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Added support for imperial threads to thread milling

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This commit is contained in:
Markus Lampert
2019-08-17 19:27:11 -07:00
parent 15141e33dc
commit c11aaafc54
8 changed files with 174 additions and 150 deletions
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23
src/Mod/Path/PathScripts/PathThreadMilling.py
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@@ -31,6 +31,7 @@ import PathScripts.PathGeom as PathGeom
import PathScripts.PathLog as PathLog
import PathScripts.PathOp as PathOp
import PathScripts.PathUtils as PathUtils
import math
from PySide import QtCore
@@ -47,14 +48,20 @@ def translate(context, text, disambig=None):
return QtCore.QCoreApplication.translate(context, text, disambig)
def radiiMetricInternal(majorDia, minorDia, toolDia, toolCrest = None):
def radiiInternal(majorDia, minorDia, toolDia, toolCrest = None):
'''internlThreadRadius(majorDia, minorDia, toolDia, toolCrest) ... returns the maximum radius for thread.'''
PathLog.track(majorDia, minorDia, toolDia, toolCrest)
if toolCrest is None:
toolCrest = 0.0
# see https://www.amesweb.info/Screws/Internal-Metric-Thread-Dimensions-Chart.aspx
# As it turns out metric and imperial standard threads follow the same rules.
# The determining factor is the height of the full 60 degree triangle H.
# - The minor diameter is 1/4 * H smaller than the pitch diameter.
# - The major diameter is 3/8 * H bigger than the pitch diameter
# Since we already have the outer diameter it's simpler to just add 1/8 * H
# to get the outer tip of the thread.
H = ((majorDia - minorDia) / 2.0 ) * 1.6 # (D - d)/2 = 5/8 * H
outerTip = majorDia / 2.0 + H / 8.0
# Compensate for the crest of the tool
toolTip = outerTip - toolCrest * 0.8660254037844386 # math.sqrt(3)/2 ... 60deg triangle height
return ((minorDia - toolDia) / 2, toolTip - toolDia / 2)
@@ -161,11 +168,12 @@ class ObjectThreadMilling(PathCircularHoleBase.ObjectOp):
RightHand = 'RightHand'
ThreadTypeCustom = 'Custom'
ThreadTypeMetricInternal = 'Metric - internal'
ThreadTypeImperialInternal = 'Imperial - internal'
DirectionClimb = 'Climb'
DirectionConventional = 'Conventional'
ThreadOrientations = [LeftHand, RightHand]
ThreadTypes = [ThreadTypeCustom, ThreadTypeMetricInternal]
ThreadTypes = [ThreadTypeCustom, ThreadTypeMetricInternal, ThreadTypeImperialInternal]
Directions = [DirectionClimb, DirectionConventional]
def circularHoleFeatures(self, obj):
@@ -179,7 +187,8 @@ class ObjectThreadMilling(PathCircularHoleBase.ObjectOp):
obj.addProperty("App::PropertyString", "ThreadName", "Thread", QtCore.QT_TRANSLATE_NOOP("App::Property", "Devfines which standard thread was chosen"))
obj.addProperty("App::PropertyLength", "MajorDiameter", "Thread", QtCore.QT_TRANSLATE_NOOP("App::Property", "Set thread's major diameter"))
obj.addProperty("App::PropertyLength", "MinorDiameter", "Thread", QtCore.QT_TRANSLATE_NOOP("App::Property", "Set thread's minor diameter"))
obj.addProperty("App::PropertyLength", "Pitch", "Thread", QtCore.QT_TRANSLATE_NOOP("App::Property", "Set thread's pitch"))
obj.addProperty("App::PropertyLength", "Pitch", "Thread", QtCore.QT_TRANSLATE_NOOP("App::Property", "Set thread's pitch - used for metric threads"))
obj.addProperty("App::PropertyInteger", "TPI", "Thread", QtCore.QT_TRANSLATE_NOOP("App::Property", "Set thread's tpi - used for imperial threads"))
obj.addProperty("App::PropertyInteger", "ThreadFit", "Thread", QtCore.QT_TRANSLATE_NOOP("App::Property", "Set how many passes are used to cut the thread"))
obj.addProperty("App::PropertyInteger", "Passes", "Operation", QtCore.QT_TRANSLATE_NOOP("App::Property", "Set how many passes are used to cut the thread"))
obj.addProperty("App::PropertyEnumeration", "Direction", "Operation", QtCore.QT_TRANSLATE_NOOP("App::Property", "Direction of thread cutting operation"))
@@ -254,7 +263,7 @@ class ObjectThreadMilling(PathCircularHoleBase.ObjectOp):
self.commandlist.append(Path.Command('G0', {'Z': obj.ClearanceHeight.Value, 'F': self.vertRapid}))
for radius in threadPasses(obj.Passes, radiiMetricInternal, obj.MajorDiameter.Value, obj.MinorDiameter.Value, self.tool.Diameter, 0):
for radius in threadPasses(obj.Passes, radiiInternal, obj.MajorDiameter.Value, obj.MinorDiameter.Value, self.tool.Diameter, 0):
commands = internalThreadCommands(loc, gcode, zStart, zFinal, pitch, radius, obj.LeadInOut)
for cmd in commands:
p = cmd.Parameters
@@ -274,6 +283,8 @@ class ObjectThreadMilling(PathCircularHoleBase.ObjectOp):
(cmd, zStart, zFinal) = self.threadSetup(obj)
pitch = obj.Pitch.Value
if obj.TPI > 0:
pitch = 25.4 / obj.TPI
if pitch <= 0:
PathLog.error("Cannot create thread with pitch {}".format(pitch))
return
@@ -288,6 +299,7 @@ class ObjectThreadMilling(PathCircularHoleBase.ObjectOp):
obj.ThreadType = self.ThreadTypeMetricInternal
obj.ThreadFit = 50
obj.Pitch = 1
obj.TPI = 0
obj.Passes = 1
obj.Direction = self.DirectionClimb
obj.LeadInOut = True
@@ -302,6 +314,7 @@ def SetupProperties():
setup.append("MajorDiameter")
setup.append("MinorDiameter")
setup.append("Pitch")
setup.append("TPI")
setup.append("Passes")
setup.append("Direction")
setup.append("LeadInOut")