def bore_circle_ID(Z_safe, stock_thickness, cut_per_pass, target_depth,
cutter_diameter, circle_diameter):
"""use G2; from specified diameter and thickness;
cutter compensation in function.
Note that this method mixes ABSOLUTE with INCREMENTAL modes:
all moves in XY are in INCR and all moves in Z are ABS."""
assert cutter_diameter <= circle_diameter, "bit is too large for desired hole"
assert Z_safe > stock_thickness, "Z_safe is too short for stock thickness"
# alternate path: do a straight drill
if cutter_diameter == circle_diameter:
file_text = G.set_ABS_mode()
file_text += G.G0_Z(stock_thickness)
file_text += G.G1_Z(target_depth)
file_text += G.set_dwell(0.5)
file_text += G.G0_Z(Z_safe)
return file_text
off_set = (circle_diameter - cutter_diameter) / 2.0
file_text = G.set_ABS_mode()
file_text += G.G0_Z(Z_safe)
# XY-plane move to starting point
file_text += G.set_INCR_mode()
file_text += G.G0_XY((-off_set, 0))
# Z-axis move to starting point
file_text += G.set_ABS_mode()
file_text += G.G0_Z(stock_thickness)
while stock_thickness > target_depth:
stock_thickness -= cut_per_pass
if stock_thickness < target_depth:
stock_thickness = target_depth
# Z-axis move
file_text += G.set_ABS_mode()
file_text += G.G1_Z(stock_thickness)
# XY-plane arc move
file_text += G.G2XY_to_INCR_FULL((0, 0), (off_set, 0))
# At end of cut, ensures that the program reaches the very bottom
file_text += G.set_dwell(0.5)
# Z-axis move
# TODO: move this to before the return to origin
file_text += G.set_ABS_mode()
file_text += G.G0_Z(Z_safe)
# Then put the bit back to (0,0)
file_text += G.set_INCR_mode()
file_text += G.G0_XY((off_set, 0))
return file_text
def bore_tabbed_ID(Z_safe, stock_thickness, cut_per_pass, tab_thickness,
cutter_diameter, circle_diameter, tab_width):
""" Cut three tabs."""
assert tab_thickness <= cut_per_pass, "script not set to handle cut_per_pass when it's less than tab thickness"
off_set = (circle_diameter - cutter_diameter) / 2.0
path_length = math.pi * off_set * 2
# NOTE: radius = off_set, path_length is circumference of the circle that the cutter will be tracing
assert path_length > 6.0 * (
tab_width +
cutter_diameter), "tabs and/or bit are too large for the circle to cut"
# gap_radians is the gap (in radians) between the start and stop of each pair of cuts
gap_radians = (cutter_diameter + tab_width) / off_set
# file_text = "% cutting bore_tabbed_ID \n"
file_text = G.set_ABS_mode()
file_text += G.G0_Z(Z_safe)
# XY-plane move to starting point, creating the first tab
# at approximately 180 degrees
file_text += G.set_INCR_mode()
x = -math.cos(gap_radians) * off_set
y = math.sin(gap_radians) * off_set
file_text += G.G0_XY((x, y))
file_text += G.set_ABS_mode()
# 1 G2 cut after the first tab
file_text += G.G1_Z(0)
x = (math.cos(gap_radians) + math.cos(math.pi / 3.0)) * off_set
y = (-math.sin(gap_radians) + math.sin((2 * math.pi) / 3.0)) * off_set
i = math.cos(gap_radians) * off_set
j = -math.sin(gap_radians) * off_set
file_text += G.G2XY_to_INCR_FULL((x, y), (i, j))
# 2 G2 create the second tab
# at approximately 60 degrees
file_text += G.G0_Z(tab_thickness)
x = (math.cos((math.pi / 3.0) - gap_radians) -
math.cos(math.pi / 3.0)) * off_set
y = (math.sin((math.pi / 3.0) - gap_radians) -
math.sin(math.pi / 3.0)) * off_set
i = -math.cos(math.pi / 3.0) * off_set
j = -math.sin(math.pi / 3.0) * off_set
file_text += G.G2XY_to_INCR_FULL((x, y), (i, j))
# 3 G2 cut after the second tab
file_text += G.set_ABS_mode()
file_text += G.G1_Z(0)
x = 0
y = -2 * math.sin((math.pi / 3.0) - gap_radians) * off_set
i = -math.cos((math.pi / 3.0) - gap_radians) * off_set
j = -math.sin((math.pi / 3.0) - gap_radians) * off_set
file_text += G.G2XY_to_INCR_FULL((x, y), (i, j))
# 4 G2 create the third tab
file_text += G.G0_Z(tab_thickness)
x = -(math.cos(
(math.pi / 3.0) - gap_radians) - math.cos(math.pi / 3.0)) * off_set
y = (math.sin((math.pi / 3.0) - gap_radians) -
math.sin(math.pi / 3.0)) * off_set
i = -math.cos((math.pi / 3.0) - gap_radians) * off_set
j = math.sin((math.pi / 3.0) - gap_radians) * off_set
file_text += G.G2XY_to_INCR_FULL((x, y), (i, j))
# 5 G2 cut after the third tab
file_text += G.set_ABS_mode()
file_text += G.G1_Z(0)
x = -(1 + math.cos(math.pi / 3.0)) * off_set
y = math.sin(math.pi / 3.0) * off_set
i = -math.cos(math.pi / 3.0) * off_set
j = math.sin(math.pi / 3.0) * off_set
file_text += G.G2XY_to_INCR_FULL((x, y), (i, j))
# return to Z_safe and origin
file_text += G.set_ABS_mode()
file_text += G.G0_Z(Z_safe)
file_text += G.set_INCR_mode()
file_text += G.G0_XY((off_set, 0))
return file_text