A 72-year-old Waikato man has died after cutting himself with an angle grinder on a Bideford farm, near Masterton.

The accident took place at about 10.30am today on a farm on Maringi Rd.

Senior Sergeant Mike Sutton said the man had been working by himself on the bucket of a digger when he cut his leg with the angle grinder.

"He was working on that with the grinder and that is when the accident occurred and that has put a severe cut into his leg."

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The man got to his car but was unable to get to help.

He was found shortly afterwards by a farm worker.

"It's very tragic. We've referred the matter to the coroner," Mr Sutton said.

The man had been visiting family and helping out on the farm, and was not a farm worker, Mr Sutton said.

A post mortem would be conducted and police had referred the death to Worksafe.