Drill that spins and feeds shaft forward, How does it work?
Drill that spins and feeds shaft forward, How does it work?
(OP)
The video below shows a drill that has a long center shaft which feeds in one operation and spins in another. The big difference with this drill compared to others is the shaft is not connected in line with the motor. The purpose of this seems so that the shaft can slide in and out and the motor can stay in on location. Can some one explain to me how they think this would work? It looks like the spinning of the drill is one operation controlled by the pulley and belt clearly seen and the forward backward motion is another operation that is controlled by some type of clutch mechanism?
https://www.youtube.com/watch?v=7A_Jwa1t6IA
Any help on this would be great.
Thank you
https://www.youtube.com/watch?v=7A_Jwa1t6IA
Any help on this would be great.
Thank you





RE: Drill that spins and feeds shaft forward, How does it work?
I'm guessing it's driven by friction both rotationally and axially.
Mike Halloran
Pembroke Pines, FL, USA
RE: Drill that spins and feeds shaft forward, How does it work?
There are probably a couple reason the drive motor is offset and uses a belt drive. First, it makes it easier to feed coolant thru the spindle to the drill bit. Second, it isolates the drive motor from excessive radial/axial forces produced by the very long and slender spindle shaft. Third, the belt drive provides overload protection for the motor when the drill bit seizes up. Rubber belts are cheap and easy to replace.
RE: Drill that spins and feeds shaft forward, How does it work?
RE: Drill that spins and feeds shaft forward, How does it work?
From the video it seems that the device the shaft is going through also moves it forward. Do you think it moves forward with some sort of gearing mechanism? 3DDave and Mikehalloran, do you think that hydraulic cylinder or polygon drive are at the other end of the shaft (off camera) or that the shaft is going through those? tubelna, do you think an operator off camera is pushing the shaft forward?
RE: Drill that spins and feeds shaft forward, How does it work?
RE: Drill that spins and feeds shaft forward, How does it work?
The force required to push a large bit that far, that fast, is much more than could be provided by one average man.
RE: Drill that spins and feeds shaft forward, How does it work?
RE: Drill that spins and feeds shaft forward, How does it work?
What type of hydraulic device would be pushing this forward. My biggest question about this is how does the shaft push through the center? If it was threaded I could see it being pushed with some sort of gearing mechanism powered by a hydraulic motor. The shaft does not appear to be threaded so what is actually grabbing the shaft and pushing it forward??
RE: Drill that spins and feeds shaft forward, How does it work?
Put a piston on the distal end or don't; it just affects the effective area; either way, pushing oil into the cap squirts the shaft out.
Of course, that's not the only way to do it. I followed a couple of links from the video to a competitor's machine that uses a double caterpillar friction drive for pushing and pulling the drill shank, which in that case is just a piece of flexible tubing or a very stiff hose.
Mike Halloran
Pembroke Pines, FL, USA
RE: Drill that spins and feeds shaft forward, How does it work?
Ted