Run a chalk or scribe line from a corner of one square along the length of the log to the corresponding corner at the opposite end.
3. Make Cross Cuts
Using a felling ax, make a series of gashes across the grain below the line that you drew down the length of the log.The depth of each gash should stop just shy of the line of your cross-section square.
4. Hew to the Line
Now, use a broadax to "hew to the line," with successive, steeply angled cuts taking the roundness out of the log just under the chalk line.