How to use a centre head

 
     
     
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 Using the centre head to find the centre of a circular object; combination square set, centre finder, rule, ruler, blade 

Step 1 - Place combination square set on object

Place the combination square set on the circular object with the centre head attached.

 
     
 Marking the diameter of the circle with a scriber; combination square set, rule, ruler, blade 

Step 2 - Mark diameter line 

Mark the diameter of the object along the rule.

 
     
 The circle after a second diameter line has been marked; combination square set, centre head, centre finder 

Step 3 - Mark second diameter line 

Move the combination square set and mark a second diameter line (you may choose to do this at roughly 90 degrees to the first line). Where the lines cross each other should mark the centre of the object.

 
     
 Marking more than two diameter lines (three in this instance); combination square set, centre head, centre finder 

Step 4 - Identify centre of circle (if necessary) 

Sometimes the object may not be an exact circle. When this happens, marking more than two diameter lines may show that they do not all cross at the same point. You can then make a judgment on where the centre actually is.

 
     
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