So, our Toyoda FV45 had been getting a bit louder lately to where it sounds like an almost grinding noise coming from the spindle gearbox. It finally got to the point where we had to stop using the machine for fear of completely destroying the machine. It has been taken apart multiple times since then (replaced all of the thrust bearings on the high/low gear change, and on the shaft that is directly under the motor). The spindle bearings were replaced a couple of years ago, and feel good, so we're assuming that that is not the problem. There seems to be too much play in between the gears, but we're not sure exactly how much is within tolerance. Below are two links to videos I took to try and show the noise that the machine is making. The quick changes in noise that you hear is when you adjust the spindle speed percentage up and down. Also, it makes a horrible grinding like noise when it first starts spinning. We've had the cover off and watched it start many times, and it is definitely not slipping. Not sure what the problem could be. Oh, and all of the bearings have been checked, and have the right amount of force on them to help with backlash. Thank you in advance for any help you can provide.
Toyoda FV45 CNC Mill Noise - YouTube
Toyoda FV45 CNC Mill Noise (2) - YouTube