I don't know if it was really of any benefit but when I was finished I used to slacken off two turns and retighten two turns the next time I used it, I had it in mind it stopped the blade stretching and took the pressure off the bearings...could be rubbish advice and not needed but my blades lasted for ages.
Just had a search, that looks to be a big mchine. I thought it was a small clone, that have mind of there own.
As Paul says, usually have a proximity sensor, and need to be uber tight. Unlike the toy I have, the blade type effects the amount of tension.