Has anyone had much experience with these machines? I am programming for two of them and the spindles don't seem to last more than 12-18 months without needing to be rebuilt. We have had some minor crashes, but none have been very hard. No spindles have ever full rapid crashed into anything that I am aware of. One of them runs 14000 RPM virtually 24-7 however. Any information as to whether or not this is normal and ideas on how to make them last longer is appreciated.

Thanks,
Travis