diff --git a/src/Mod/OpenSCAD/OpenSCADFeatures.py b/src/Mod/OpenSCAD/OpenSCADFeatures.py
index a3b0b306a1..433cf0d83f 100644
--- a/src/Mod/OpenSCAD/OpenSCADFeatures.py
+++ b/src/Mod/OpenSCAD/OpenSCADFeatures.py
@@ -434,15 +434,6 @@ class Twist:
 
                     auxiliary_spine = Part.makeHelix(pitch, height, radius, 0.0, left_handed)
 
-                    # OCC versions before 7.5 had a problem with using a helix as the auxilliary spine, so approximate
-                    # it piecewise
-                    occ_version = Part.OCC_VERSION.split(".")
-                    if int(occ_version[0]) <= 7 and int(occ_version[1]) < 5:
-                        num_points = int(max(3,num_revolutions * 36)) # Every ten degrees is adequate
-                        wire = auxiliary_spine.Wires[0]
-                        points = wire.discretize(Number=num_points)
-                        auxiliary_spine = Part.makePolygon(points)
-                    
                 faces = [lower_face,upper_face]
                 for wire1,wire2 in zip(lower_face.Wires,upper_face.Wires):
                     pipe_shell = Part.BRepOffsetAPI.MakePipeShell(spine)
diff --git a/src/Mod/OpenSCAD/importCSG.py b/src/Mod/OpenSCAD/importCSG.py
index 315eb94d44..432a4d70a5 100644
--- a/src/Mod/OpenSCAD/importCSG.py
+++ b/src/Mod/OpenSCAD/importCSG.py
@@ -1322,25 +1322,27 @@ def p_polyhedron_action(p) :
 def p_projection_action(p) :
     'projection_action : projection LPAREN keywordargument_list RPAREN OBRACE block_list EBRACE'
     if printverbose: print('Projection')
-    if p[3]['cut']=='true' :
-        planedim=1e9 # large but finite
-        #infinite planes look bad in the GUI
-        planename='xy_plane_used_for_project_cut'
-        obj=doc.addObject('Part::MultiCommon','projection_cut')
-        plane = doc.getObject(planename)
-        if not plane:
-            plane=doc.addObject("Part::Plane",planename)
-            plane.Length=planedim*2
-            plane.Width=planedim*2
-            plane.Placement = FreeCAD.Placement(FreeCAD.Vector(\
-                     -planedim,-planedim,0),FreeCAD.Rotation())
-            if gui:
-                plane.ViewObject.hide()
+
+    doc.recompute()
+    bbox = p[6][0].Shape.BoundBox
+    for shape in p[6]:
+        bbox.add(shape.Shape.BoundBox)
+    print (bbox)
+    plane = doc.addObject("Part::Plane","xy_plane_used_for_projection")
+    plane.Length = bbox.XLength
+    plane.Width = bbox.YLength
+    plane.Placement = FreeCAD.Placement(FreeCAD.Vector(\
+                     bbox.XMin,bbox.YMin,0),FreeCAD.Rotation())
+    if gui:
+        plane.ViewObject.hide()
+
+    if p[3]['cut'] == 'true' :
+        obj = doc.addObject('Part::MultiCommon','projection_cut')
         if (len(p[6]) > 1):
             subobj = [fuse(p[6],"projection_cut_implicit_group")]
         else:
             subobj = p[6]
-        obj.Shapes = [plane]+subobj
+        obj.Shapes = [plane] + subobj
         if gui:
             subobj[0].ViewObject.hide()
         p[0] = [obj]
@@ -1348,6 +1350,6 @@ def p_projection_action(p) :
         if gui and not FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/OpenSCAD").\
                 GetBool('usePlaceholderForUnsupported'):
             from PySide import QtGui
-            QtGui.QMessageBox.critical(None, translate('OpenSCAD',"Unsupported Function")+" : "+p[1],translate('OpenSCAD',"Press OK"))
+            QtGui.QMessageBox.critical(None, translate('OpenSCAD',"Unsupported Function") + " : " + p[1],translate('OpenSCAD',"Press OK"))
         else:
             p[0] = [placeholder(p[1],p[6],p[3])]