def vert_bitbeam_holes(pos, length):
# holes are just 3.175 for now, but might need to be wider
cnc.comment("drilling holes")
for i in range(length):
hole_pos = (pos[0] + beam_width / 2,
pos[1] + beam_width / 2 + i * beam_width)
cnc.drill(hole_pos, material_height)
def vert_bitbeam(pos, length):
opp_corner = (pos[0] + beam_width, pos[1] + beam_width * length)
cnc.comment("milling down to bitbeam height/width")
cnc.fillrectangle(
pos,
opp_corner,
material_height - beam_width,
offset="outside")
# holes are just 3.175 for now, but might need to be wider
cnc.comment("drilling holes")
for i in range(length):
hole_pos = (pos[0] + beam_width / 2,
pos[1] + beam_width / 2 + i * beam_width)
cnc.drill(hole_pos, material_height)
cnc.comment("milling outside profile")
cnc.rectangle(
pos,
opp_corner,
material_height,
start_depth=material_height - beam_width,
offset="outside")
if '-t1' in sys.argv:
vert_bitbeam((5, 5), 5)
### 2nd (optional) pass/file - cut out guide for 3rd pass
if '-2' in sys.argv:
# guide / registration holes along bottom and side to line up guide
# drill into spoilboard, line up with 3.175 endmills or M3 bolts
cnc.drill((5, 5), depth=material_height + 3.000)
cnc.drill((80, 5), depth=material_height + 3.000)
# 'dogbone' slots to hold beams tightly in place for step 3
for pos, slot_length in beam_positions:
cnc.comment("Milling dogbone slot at (%.02f, %.02f)" % pos)
opp_corner = (pos[0] + beam_width, pos[1] + beam_width * length)
cnc.dogbone_rect(pos,
opp_corner,
material_height,
sides=('top', 'bottom'))
if '-t2' in sys.argv:
length = 5
pos = (5, 5)
cnc.comment("Milling dogbone slot at (%.02f, %.02f)" % pos)
opp_corner = (pos[0] + beam_width, pos[1] + beam_width * length)
cnc.dogbone_rect(pos,
opp_corner,
material_height,
sides=('top', 'bottom'))
# I think my "runout" was actually due to not bolting the rotary tool
# in hard enough...
runout = 0.0 # mm
cnc.tool_width = 3.175 + runout
cnc.step_over = cnc.tool_width / 2
cnc.step_down = cnc.tool_width / 2
# make tabs fairly chunky
cnc.tab_width = 5.000
cnc.tab_height = cnc.tool_width
material_height = 10.000 # mm
recess_depth = material_height - 7.5
cnc.comment("milling bottom block")
cnc.rectangle((5,5), (30, 15), depth=material_height, offset="outside", tab=True)
cnc.comment("milling central recess")
cnc.fillrectangle((10, 30), (25, 95), depth=recess_depth, offset="inside")
cnc.comment("milling central slot")
cnc.rectangle((14.75, 35), (20.25, 90), start_depth=recess_depth, depth=material_height, offset="inside")
cnc.comment("front slope")
# mill slightly outside the edges, so that we don't get rounded corners
cnc.fillrectangle((2.5, 105), (32.5, 110), depth=2.5, offset="inside")
cnc.fillrectangle((2.5, 110), (32.5, 115), depth=5.0, offset="inside")
cnc.fillrectangle((2.5, 115), (32.5, 120), depth=7.5, offset="inside")
cnc.comment("cut out around hold down")
