def mk_vgroove(cutter_path, entry_point, depth):
""" for cutting grooves with a 90 degree countersink cutter"""
half_profile = CQ('XZ').polyline([(0, 0), (depth, 0), (0, -depth)]).close()
cutter = half_profile.revolve()
cutter_split = cutter.split(keepTop=True)
cutter_crosssection = cutter_split.faces('+Y') #TODO do this more generally
cutter_crosssection_shift = cutter_crosssection.translate(entry_point)
to_sweep = cutter_crosssection_shift.wires().toPending()
sweep_result = to_sweep.sweep(cutter_path, combine=True, transition="round", sweepAlongWires=False, isFrenet=True)
return sweep_result
def _make_one_groove(wp, _wire, _vdepth, _ring_cs, _compression_ratio,
_gland_fill_ratio):
cp_tangent = _wire.tangentAt(0) # tangent to cutter_path
cp_start = _wire.startPoint()
build_plane = cq.Plane(origin=cp_start,
normal=cp_tangent,
xDir=wp.plane.zDir)
if _vdepth > 0: # we'll cut a vgroove this deep
half_profile = CQ(build_plane).polyline([(0, 0), (-_vdepth, 0),
(0, _vdepth)]).close()
elif ring_cs > 0: # we'll cut an o-ring groove, ring_cs is the diameter of the cross section of the o-ring
# according to https://web.archive.org/web/20220512010502/https://www.globaloring.com/o-ring-groove-design/
gland_height = get_gland_height(_ring_cs, _compression_ratio)
gland_width = get_gland_width(_ring_cs, _compression_ratio,
_gland_fill_ratio)
half_profile = CQ(build_plane).polyline([
(0, 0), (-gland_height, 0), (-gland_height, gland_width / 2),
(0, gland_width / 2)
]).close()
else:
raise ValueError("One of vdepth or ring_cs must be larger than 0")
cutter = half_profile.revolve(axisEnd=(1, 0, 0))
cutter_split = cutter.split(keepTop=True)
faces = cutter_split.faces().vals()
for face in faces: # find the right face to sweep with
facenorm = face.normalAt()
dotval = facenorm.dot(cp_tangent)
if abs(
(abs(dotval) - 1)
) <= 0.001: # allow for small errors in orientation calculation
cutter_crosssection = face
break
else:
raise ValueError("Unable to find a cutter cross-section")
# make the squished o-ring hardware
if (ring_cs > 0) and (hardware is not None):
ring_sweep_wire = CQ(build_plane).center(
-gland_height / 2,
0).ellipse(gland_height / 2, ring_cs / 2 *
(1 + _compression_ratio)).wires().toPending()
hardware.add(
ring_sweep_wire.sweep(_wire,
combine=True,
transition="round",
isFrenet=True).findSolid())
to_sweep = CQ(cutter_crosssection).wires().toPending()
return to_sweep.sweep(_wire).findSolid()
