I need to make lengthwise cuts down the entire length of an 8 foot long 4"x4" fence post like so:
In that diagram the blue lines represent the cuts I need to make, and the purple areas are the areas that will be removed by the cuts.
I (likely) don't have access to a table saw, so I'm hoping there is a solution involving a circular saw or something similar. It needs to be something that can cut 4" thick wood length-wise. In addition to the tool of choice, the larger problem is holding the saw at the correct angle for the duration of the cut. I would imagine some kind of jig/railing needs to be put in place, but I have no idea what.
Any ideas? Thanks in advance!