diff --git a/app/data.py b/app/data.py
index 4c251e3..ab58b9c 100644
--- a/app/data.py
+++ b/app/data.py
@@ -54,7 +54,7 @@ def init_project_data():
             # soldering toolpath
             "SolderToolpath": [ # array with soldering points, referencing nc drill tool and position in list, selected soldering profile, attributes if reference point
                         # sort this array with PanelRef1 first, following closest neigbourst on optimize soldering points, do not sort imported nc hits and nc tools
-                        # { "NCId" : 0, "NCPositionX": 0, "NCPositionY": 0, "NCTool":0, "PanelRef1": True, "PanelRef2":False, "SolderingProfile":-1, "ToolPathSorting" } 
+                        # { "NCId" : 0, "NCPositionX": 0, "NCPositionY": 0, "NCDiameter":0, "NCTool":0, "PanelRef1": True, "PanelRef2":False, "SolderingProfile":-1, "ToolPathSorting" } 
                         ]
             # excellon
             "NCSolderSide": "Top", # let user choose on import of nc file
diff --git a/app/excellon.py b/app/excellon.py
index 383a8e1..2012464 100644
--- a/app/excellon.py
+++ b/app/excellon.py
@@ -47,12 +47,14 @@ def convert_to_json(ncdata):
         hit[h]=ncdata.hits[h]
         tool = hit.tool.number
         pos=hit.position
+        dia=hit.diameter
         soldertoolpath.append(
             {# use index as id
              "NCId" : h,
              "NCPositionX": pos.x,
              "NCPositionY": pos.y,
              "NCTool" : tool,
+             "NCDiameter": dia,
              "PanelRef1": False, 
              "PanelRef2":False, 
              # no soldering
@@ -172,3 +174,31 @@ def optimize_soldertoolpath(soldertoolpath,ncdata)
             sortingIndex+=1
     return soldertoolpath
 
+# Get nc tool area
+def get_nc_tool_area(soldertoolpath)
+    xmin=0
+    xmax=0
+    ymin=0
+    ymax=0
+    for e, elem in enumerate(solderingtoolpath):
+        tp=solderingtoolpath[e]
+        xemin=tp['NCPositionX']-(tp['NCDiameter']/2.0)
+        xemax=tp['NCPositionX']+(tp['NCDiameter']/2.0)
+        yemin=tp['NCPositionY']-(tp['NCDiameter']/2.0)
+        yemax=tp['NCPositionY']+(tp['NCDiameter']/2.0)
+        if e==0 OR xemin<xmin:
+            xmin=xemin
+        if e==0 OR xemax>xmax:
+            xmax=xemax
+        if e==0 OR yemin<ymin:
+            ymin=yemin
+        if e==0 OR yemax<ymax:
+            ymax=yemax
+    return xmin, xmax, ymin, ymax
+
+# Get nc tool area
+def get_nc_tool_position(soldertoolpath,x,y,w,h)
+    xmin, xmax, ymin, ymax=get_nc_tool_area(soldertoolpath)
+    xt=(x/w*(xmax-xmin))+xmin
+    xt=(y/h*(ymax-ymin))+ymin
+    return xt,yt