how to use hydraulic rock splitter to make a symmetrical opening

use hydraulic rock splitter to make a symmetrical opening

In order to maintain a symetrical 8' diameter opening, drill 1-3/4'' holes 24'' deep a foot apart around the circuference. This could be done beforehand at all six locations.

Then try to put in either a center hole 4'' or larger, or line drill in the center 5 to 8 1-3/4'' holes to give you a face toward which to work.

Pattern the rest of your holes as shown a foot to a foot and a half on center, alway pushing to the center core. The broken line show how the splits occur. As the center gets wider, you keep moving to the next line of holes. There is very little chance that the split will continue past the outer circle and if they appear to be going past, you can stop the operation of the tool immediately. In most cases, especially on concrete, you have control of the direction of the split.