Molding concrete pipe sections - GIF

[Frank S]

The cylinder has a piston and the piston is twisting, I didn't write it well enough, sorry.

Imagine a hydralic cylinder that has the piston sticking out both ends of the cylinder. If the piston extends through a gland on the non-visible side, it can be twisted. The piston is held in place by the glands on either end and the piston that slides inside the cylinder. The cylinder itself doesn't need to spin, and if it did, it wouldn't spin the load. That is why you need to spin just the piston shaft. And, you could apply a decent torque to the shaft to spin it.

It is a specialty application, but with proper design on both ends, it would work like this.

Is there another way to do it? Perhaps. You might, but I don't see any other bits to rotate the lowered head assembly. My explaination is fairly simple and would work.

There is a cut in the video (around the 4-5 second mark), you can see the stack of rings in the loader have a "jump". But that does not effect the simple explaination as far as I can tell...

To reudce wer on the piston and gland seals as well as the cylinder bore and the rod. the cylinder rod or piston shaft as it is sometimes called could be hollow with an internal shaft with thrust bearings attached to the mold head and the motor above.
I used to make hollow rod hyrdaulic cylinders with the rod extending from both ends. sold thjem to a company that made specialty hydraulic drill presses my cylinders were used as the quills with their spindles inside