Clamshell diggers and power augers both dig post holes. For small jobs, the manual tool works fine but takes a little longer. Invite a friend to share the workload, but if you plan on the power digger arrange to have someone with you. The clamshell tool doesn't cost much and it's a good addition for your outside work tools.
Spread the blades apart and plunge straight into the dirt driving as far as it goes. Wear gloves for protection against blisters and safety glasses.
2
Apply pressure by moving the two handles away from each other and lift the dirt caught between the clamshell blades then drop the load to the side, far enough away so it won't drop back into the hole.
3
Rotate the blade in a circle then repeat Steps 1 and 2.
4
Dig until you're below the frost level. Typically, 3 to 4 feet but check with a local builder or your Department of Public Works, this keeps the post from rising up.
5
Place a couple shovels of gravel at the base of the hole or large rock for drainage.
Tips & Warnings
For clay or hard soil, first soak the ground with water. Dig several inches and let the hose water penetrate to loosen the dirt.
Use your legs to dig the post hole by bending when driving the digger.
Rent an auger from the rental store or home and garden shop for hard clay or if the job requires many holes.
Check with your city or residential association for any zoning ordinance or permit needed to dig for your project.
Call your gas, electric and water utilities to come out and mark any areas where pipes or conduits run before you dig.
