Civil Engineering Reference
In-Depth Information
casting process. You should not be too far away from the centre of the dimple though.
Move in the cross axis to 0.5in and centre drill the next hole. Move to the 1.0in position
and again centre drill the hole. Move to the 1.3in position and centre the last of this
row of holes.
Move to the 1.375in position and then move to the 1.037in axis in the longitudinal
direction and centre drill the hole. Finally move to the 1.633in position and drill this
hole. We now have holes A, B, C, D, E and F centre drilled.
Centre drilling G-L
Now we go back to the start point at the top left of the component. Move over to the
0.125in position and move along to the 1.037in position. Centre drill the G hole, then
move along to the 1.633in (H) hole and centre drill again. Now you can move over to
0.2in in the cross axis and to 2.475in in the longitudinal axis. Centre drill the I hole and
move over in the cross axis to centre drill holes J, K and L.
Fig. 11.20. Spot the first of the holes.
