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#! /usr/bin/python
# Copyright 2008 by Bdale Garbee <bdale@gag.com>. GPLv2
# Copyright 2011 by Anthony Towns <aj@erisian.com.au>. GPLv2
# This is a Python library to emit g-code to cut motor mount centering
# rings or bulkheads for a model rocket.
#
# Z reference plane is top surface of stock, X/Y origin is center of ring
import math
import sys
def mm2inch(mm):
return mm/25.4
def polar2xy(radius, degrees = None, radians = None):
if degrees is not None:
radians = degrees / 180.0 * math.pi
x = radius * math.cos(radians)
y = radius * math.sin(radians)
return x,y
class Gcode(object):
def __init__(self,
free, cutter, speed = 8,
output = sys.stdout):
self.Zfree = free
self.Zdepth = 0.0
self.Speed = speed
self.CutterOD = cutter
self.output = output
self.write("%")
self.write("G17 G20 G90")
self.write("M3 S5000")
self.origin()
def comment(self, comment):
self.output.write("\n(%s)\n" % (comment))
def close(self):
self.write("M5 M2")
self.write("%")
self.output.close()
def write(self, gcode):
self.output.write(gcode + "\n")
def plunge(self):
self.write("(plunge)")
self.write("G01 Z %.4f F%d" % (-self.Zdepth, int(self.Speed/2)))
def retract(self):
self.write("(retract)")
self.write("G00 Z %.4f" % (self.Zfree))
def origin(self):
self.retract()
self.write("(origin)")
self.write("G00 X0 Y0")
def hole(self, x, y, depth, increment, speed):
self.write("G00 X %6.4f Y %6.4f" % (x, y))
self.write("G83 Z %6.4f R %.4f Q %6.4f F %d" % (-depth, self.Zfree, increment, speed))
def circle(self, diameter, x=0, y=0):
radius = diameter/2.0
self.write("G00 X %6.4f Y %6.4f" % (x, y + radius))
self.plunge()
self.write("G02 X %6.4f Y %6.4f I %6.4f J %6.4f F%d" % (
x, y - radius, 0, -radius, self.Speed))
self.write("G02 X %6.4f Y %6.4f I %6.4f J %6.4f F%d" % (
x, y + radius, 0, +radius, self.Speed))
self.retract()
def slot(self, startX, startY, stopX, stopY, width, depth, increment):
deltaX = stopX - startX
deltaY = stopY - startY
length = (deltaX**2 + deltaY**2)**0.5
offX = -deltaY / length # unit vector, 90 degrees to slot
offY = deltaX / length
width += 0.0
if increment > depth:
self.Zdepth = depth
else:
self.Zdepth = increment
while self.Zdepth <= depth:
if width < self.CutterOD:
self.comment("***desired slot width smaller than cutter***")
runs = 1
step = 0
elif width == self.CutterOD:
runs = 1
step = 0
else:
runs = int(math.ceil((width)/self.CutterOD))
beginX = startX + offX * (width-self.CutterOD)/2
beginY = startY + offY * (width-self.CutterOD)/2
endX = stopX + offX * (width-self.CutterOD)/2
endY = stopY + offY * (width-self.CutterOD)/2
step = (width-self.CutterOD)/(runs-1)
self.write("G00 X%6.4f Y%6.4f" % (beginX, beginY))
self.plunge()
for n in range(runs-1):
self.write("G01 X%6.4f Y%6.4f F%d" % (endX, endY, self.Speed))
beginX, endX = endX - offX * step, beginX - offX * step
beginY, endY = endY - offY * step, beginY - offY * step
self.write("G01 X%6.4f Y%6.4f F%d" % (beginX, beginY, self.Speed))
self.write("G01 X%6.4f Y%6.4f F%d" % (endX, endY, self.Speed))
self.retract()
if self.Zdepth == depth:
break
self.Zdepth += increment
if self.Zdepth > depth:
self.Zdepth = depth
def fin_slots(self, FinCount, innerD, outerD, width, depth, increment = 0.1, rotate = 0):
for fin in range(FinCount):
self.comment("fin slot %d" % (fin))
FinDegrees = 90 + rotate + 360.0 / FinCount * fin
while FinDegrees > 360: FinDegrees -= 360
# angle from origin (on y-axis)
FinSlotInX, FinSlotInY = polar2xy((innerD/2.0)-self.CutterOD,
degrees=FinDegrees)
FinSlotOutX, FinSlotOutY = polar2xy((outerD/2.0)+self.CutterOD,
degrees=FinDegrees)
self.slot(FinSlotInX, FinSlotInY, FinSlotOutX, FinSlotOutY, width, depth, increment)
def ring_cluster(self, count, diam, sep = 1.0, rotation = 0, dist = None):
base_dist = diam/2.0 / math.sin(math.pi/count)
if (dist is not None):
sep = dist / base_dist
for cluster in range(count):
self.comment("cluster MMT hole %d" % (cluster))
degrees = rotation + cluster*360.0/count
while degrees > 360: degrees -= 360
ClusX, ClusY = polar2xy(base_dist * sep, degrees=degrees)
self.circle(diam - self.CutterOD, x=ClusX, y=ClusY)
def aeropack(self, count, hole_radius, rotation, depth, increment, speed):
for h in range(count):
self.comment("Aeropack screw hole %d" % (h))
degrees = rotation + h*360.0/count
while degrees > 360: degrees -= 360
HoleX, HoleY = polar2xy(hole_radius, degrees=degrees)
self.hole(x=HoleX, y=HoleY, depth=depth, increment=increment, speed=speed)
def aeropack_54mm(self, rotation = 15, depth = 0.125, increment = 0.125, speed = 25):
self.aeropack(12, mm2inch(46), rotation, depth, increment, speed)
def aeropack_75mm(self, rotation = 15, depth = 0.125, increment = 0.125, speed = 25):
self.aeropack(12, mm2inch(46), rotation, depth, increment, speed)
def aeropack_98mm(self, rotation = 15, depth = 0.125, increment = 0.125, speed = 25):
self.aeropack(12, mm2inch(46), rotation, depth, increment, speed)
def dsub(self, x, y, rotation = 0):
# 9pin dsub female
# 1mm deep frame, 30mm long by 12mm wide
old_depth = self.Zdepth
self.Zdepth = mm2inch(1)
dX, dY = polar2xy(mm2inch(15), degrees = rotation)
self.slot(x-dX, y-dY, x+dX, y+dY, mm2inch(12))
# need approx 1cm of depth for connector + room for wires
# so that's basically all the way through...
# connector is barely 1mm (maybe 0.5mm?) on sides
# connector is 6mm from either edge on longer side
# connector is 8mm from either edge on shorter side
self.Zdepth = old_depth
dX, dY = polar2xy(mm2inch(9), degrees = rotation)
self.slot(x-dX, y-dY, x+dX, y+dY, mm2inch(10))
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