How to locate the centre of a workpiece
using a jenny caliper

     
     
 Shop for Jenny Calipers 
     
     
 You will need: A ruler A jenny caliper An outside caliper Workpiece You will need:
  • A ruler

  • A jenny caliper

  • An outside caliper

  • Workpiece

 
     
 Step 1 Measure the diameter of the workpiece with the outside caliper. Transfer this measurement to the ruler, then half it to find the radius of the workpiece. 

Step 1 - Measure diameter of workpiece

Measure the diameter of the workpiece with the outside caliper.

 

Transfer this measurement to the ruler, then half it to find the radius of the workpiece.

 
     
 Step 2 Set your jenny caliper to this distance. 

Step 2 - Set jenny caliper to required distance

Set your jenny caliper to this distance.

 
     
 Step 3 Set the locating lug to the edge of the workpiece.  

Step 3 - Position caliper on workpiece

Set the locating lug to the edge of the workpiece. 

 
     
 Step 4 Score four short, circular arcs onto the surface of the workpiece. These four arcs will form a rough square. 

Step 4 - Score arcs onto workpiece

Score four short, circular arcs onto the surface of the workpiece.

 

These four arcs will form a rough square.

 
     
 Step 5 Join the corners of the 'square' together. 

Step 5 - Join corners of square

Join the corners of the 'square' together.

 

The point at which the lines intersect will be the approximate centre of the workpiece.

 
     
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