Similar to a drillbit, the rotary coring bit consists of solid metal with diamonds or tungsten for cutting at the reservoir rock; but unlike a drillbit, a rotary coring bit has a hollow center.

To make a basic rock tumbler, all you really need to do is rotate a cylindrical chamber and let physics do its thing. Such contraptions are known as, unsurprisingly, rotary rock tumblers.

If your next DIY project involves grinding or carving into wood or metal, you'll need some good attachments for your rotary ...

Such contraptions are known as, unsurprisingly, rotary rock tumblers. But what [Fraens ... This gives the tumbler a bit more oomph, but at the cost of heating up the magnet.

Sandvik Mining and Rock Solutions Rotary Drills product manager Nellaiappan Subbiah said ... delivers increased pulldown force and weight on the bit, resulting in faster penetration rates. "Sandvik iE ...