Revealing mistake: When the lawn mower the heroes send off as a diversion crashes you can see a wire pulling it. (01:01:30)
Tremors (1990)
Plot summary
Directed by: Ron Underwood
Starring: Kevin Bacon, Fred Ward, Michael Gross, Finn Carter
Giant worms begin terrorizing Perfection, Nevada. The humans find out that they can't see but find their way around using their sense of hearing. They are called Graboids. One of them bursts into Burt's basement and Burt blasts it full of holes with various guns and finally kills it with the Elephant Gun. Val takes the CAT Bulldozer with a trailer full of people toward mountains. The graboids dig a trap and they all fall in. Burt throws TNT and runs for some rocks. While there the throw rocks and some TNT onto a patch of ground. The graboid eats it.
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Chosen answer: The machine is a vibrating case cleaner, which is used to polish the brass casings of pistol and rifle ammo. The "dirt" is actually an abrasive polishing compound.
BGraz