Esempio n. 1
0
def cut_out(base):
    outer = gp_Circ2d(gp_OX2d(), top_radius - 1.75 * roller_diameter)
    inner = gp_Circ2d(gp_OX2d(), center_radius + 0.75 * roller_diameter)

    geom_outer = GCE2d_MakeCircle(outer).Value()
    geom_inner = GCE2d_MakeCircle(inner).Value()
    geom_inner.Reverse()

    base_angle = (2. * M_PI) / mounting_hole_count
    hole_angle = atan(hole_radius / mounting_radius)
    correction_angle = 3 * hole_angle

    left = gp_Lin2d(gp_Origin2d(), gp_DX2d())
    right = gp_Lin2d(gp_Origin2d(), gp_DX2d())
    left.Rotate(gp_Origin2d(), correction_angle)
    right.Rotate(gp_Origin2d(), base_angle - correction_angle)

    geom_left = GCE2d_MakeLine(left).Value()
    geom_right = GCE2d_MakeLine(right).Value()

    inter_1 = Geom2dAPI_InterCurveCurve(geom_outer, geom_left)
    inter_2 = Geom2dAPI_InterCurveCurve(geom_outer, geom_right)
    inter_3 = Geom2dAPI_InterCurveCurve(geom_inner, geom_right)
    inter_4 = Geom2dAPI_InterCurveCurve(geom_inner, geom_left)

    if inter_1.Point(1).X() > 0:
        p1 = inter_1.Point(1)
    else:
        p1 = inter_1.Point(2)

    if inter_2.Point(1).X() > 0:
        p2 = inter_2.Point(1)
    else:
        p2 = inter_2.Point(2)

    if inter_3.Point(1).X() > 0:
        p3 = inter_3.Point(1)
    else:
        p3 = inter_3.Point(2)

    if inter_4.Point(1).X() > 0:
        p4 = inter_4.Point(1)
    else:
        p4 = inter_4.Point(2)

    trimmed_outer = GCE2d_MakeArcOfCircle(outer, p1, p2).Value()
    trimmed_inner = GCE2d_MakeArcOfCircle(inner, p4, p3).Value()

    plane = gp_Pln(gp_Origin(), gp_DZ())

    arc1 = BRepBuilderAPI_MakeEdge(geomapi_To3d(trimmed_outer, plane)).Edge()

    lin1 = BRepBuilderAPI_MakeEdge(gp_Pnt(p2.X(), p2.Y(), 0),
                                   gp_Pnt(p3.X(), p3.Y(), 0)).Edge()

    arc2 = BRepBuilderAPI_MakeEdge(geomapi_To3d(trimmed_inner, plane)).Edge()

    lin2 = BRepBuilderAPI_MakeEdge(gp_Pnt(p4.X(), p4.Y(), 0),
                                   gp_Pnt(p1.X(), p1.Y(), 0)).Edge()

    cutout_wire = BRepBuilderAPI_MakeWire(arc1)
    cutout_wire.Add(lin1)
    cutout_wire.Add(arc2)
    cutout_wire.Add(lin2)

    # Turn the wire into a face
    cutout_face = BRepBuilderAPI_MakeFace(cutout_wire.Wire())
    filleted_face = BRepFilletAPI_MakeFillet2d(cutout_face.Face())

    explorer = BRepTools_WireExplorer(cutout_wire.Wire())
    while explorer.More():
        vertex = explorer.CurrentVertex()
        filleted_face.AddFillet(vertex, roller_radius)
        explorer.Next()

    cutout = BRepPrimAPI_MakePrism(filleted_face.Shape(),
                                   gp_Vec(0.0, 0.0, thickness)).Shape()

    result = base
    rotate = gp_Trsf()
    for i in range(0, mounting_hole_count):
        rotate.SetRotation(gp_OZ(), i * 2. * M_PI / mounting_hole_count)
        rotated_cutout = BRepBuilderAPI_Transform(cutout, rotate, True)

        result = BRepAlgoAPI_Cut(result,
                                 rotated_cutout.Shape()).Shape()

    return result
Esempio n. 2
0
def build_tooth():
    base_center = gp_Pnt2d(pitch_circle_radius + (tooth_radius - roller_radius), 0)
    base_circle = gp_Circ2d(gp_Ax2d(base_center, gp_Dir2d()), tooth_radius)
    trimmed_base = GCE2d_MakeArcOfCircle(base_circle,
                                         M_PI - (roller_contact_angle / 2.),
                                         M_PI).Value()
    trimmed_base.Reverse()  # just a trick
    p0 = trimmed_base.StartPoint()
    p1 = trimmed_base.EndPoint()

    # Determine the center of the profile circle
    x_distance = cos(roller_contact_angle / 2.) * (profile_radius + tooth_radius)
    y_distance = sin(roller_contact_angle / 2.) * (profile_radius + tooth_radius)
    profile_center = gp_Pnt2d(pitch_circle_radius - x_distance, y_distance)

    # Construct the profile circle gp_Circ2d
    profile_circle = gp_Circ2d(gp_Ax2d(profile_center, gp_Dir2d()),
                               profile_center.Distance(p1))
    geom_profile_circle = GCE2d_MakeCircle(profile_circle).Value()

    # Construct the outer circle gp_Circ2d
    outer_circle = gp_Circ2d(gp_Ax2d(gp_Pnt2d(0, 0), gp_Dir2d()), top_radius)
    geom_outer_circle = GCE2d_MakeCircle(outer_circle).Value()

    inter = Geom2dAPI_InterCurveCurve(geom_profile_circle, geom_outer_circle)
    num_points = inter.NbPoints()
    assert isinstance(p1, gp_Pnt2d)
    if num_points == 2:
        if p1.Distance(inter.Point(1)) < p1.Distance(inter.Point(2)):
            p2 = inter.Point(1)
        else:
            p2 = inter.Point(2)
    elif num_points == 1:
        p2 = inter.Point(1)
    else:
        sys.exit(-1)

    # Trim the profile circle and mirror
    trimmed_profile = GCE2d_MakeArcOfCircle(profile_circle, p1, p2).Value()

    # Calculate the outermost point
    p3 = gp_Pnt2d(cos(tooth_angle / 2.) * top_radius,
                  sin(tooth_angle / 2.) * top_radius)

    # and use it to create the third arc
    trimmed_outer = GCE2d_MakeArcOfCircle(outer_circle, p2, p3).Value()

    # Mirror and reverse the three arcs
    mirror_axis = gp_Ax2d(gp_Origin2d(), gp_DX2d().Rotated(tooth_angle / 2.))

    mirror_base = Geom2d_TrimmedCurve.DownCast(trimmed_base.Copy())
    mirror_profile = Geom2d_TrimmedCurve.DownCast(trimmed_profile.Copy())
    mirror_outer = Geom2d_TrimmedCurve.DownCast(trimmed_outer.Copy())

    mirror_base.Mirror(mirror_axis)
    mirror_profile.Mirror(mirror_axis)
    mirror_outer.Mirror(mirror_axis)

    mirror_base.Reverse()
    mirror_profile.Reverse()
    mirror_outer.Reverse()

    # Replace the two outer arcs with a single one
    outer_start = trimmed_outer.StartPoint()
    outer_mid = trimmed_outer.EndPoint()
    outer_end = mirror_outer.EndPoint()

    outer_arc = GCE2d_MakeArcOfCircle(outer_start, outer_mid, outer_end).Value()

    # Create an arc for the inside of the wedge
    inner_circle = gp_Circ2d(gp_Ax2d(gp_Pnt2d(0, 0), gp_Dir2d()),
                             top_radius - roller_diameter)
    inner_start = gp_Pnt2d(top_radius - roller_diameter, 0)
    inner_arc = GCE2d_MakeArcOfCircle(inner_circle, inner_start, tooth_angle).Value()
    inner_arc.Reverse()

    # Convert the 2D arcs and two extra lines to 3D edges
    plane = gp_Pln(gp_Origin(), gp_DZ())
    arc1 = BRepBuilderAPI_MakeEdge(geomapi_To3d(trimmed_base, plane)).Edge()
    arc2 = BRepBuilderAPI_MakeEdge(geomapi_To3d(trimmed_profile, plane)).Edge()
    arc3 = BRepBuilderAPI_MakeEdge(geomapi_To3d(outer_arc, plane)).Edge()
    arc4 = BRepBuilderAPI_MakeEdge(geomapi_To3d(mirror_profile, plane)).Edge()
    arc5 = BRepBuilderAPI_MakeEdge(geomapi_To3d(mirror_base, plane)).Edge()

    p4 = mirror_base.EndPoint()
    p5 = inner_arc.StartPoint()

    lin1 = BRepBuilderAPI_MakeEdge(gp_Pnt(p4.X(), p4.Y(), 0),
                                   gp_Pnt(p5.X(), p5.Y(), 0)).Edge()
    arc6 = BRepBuilderAPI_MakeEdge(geomapi_To3d(inner_arc, plane)).Edge()

    p6 = inner_arc.EndPoint()
    lin2 = BRepBuilderAPI_MakeEdge(gp_Pnt(p6.X(), p6.Y(), 0),
                                   gp_Pnt(p0.X(), p0.Y(), 0)).Edge()

    wire = BRepBuilderAPI_MakeWire(arc1)
    wire.Add(arc2)
    wire.Add(arc3)
    wire.Add(arc4)
    wire.Add(arc5)
    wire.Add(lin1)
    wire.Add(arc6)
    wire.Add(lin2)

    face = BRepBuilderAPI_MakeFace(wire.Wire())

    wedge = BRepPrimAPI_MakePrism(face.Shape(), gp_Vec(0.0, 0.0, thickness))

    return wedge.Shape()
Esempio n. 3
0
def round_tooth(wedge):
    round_x = 2.6
    round_z = 0.06 * pitch
    round_radius = pitch

    # Determine where the circle used for rounding has to start and stop
    p2d_1 = gp_Pnt2d(top_radius - round_x, 0)
    p2d_2 = gp_Pnt2d(top_radius, round_z)

    # Construct the rounding circle
    round_circle = GccAna_Circ2d2TanRad(p2d_1, p2d_2, round_radius, 0.01)
    if (round_circle.NbSolutions() != 2):
        sys.exit(-2)

    round_circle_2d_1 = round_circle.ThisSolution(1)
    round_circle_2d_2 = round_circle.ThisSolution(2)

    if (round_circle_2d_1.Position().Location().Coord()[1] >= 0):
        round_circle_2d = round_circle_2d_1
    else:
        round_circle_2d = round_circle_2d_2

    # Remove the arc used for rounding
    trimmed_circle = GCE2d_MakeArcOfCircle(round_circle_2d, p2d_1, p2d_2).Value()

    # Calculate extra points used to construct lines
    p1 = gp_Pnt(p2d_1.X(), 0, p2d_1.Y())
    p2 = gp_Pnt(p2d_2.X(), 0, p2d_2.Y())
    p3 = gp_Pnt(p2d_2.X() + 1, 0, p2d_2.Y())
    p4 = gp_Pnt(p2d_2.X() + 1, 0, p2d_1.Y() - 1)
    p5 = gp_Pnt(p2d_1.X(), 0, p2d_1.Y() - 1)

    # Convert the arc and four extra lines into 3D edges
    plane = gp_Pln(gp_Ax3(gp_Origin(), gp_DY().Reversed(), gp_DX()))
    arc1 = BRepBuilderAPI_MakeEdge(geomapi_To3d(trimmed_circle, plane)).Edge()
    lin1 = BRepBuilderAPI_MakeEdge(p2, p3).Edge()
    lin2 = BRepBuilderAPI_MakeEdge(p3, p4).Edge()
    lin3 = BRepBuilderAPI_MakeEdge(p4, p5).Edge()
    lin4 = BRepBuilderAPI_MakeEdge(p5, p1).Edge()

    # Make a wire composed of the edges
    round_wire = BRepBuilderAPI_MakeWire(arc1)
    round_wire.Add(lin1)
    round_wire.Add(lin2)
    round_wire.Add(lin3)
    round_wire.Add(lin4)

    # Turn the wire into a face
    round_face = BRepBuilderAPI_MakeFace(round_wire.Wire()).Shape()

    # Revolve the face around the Z axis over the tooth angle
    rounding_cut_1 = BRepPrimAPI_MakeRevol(round_face, gp_OZ(), tooth_angle).Shape()

    # Construct a mirrored copy of the first cutting shape
    mirror = gp_Trsf()
    mirror.SetMirror(gp_XOY())
    mirrored_cut_1 = BRepBuilderAPI_Transform(rounding_cut_1, mirror, True).Shape()

    # and translate it so that it ends up on the other side of the wedge
    translate = gp_Trsf()
    translate.SetTranslation(gp_Vec(0, 0, thickness))
    rounding_cut_2 = BRepBuilderAPI_Transform(mirrored_cut_1, translate, False).Shape()

    # Cut the wedge using the first and second cutting shape
    cut_1 = BRepAlgoAPI_Cut(wedge, rounding_cut_1).Shape()
    cut_2 = BRepAlgoAPI_Cut(cut_1, rounding_cut_2).Shape()

    return cut_2