Next we will construct the hob. Select Zoom Window and select the area shown here.
Select the Offset button and click on 'Line 1', drag to the left and type '100' and .
Click on the circle at P4 (the entity handles are displayed). Select the Rectangular Array button .
Before indicating the reference point you will notice that the Ribbon has changed and now displays the specific options for this command. Change the 'No X.' to 1 and 'No Y.' to 4 and pick the centre of the circle (P4) as the reference point.
Select the Rectangular Array button again and click on the circle at P2 (the entity handles are displayed). Now set the 'No X.' to 2 and 'No Y.' to 2, pick the centre of the circle as the reference point. This time as we have more than one item in both X and Y the easiest to define the next point is to use Direct Input, Simply type '250' and press for the X value and then type '250' and press for the value as well.
Now use the Offset command to offset circles 'C1' & 'C4' each by 70 and then by 80. Then offset circles 'C2' & 'C3' each by 50 then by 60. Remember the easiest way to define each offset value is with Direct Input, simply type the value and .
The hob is now complete and should look like the picture shown.