Help me understand "Downforce"

[The Dougster]

My PHD doesn't work very well .. I'm convinced it's limiting itself... the geometry simply won't let it go any deeper... I need an extension... right?

 

[Tom_H]

...if it was clear as mud I wouldn't have a problem, but it's caliche!

wftree - you know those augers were never meant to drill through bedrock, right?

While not bedrock, Caliche, Ironpan, and Duripan are among the hardest hardpans. While they do not require rock drilling gear, they can be augered with a standard tractor PTO driven PHD if they have two things: downpressure and carbide tips and teeth. The link below is to a post where I show my less expensive method of downpressure. The following post on the subsequent page shows my Pengo auger with carbide bit and teeth.

http://www.tractorbynet.com/forums/attachments/148963-post-hole-digger-warning-5.html#post1771295