Yep, That's the one I was talking about, thanks for the link and info on it working good for you. Looks like they have larger ones and may drill deeper now than those I asked about years ago? I remember then I was told something about around 200' being the limit, I see them say 300' now, also I think they bore a larger hole perhaps now too with the bigger unit.
I been thinking about drilling some holes for other reasons than a well and one of these small drilling units (or simlilar homebuilt) may work good for me for such things. Perhaps a handy item if you need lots of deep holes even if not actaull wells!
Can't hardly use a post hole digger here to set a post, and certainly not for a 10-20' hole. Besides wells, a unit like that may be good for drilling small deep holes for anchores and small tower bases. Dropping in lines for ground heat/cooling, other things too. Says the small unit drills 4" bore, larger unit 6" bore.
One thing I am thinking about, drill 4 6" holes 10' deep, drop in 2" heavywall pipe, fill hole with concrete. Weld on plate steel top to pipes, should make a nice fast cheap tower base for a pretty darn good tower. And drill 4 anchore holes for the guy wires, pipe and concrete in the holes.
I remember before also the unit can be set up to drill into the side of a hill somehow, not sure what I had read about that since it's been so long. May have been a limit to the angle or perhaps Horizontal? I had there sales package by mail years ago, before internet was common! LOL
http://www.deeprock.com/diy_faq.htm
Some interesting reading in the FAQ section. So far I have not found a price, I hate online companies that don't list prices, How can I buy one tonight if I don't know the price, ha ha.
As I recall, at the time you could buy most of the parts seperatly. If building a home built unit they may be a source for some harder to find parts and cutter bits.