Z").workplane(
**u.copo).pushPoints(setscrewpts).circle(
vacscrew.clearance_hole_diameters["Close"] /
2).cutBlind(-screw_well_depth)
# vac chuck clamping screws
top_piece = top_piece.faces(">Z[-2]").workplane(
**u.copo, origin=(0, 0, 0)).pushPoints(vacclamppts).clearanceHole(
vacscrew, fit="Close", baseAssembly=hardware)
# next line is a hack to make absolutely sure the screws are recessed
top_piece = top_piece.faces(">Z[-2]").workplane(
**u.copo, origin=(0, 0, 0)).pushPoints(vacclamppts).cskHole(
vacscrew.clearance_hole_diameters["Close"],
cskDiameter=vacscrew.head_diameter + 1,
cskAngle=vacscrew.screw_data["a"])
btm_piece = btm_piece.faces(">Z").workplane(**u.copo, origin=(
0, 0, 0)).pushPoints(vacclamppts).tapHole(
setscrew, depth=vacscrew_length - pedistal_height +
1) # threaded holes to attach to
# mod the slot plate to include csk screws for clamping
for name, part in asys["squirrel"].traverse():
if name == "slot_plate":
sp_clamp_pts = [(p[0], p[1] + 5) for p in vacclamppts]
sp = part.obj
vch_shift_y = -37
vch_shift_x = 3
sp = sp.faces(">Z").workplane(**u.copo, origin=(
0, 0, 0)).rarray(vacclamppts[3][0] * 2 + vch_shift_x,
vacclamppts[3][1] * 2 + vch_shift_y, 2,
2).clearanceHole(spscrew,
fit="Close",
baseAssembly=hardware)
# next line is a hack to make absolutely sure the screws are recessed
sp = sp.faces(">Z").workplane(**u.copo, origin=(
0, 0, 0)).rarray(
vacclamppts[3][0] * 2 + vch_shift_x,
vacclamppts[3][1] * 2 + vch_shift_y, 2,
2).cskHole(spscrew.clearance_hole_diameters["Close"],
cskDiameter=spscrew.head_diameter + 1,
cskAngle=spscrew.screw_data["a"])
part.obj = sp
# make threaded holes to attach to, TODO: mark these as M3x0.5 threaded holes in engineering drawing
top_piece = top_piece.faces(">Z[-2]").workplane(
**u.copo,
origin=(0, 0,
0)).rarray(vacclamppts[3][0] * 2 + vch_shift_x,
vacclamppts[3][1] * 2 + vch_shift_y, 2,
2).tapHole(spscrew,
depth=spscrew_length - 1,
counterSunk=False)
# compute the hole array extents for o-ring path finding
sub_x_length = (n_sub_array_x - 1) * x_spacing_sub + hole_d
array_x_length = (n_array_x - 1) * x_spacing + sub_x_length
sub_y_length = (n_sub_array_y - 1) * y_spacing_sub + hole_d
array_y_length = (n_array_y - 1) * y_spacing + sub_y_length
# for the vac chuck fitting
vac_fitting_chuck_offset = -0.5 * y_spacing
fitting_tap_depth = 20
top_piece = top_piece.faces(">X").workplane(**u.cobb).center(
vac_fitting_chuck_offset, 0).tapHole(vac_fitting_screw,
depth=fitting_tap_depth)
vac_chuck_fitting = cadquery.Assembly(a_vac_fitting.rotate(
axisStartPoint=(0, 0, 0), axisEndPoint=(0, 0, 1), angleDegrees=-5),
name="chuck_vac_fitting")
hardware.add(vac_chuck_fitting,
loc=top_piece.plane.location,
name="vac chuck fitting")
# handle the valve, part number 435-8101
a_valve = u.import_step(
wrk_dir.joinpath("components", "VHK2-04F-04F.step"))
# a_valve = a_valve.rotate(axisStartPoint=(0, 0, 0), axisEndPoint=(0, 1, 0), angleDegrees=90).translate((0, 7.5, 9))
a_valve = a_valve.translate((0, 7.5, 9))
valve_mnt_spacing = 16.5
valve_mnt_screw_length = 30
valve_body_width = 18
valve_mnt_hole_depth = 15
valve_mnt_screw = PanHeadScrew(
size="M4-0.7",
fastener_type="iso14583",
length=valve_mnt_screw_length) # SHP-M4-30-V2-A4
btm_piece = btm_piece.faces(">X[-2]").workplane(**u.cobb).rarray(
valve_mnt_spacing, 1, 2,
1).tapHole(valve_mnt_screw,
depth=valve_mnt_hole_depth,
counterSunk=False) # cut threaded holes
btm_piece = btm_piece.faces(">X[-2]").workplane(**u.cobb).rarray(
valve_mnt_spacing, 1, 2,
1).tapHole(valve_mnt_screw,
depth=valve_mnt_screw_length - valve_body_width,
counterSunk=False,
baseAssembly=aso) # add screws
aso.add(a_valve, loc=btm_piece.plane.location, name="valve")
# handle the elbow, part number 306-5993
an_elbow = u.import_step(
wrk_dir.joinpath("components", "3182_04_00.step"))
an_elbow = an_elbow.rotate(axisStartPoint=(0, 0, 0),
axisEndPoint=(0, 1, 0),
angleDegrees=-90).rotate(
axisStartPoint=(0, 0, 0),
axisEndPoint=(0, 0, 1),
angleDegrees=90) # rotate the elbow
btm_pln = btm_piece.faces(">X[-2]").workplane(
**u.cobb,
offset=valve_body_width / 2).center(-26.65,
7.5) # position the elbow
aso.add(an_elbow, loc=btm_pln.plane.location, name="elbow")
# vac distribution network
zdrill_loc = (pedistal_xy[0] / 2 - fitting_tap_depth, 0.5 * y_spacing)
zdrill_r = 3
zdrill_depth = -pedistal_height / 2 - 2.5
top_piece = top_piece.faces("<Z").workplane(**u.cobb).pushPoints(
[zdrill_loc]).circle(zdrill_r).cutBlind(zdrill_depth)
highway_depth = 3
highway_width = 6
street_depth = 2
street_width = 1
top_piece = top_piece.faces("<Z").workplane(**u.cobb).sketch().push([
(zdrill_loc[0] / 2, zdrill_loc[1])
]).slot(w=zdrill_loc[0],
h=highway_width).finalize().cutBlind(-highway_depth)
top_piece = top_piece.faces("<Z").workplane(**u.cobb).sketch().slot(
w=pedistal_xy[0] - 2 * fitting_tap_depth,
h=highway_width,
angle=90).finalize().cutBlind(-highway_depth) # cut center highway
top_piece = top_piece.faces("<Z").workplane(
**u.cobb).sketch().push(street_centers).slot(
w=array_x_length - hole_d, h=street_width).finalize().cutBlind(
-street_depth) # cut streets
# padding to keep the oring groove from bothering the vac holes
groove_x_pad = 8
groove_y_pad = 16
# that's part number 196-4941
o_ring_thickness = 2
o_ring_inner_diameter = 170
# cut the o-ring groove
top_piece = top_piece.faces("<Z").workplane(**u.cobb).mk_groove(
ring_cs=o_ring_thickness,
follow_pending_wires=False,
ring_id=o_ring_inner_diameter,
gland_x=array_x_length + groove_x_pad,
gland_y=array_y_length + groove_y_pad,
hardware=hardware)
# cut the electrical contact screw mount holes
vc_e_screw_spacing = 15
vc_e_screw_center_offset = 10
vc_e_screw_hole_depth = 12
vc_e_screw_screw_length = 8
vc_e_srew_type = "M3-0.5"
e_dummy = SetScrew(vc_e_srew_type,
fastener_type="iso4026",
length=vc_e_screw_screw_length,
simple=no_threads)
# mark these chuck electrical connection screw holes in engineering drawing as M3x0.5
top_piece = top_piece.faces("<X").workplane(**u.cobb).center(
vc_e_screw_center_offset,
0).rarray(vc_e_screw_spacing, 1, 2,
1).tapHole(e_dummy, depth=vc_e_screw_hole_depth)
aso.add(btm_piece, name=plate_name, color=color)
aso.add(top_piece, name=vac_name, color=color)
aso.add(hardware.toCompound(),
name="hardware",
color=cadquery.Color(hardware_color))
def _make_pt(what):
"""build a passthrough component"""
# this copies some logic in the eachpoint() function so that we can use each() which is safer
base_plane = self.plane
base = base_plane.location
if isinstance(what, (cq.Vector, cq.Shape)):
loc = base.inverse * cq.Location(base_plane, what.Center())
elif isinstance(what, cq.Sketch):
loc = base.inverse * cq.Location(base_plane, what._faces.Center())
else:
loc = what
hardware = cadquery.Assembly()
passthrough = CQ().add(passthrough_face)
passthrough = passthrough.wires().toPending().extrude(
-part_thickness) # extrude the bulk
slotd = pcbt + 2 * min_gap
passthrough = passthrough.workplane(
centerOption="ProjectedOrigin").slot2D(
length=board_width + slotd / 2, diameter=slotd,
angle=0).cutThruAll() # cut the pcb slot
# TODO: retool some geometry because this cutout could possibly interfere with the oring gland for thick PCBs
# cut the oring groove
cq.Workplane.mk_groove = groovy.mk_groove
oring_path = o_face.outerWire().translate((0, 0, -part_thickness))
passthrough = passthrough.faces("<<Z").workplane(
**u.copo).add(oring_path).toPending().mk_groove(ring_cs=oring_cs,
hardware=hardware)
# cut the fastening screw holes
passthrough = passthrough.faces(">Z").workplane(
**u.copo,
origin=(0, 0,
0)).pushPoints(fhps).clearanceHole(fix_scr,
fit="Close",
baseAssembly=hardware)
# add the support towers
in_post_length = wall_depth + board_inner_depth
passthrough = passthrough.faces(">Z").workplane(
**u.copo, origin=(0, 0, 0)).sketch().push(sbpts).rect(
*support_block).finalize().extrude(-in_post_length)
passthrough = passthrough.faces(">Z").workplane(
**u.copo, origin=(0, 0, 0)).sketch().push(sbpts).rect(
*support_block).finalize().extrude(board_outer_depth)
# mount holes
pcb_center_z = ((board_outer_depth) -
(wall_depth + board_inner_depth)) / 2
passthrough = passthrough.faces("+Y").faces(">>Z").workplane(
**u.copo, origin=(0, 0, pcb_center_z)).rarray(
board_width - 2 * pt_pcb_mount_hole_offset[1],
board_inner_depth + board_outer_depth + wall_depth -
2 * pt_pcb_mount_hole_offset[0], 2,
2).clearanceHole(pcb_scr, fit="Close", counterSunk=False)
passthrough = passthrough.edges("<<Z or >>Z").edges("|Y").fillet(
pcb_corner)
passthrough = passthrough.edges(
"<<Z[-1] or <<Z[-2] or <<Z[-3] or >>Z[-1] or >>Z[-2] or >>Z[-3]"
).chamfer(0.5)
if hw_asy is not None:
hw_asy.add(hardware, loc=base * loc)
return passthrough.findSolid().moved(base * loc)