diff --git a/src/Mod/Part/App/PrimitiveFeature.cpp b/src/Mod/Part/App/PrimitiveFeature.cpp
index 4841f871f6..119078c35f 100644
--- a/src/Mod/Part/App/PrimitiveFeature.cpp
+++ b/src/Mod/Part/App/PrimitiveFeature.cpp
@@ -74,7 +74,7 @@
 
 
 namespace Part {
-    const App::PropertyQuantityConstraint::Constraints apexRange   = {0.0,90.0,0.1};
+    const App::PropertyQuantityConstraint::Constraints apexRange   = {-90.0,90.0,0.1};
     const App::PropertyQuantityConstraint::Constraints torusRangeV = {-180.0,180.0,1.0};
     const App::PropertyQuantityConstraint::Constraints angleRangeU = {0.0,360.0,1.0};
     const App::PropertyQuantityConstraint::Constraints angleRangeV = {-90.0,90.0,1.0};
@@ -801,7 +801,7 @@ Helix::Helix(void)
     Height.setConstraints(&quantityRange);
     ADD_PROPERTY_TYPE(Radius,(1.0),"Helix",App::Prop_None,"The radius of the helix");
     Radius.setConstraints(&quantityRange);
-    ADD_PROPERTY_TYPE(Angle,(0.0),"Helix",App::Prop_None,"If angle is > 0 a conical otherwise a cylindircal surface is used");
+    ADD_PROPERTY_TYPE(Angle,(0.0),"Helix",App::Prop_None,"If angle is != 0 a conical otherwise a cylindircal surface is used");
     Angle.setConstraints(&apexRange);
     ADD_PROPERTY_TYPE(LocalCoord,(long(0)),"Coordinate System",App::Prop_None,"Orientation of the local coordinate system of the helix");
     LocalCoord.setEnums(LocalCSEnums);
diff --git a/src/Mod/Part/Gui/DlgPrimitives.cpp b/src/Mod/Part/Gui/DlgPrimitives.cpp
index 9fef631f58..f1a410bfbe 100644
--- a/src/Mod/Part/Gui/DlgPrimitives.cpp
+++ b/src/Mod/Part/Gui/DlgPrimitives.cpp
@@ -261,7 +261,7 @@ DlgPrimitives::DlgPrimitives(QWidget* parent, Part::Primitive* feature)
     ui->helixPitch->setRange(0, INT_MAX);
     ui->helixHeight->setRange(0, INT_MAX);
     ui->helixRadius->setRange(0, INT_MAX);
-    ui->helixAngle->setRange(0, 90);
+    ui->helixAngle->setRange(-90, 90);
     // circle
     ui->circleRadius->setRange(0, INT_MAX);
     ui->circleAngle0->setRange(0, 360);
@@ -560,7 +560,7 @@ DlgPrimitives::DlgPrimitives(QWidget* parent, Part::Primitive* feature)
     }
 }
 
-/*  
+/*
  *  Destroys the object and frees any allocated resources
  */
 DlgPrimitives::~DlgPrimitives()
@@ -1937,7 +1937,7 @@ TaskPrimitives::~TaskPrimitives()
 }
 
 QDialogButtonBox::StandardButtons TaskPrimitives::getStandardButtons() const
-{ 
+{
     return QDialogButtonBox::Close|
            QDialogButtonBox::Ok;
 }