Therefore, on average, you are going to be spending between $18 to $36 per hour on abrasive. Assuming 6 hours of cutting time per day, that's $110 to $220 of abrasive per day, or $550 - $1,100 per week, $2,200 to $4,400 per month, $26,000 to $55,000 per year. Now, to make these numbers useful, we need to take into account the differences in ...