I am getting different results when changing the feed rate on my machine. When the feed rate is slower the engraving looks a lot better. Anyone know what would cause this?

When you look at the picture of the two "e"s the first "e" was done at a higher speed and the second "e" was done at a slower speed. So my question is what the hell would cause this? We replaced the bearing blocks on the X axis do we need to replace them on the Y axis too?