There's an easier way, drive a decent size (a wee bit bigger than you final post) 6-8' post first, pull it out once you get it 4' in (in really hard going pull it out after 2-3' - reduces the strain on the gear) and you've got a pilot hole. I can get 4.8M post in with my 3.6M Kinghitter using this approach, and it's safer, once the post is in its pilot hole it can't fall over and clobber someone.
Piece of cake then with post driver. Deer strainers come in 3.6m and poles at 4.2 and more. We did a tin fence with lean-to shed twenty odd metres long with 3.5 m wide and 2.8 high forklift bays for pallet storage. Worked very well. Digging and concreting is a chore compared to getting them driven
The old "rule of thumb" for driven shed poles was 1.2M inbedment in good ground . . . .
Sounds a more desirable option then, at least for the poleshed
I bought the single 200mm borer from the Tool Shed. I got it to do my fence so wasn’t looking for super quality. I have been extremely impressed to be honest. It was only a couple of hundred from memory. It’s now done my 50m of fence, my 50m2 deck and about 100m of fencing for mates. Still going strong. I don’t know how it would last over years, but certainly beats hiring one. I found it has plenty of grunt, if it hits a decent tree root you best be holding on strong!
Has anyone had any experience with any of the battery powered borers?
just a thought we built a big set of circular cattle yards at a station I worked on could hold 500 cattle so instead of us drilling all the holes we got the power board in -marked out all the holes and only took them about 3 hours to drill all the holes we needed with a truck mounter borer normally used to drill power poles in- easy peasy
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