The mixed martial arts fighter was taken to Middlemore Hospital where plastic surgeon Zak Moaveni operated on him.
Friend Willie Beggs said the accident was unusual because Innes was following correct procedures. "The bandsaw just flicked it out," Beggs said.
"I texted him yesterday because this guy does not drink alcohol or take drugs, not even prescribed stuff, so I said 'you have got to take pain relief this time'. He said he would."
In another unusual accident reported this month boat racing competitor Stephen Appleby had his stomach torn open by an anchor, leaving him with intestines spilling out.
Late last year a man in his 50s received serious groin injuries when an axe-head flew off its handle during a wood chopping competition at the Christchurch A&P show.