Good day all, I'm a prospector needing to do some core sampling, and that's not cheap around here. But I have some tooling and some mechanical skills to undertake building a drill, for which a longer log splitter (pole splitter) would work as long as I get 5' of stroke. The engineering with the w beams is easy enough, but I though if I could apply a lot of torque to the drill string, I would have quite a reduction of my drill rig into a pretzel, maybe a 6"x8" rectangular tubing told 8x8 would be better, I just need to find a proper calculator. I'm hoping with the 24hp hydraulic supply I can maintain a 1200rpm drill speed in rock, I just need 250-300rpm in overburden, but if there is a cave-in I would like to keep the bit rotating at slow speed, like 100rpm which could be just over 1000ft pounds, which is why a square or rectangular tube wins over the w-beam.
With a single 4" bore cylinder I can have a retract force of 37,699 pounds, or 19tons. The drill head would bottom out 1' above ground, 5' stroke, plus drill head and water swivel for another 3' worst case, I would need a 12' beam and most of the force at near full extension would be about 8' from the bottom. I don't know drill centre of force from the beam since I have not decided on a motor, but I have been going with 12"
What dimension and thickness tube would I need or where can I find good calculator?
I'm also looking for the help in hydro pump and motor selection, since the 24 HP motor properly sized to pump and hydro motor at 3000psi would only give me 126ft pounds of torque at rock drilling speed, which is enough, but for max torque in clay and cave-in I would need a 2 stage or piston motor that can lower the rpm and increase torque.
Thanks in advance, Norbert
With a single 4" bore cylinder I can have a retract force of 37,699 pounds, or 19tons. The drill head would bottom out 1' above ground, 5' stroke, plus drill head and water swivel for another 3' worst case, I would need a 12' beam and most of the force at near full extension would be about 8' from the bottom. I don't know drill centre of force from the beam since I have not decided on a motor, but I have been going with 12"
What dimension and thickness tube would I need or where can I find good calculator?
I'm also looking for the help in hydro pump and motor selection, since the 24 HP motor properly sized to pump and hydro motor at 3000psi would only give me 126ft pounds of torque at rock drilling speed, which is enough, but for max torque in clay and cave-in I would need a 2 stage or piston motor that can lower the rpm and increase torque.
Thanks in advance, Norbert
