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fix: Hirth joint mating line

This commit is contained in:
Leni Aniva 2024-06-19 16:14:49 -07:00
parent a3f2b01b8c
commit 75c06585ed
Signed by: aniva
GPG Key ID: 4D9B1C8D10EA4C50
1 changed files with 12 additions and 9 deletions
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21
nhf/joints.py
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@ -8,7 +8,8 @@ def hirth_joint(radius=60,
base_height=20, base_height=20,
n_tooth=16, n_tooth=16,
tooth_height=16, tooth_height=16,
tooth_height_inner=2): tooth_height_inner=2,
tol=0.01):
""" """
Creates a cylindrical Hirth Joint Creates a cylindrical Hirth Joint
""" """
@ -26,14 +27,16 @@ def hirth_joint(radius=60,
# triangles. # triangles.
outer = [ outer = [
(radius * math.tan(theta), 0), (radius * math.tan(theta), 0),
(radius * math.tan(theta) - tol, 0),
(0, tooth_height), (0, tooth_height),
(-radius * math.tan(theta) + tol, 0),
(-radius * math.tan(theta), 0), (-radius * math.tan(theta), 0),
] ]
inner = [ inner = [
(radius_inner * math.sin(theta), 0), (radius_inner * math.sin(theta), 0),
(radius_inner * math.sin(theta), inner_raise - tooth_height_inner / 2), (radius_inner * math.sin(theta), inner_raise),
(0, inner_raise + tooth_height_inner / 2), (0, inner_raise + tooth_height_inner),
(-radius_inner * math.sin(theta), inner_raise - tooth_height_inner / 2), (-radius_inner * math.sin(theta), inner_raise),
(-radius_inner * math.sin(theta), 0), (-radius_inner * math.sin(theta), 0),
] ]
tooth = ( tooth = (
@ -43,13 +46,13 @@ def hirth_joint(radius=60,
.workplane(offset=radius - radius_inner) .workplane(offset=radius - radius_inner)
.polyline(outer) .polyline(outer)
.close() .close()
.loft(combine=True) .loft(ruled=True, combine=True)
.val() .val()
) )
tooth_centre_radius = radius_inner * math.cos(theta) tooth_centre_radius = radius_inner * math.cos(theta)
teeth = ( teeth = (
Cq.Workplane('XY') Cq.Workplane('XY')
.polarArray(radius=radius_inner, startAngle=0, angle=360, count=n_tooth) .polarArray(radius=tooth_centre_radius, startAngle=0, angle=360, count=n_tooth)
.eachpoint(lambda loc: tooth.located(loc)) .eachpoint(lambda loc: tooth.located(loc))
.intersect(Cq.Solid.makeCylinder( .intersect(Cq.Solid.makeCylinder(
height=base_height + tooth_height, height=base_height + tooth_height,
@ -67,7 +70,7 @@ def hirth_joint(radius=60,
.clean() .clean()
) )
#base.workplane(offset=tooth_height/2).circle(radius=radius,forConstruction=True).tag("mate") #base.workplane(offset=tooth_height/2).circle(radius=radius,forConstruction=True).tag("mate")
base.polyline([(0, 0, 0), (0, 0, 1)], forConstruction=True).tag("mate") base.polyline([(0, 0, base_height), (0, 0, base_height+tooth_height)], forConstruction=True).tag("mate")
return base return base
def hirth_assembly(): def hirth_assembly():
@ -90,8 +93,8 @@ def hirth_assembly():
result = ( result = (
Cq.Assembly() Cq.Assembly()
.add(obj1, name="obj1", color=Cq.Color(0.8,0.8,0.5,0.3)) .add(obj1, name="obj1", color=Cq.Color(0.8,0.8,0.5,0.3))
.add(obj2, name="obj2", color=Cq.Color(0.5,0.5,0.5,0.3), loc=Cq.Location((0,0,80))) .add(obj2, name="obj2", color=Cq.Color(0.5,0.5,0.5,0.3))
.constrain("obj1?mate", "obj2?mate", "Axis") .constrain("obj1?mate", "obj2?mate", "Plane")
.solve() .solve()
) )
return result return result