At the time of the accident the machine had no guarding in place to protect workers from moving parts when working with long lengths of tubing, as Mr Vink was doing at the time he was injured.
Industrial Tube should have fitted proper guards to the machine, said WorkSafe New Zealand's Chief Investigator, Keith Stewart.
"The company should have done a full hazard assessment following the modification work. That would have identified the risk posed by a lack of proper guards."
Mr Stewart said an emergency stop button should also have been installed.
"Accidents with unguarded or inadequately guarded machines are all too common.
"This conviction and fine is a reminder to all companies to take their obligations seriously and ensure their machines are safe to use," he said.