diff --git a/freecad/gears/cycloidgear.py b/freecad/gears/cycloidgear.py
index bfc8806..782bd74 100644
--- a/freecad/gears/cycloidgear.py
+++ b/freecad/gears/cycloidgear.py
@@ -110,23 +110,23 @@ class CycloidGear(BaseGear):
 
     def add_fillet_properties(self, obj):
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "head_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-head, radius = head_fillet x module",
             ),
-        )
+        ).head_fillet = (0.0, 0.0, 1000.0, 0.01)
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "root_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-root, radius = root_fillet x module",
             ),
-        )
+        ).root_fillet = (0.0, 0.0, 1000.0, 0.01)
 
     def add_tolerance_properties(self, obj):
         obj.addProperty(
diff --git a/freecad/gears/cycloidgearrack.py b/freecad/gears/cycloidgearrack.py
index 93b8fb6..545222f 100644
--- a/freecad/gears/cycloidgearrack.py
+++ b/freecad/gears/cycloidgearrack.py
@@ -166,23 +166,23 @@ class CycloidGearRack(BaseGear):
 
     def add_fillet_properties(self, obj):
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "head_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-head, radius = head_fillet x module",
             ),
-        )
+        ).head_fillet = (0.0, 0.0, 1000.0, 0.01)
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "root_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-root, radius = root_fillet x module",
             ),
-        )
+        ).root_fillet = (0.0, 0.0, 1000.0, 0.01)
 
     def generate_gear_shape(self, obj):
         numpoints = obj.numpoints
diff --git a/freecad/gears/internalinvolutegear.py b/freecad/gears/internalinvolutegear.py
index 83e3843..43c0fac 100644
--- a/freecad/gears/internalinvolutegear.py
+++ b/freecad/gears/internalinvolutegear.py
@@ -175,23 +175,23 @@ class InternalInvoluteGear(BaseGear):
 
     def add_fillet_properties(self, obj):
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "head_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-head, radius = head_fillet x module",
             ),
-        )
+        ).head_fillet = (0.0, 0.0, 1000.0, 0.01)
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "root_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-root, radius = root_fillet x module",
             ),
-        )
+        ).root_fillet = (0.0, 0.0, 1000.0, 0.01)
 
     def add_tolerance_properties(self, obj):
         obj.addProperty(
diff --git a/freecad/gears/involutegear.py b/freecad/gears/involutegear.py
index 59bb6bc..8fc01c5 100644
--- a/freecad/gears/involutegear.py
+++ b/freecad/gears/involutegear.py
@@ -121,23 +121,23 @@ class InvoluteGear(BaseGear):
             QT_TRANSLATE_NOOP("App::Property", "undercut"),
         )
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "head_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-head, radius = head_fillet x module",
             ),
-        )
+        ).head_fillet = (0.0, 0.0, 1000.0, 0.01)
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "root_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-root, radius = root_fillet x module",
             ),
-        )
+        ).root_fillet = (0.0, 0.0, 1000.0, 0.01)
 
     def add_helical_properties(self, obj):
         obj.addProperty(
diff --git a/freecad/gears/involutegearrack.py b/freecad/gears/involutegearrack.py
index b385190..cde7168 100644
--- a/freecad/gears/involutegearrack.py
+++ b/freecad/gears/involutegearrack.py
@@ -162,23 +162,23 @@ class InvoluteGearRack(BaseGear):
 
     def add_fillet_properties(self, obj):
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "head_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-head, radius = head_fillet x module",
             ),
-        )
+        ).head_fillet = (0.0, 0.0, 1000.0, 0.01)
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "root_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-root, radius = root_fillet x module",
             ),
-        )
+        ).root_fillet = (0.0, 0.0, 1000.0, 0.01)
 
     def generate_gear_shape(self, obj):
         obj.rack.m = obj.module.Value
diff --git a/freecad/gears/timinggear_t.py b/freecad/gears/timinggear_t.py
index 9c03c3b..43cff5a 100644
--- a/freecad/gears/timinggear_t.py
+++ b/freecad/gears/timinggear_t.py
@@ -69,23 +69,23 @@ class TimingGearT(BaseGear):
             ),
         )
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "head_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-head, radius = head_fillet x module",
             ),
-        )
+        ).head_fillet = (0.0, 0.0, 1000.0, 0.01)
         obj.addProperty(
-            "App::PropertyFloat",
+            "App::PropertyFloatConstraint",
             "root_fillet",
             "fillets",
             QT_TRANSLATE_NOOP(
                 "App::Property",
                 "a fillet for the tooth-root, radius = root_fillet x module",
             ),
-        )
+        ).root_fillet = (0.0, 0.0, 1000.0, 0.01)
         obj.addProperty(
             "App::PropertyAngle",
             "alpha",