diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index 690a2e1..60d8756 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/MachMgr.h b/MachMgr.h
index f84545f..a6d1384 100644
--- a/MachMgr.h
+++ b/MachMgr.h
@@ -171,6 +171,7 @@ class MachMgr : public IMachMgr
       bool TdbGetCurrToolParam( int nType, double& dVal) const override ;
       bool TdbGetCurrToolParam( int nType, std::string& sVal) const override ;
       bool TdbGetCurrToolMaxDepth( double& dMaxDepth) const override ;
+      bool TdbGetCurrToolThDiam( double& dThDiam) const override ;
       int  TdbCurrToolDraw( int nGenCtx, int nToolCtx) const override ;
       bool TdbReload( void) override ;
       bool TdbSave( void) const override ;
diff --git a/MachMgrDBTools.cpp b/MachMgrDBTools.cpp
index 68b26fa..58c89a7 100644
--- a/MachMgrDBTools.cpp
+++ b/MachMgrDBTools.cpp
@@ -263,6 +263,18 @@ MachMgr::TdbGetCurrToolMaxDepth( double& dMaxDepth) const
    return pTsMgr->GetCurrToolMaxDepth( dSafe, dMaxDepth) ;
 }
 
+//----------------------------------------------------------------------------
+bool
+MachMgr::TdbGetCurrToolThDiam( double& dThDiam) const
+{
+  // recupero il gestore di utensili della macchina corrente
+   ToolsMgr* pTsMgr = GetCurrToolsMgr() ;
+   if ( pTsMgr == nullptr)
+      return false ;
+  // recupero il diametro del portautensili
+   return pTsMgr->GetCurrToolThDiam( dThDiam) ;
+}
+
 //----------------------------------------------------------------------------
 int
 MachMgr::TdbCurrToolDraw( int nGenCtx, int nToolCtx) const
diff --git a/ToolsMgr.cpp b/ToolsMgr.cpp
index e77e998..22d490c 100644
--- a/ToolsMgr.cpp
+++ b/ToolsMgr.cpp
@@ -714,3 +714,39 @@ ToolsMgr::GetCurrToolMaxDepth( double dSafe, double& dMaxDepth) const
 
    return false ;
 }
+
+//----------------------------------------------------------------------------
+bool
+ToolsMgr::GetCurrToolThDiam( double& dThDiam) const
+{
+  // verifico esistenza utensile corrente
+   if ( ! m_bCurrTool)
+      return false ;
+
+  // se punta a forare, lama, fresa o scalpello
+   if ( ( m_tdCurrTool.m_nType & TF_DRILLBIT) != 0  ||
+        ( m_tdCurrTool.m_nType & TF_SAWBLADE) != 0  ||
+        ( m_tdCurrTool.m_nType & TF_MILL) != 0  ||
+        ( m_tdCurrTool.m_nType & TF_CHISEL) != 0) {
+     // recupero le dimensioni del porta utensili
+      double dTHoldLen = 0 ;
+      double dTHoldDiam = 0 ;
+      if ( ! GetValInNotes( m_tdCurrTool.m_sSysNotes, TSI_THLEN, dTHoldLen)  ||
+           ! GetValInNotes( m_tdCurrTool.m_sSysNotes, TSI_THDIAM, dTHoldDiam)) {
+         (const_cast<ToolsMgr*>(this))->SaveCurrTool() ;
+         Save() ;  
+         GetValInNotes( m_tdCurrTool.m_sSysNotes, TSI_THLEN, dTHoldLen) ;
+         GetValInNotes( m_tdCurrTool.m_sSysNotes, TSI_THDIAM, dTHoldDiam) ;
+      }
+      dThDiam = dTHoldDiam ;
+      return true ;
+   }
+  // se mortasatrice/sega a catena o waterjet
+   else if ( ( m_tdCurrTool.m_nType & TF_MORTISE) != 0  ||
+             ( m_tdCurrTool.m_nType & TF_WATERJET) != 0) {
+      dThDiam = 0 ;
+      return true ;
+   }
+
+   return false ;
+}
diff --git a/ToolsMgr.h b/ToolsMgr.h
index 95b03cd..3541715 100644
--- a/ToolsMgr.h
+++ b/ToolsMgr.h
@@ -52,6 +52,7 @@ class ToolsMgr
       bool GetCurrToolParam( int nType, double& dVal) const ;
       bool GetCurrToolParam( int nType, std::string& sVal) const ;
       bool GetCurrToolMaxDepth( double dSafe, double& dMaxDepth) const ;
+      bool GetCurrToolThDiam( double& dThDiam) const ;
       const ToolData* GetCurrTool( void) const
                { if ( m_bCurrTool)
                     return &m_tdCurrTool ;