I went with friend of mine to look at a VCM 20 he was wanting to buy.For the price it seemed ok. The man selling it said at 100% rapid the x axis made a noise. So we did a g0 and it made a noise almost like a wiperbalde on a dry windsheild. (At least that is the sound I would think nearest to it that everyone would understand.)It ran well and made no noise at 50% rapid. I programed a couple of little things and it kept a good tolerance. It is not going to a shop but he does not want to buy trouble.
What do you think could be cause of noise?