Mine just failed, too, and I am very concerned.
My wife and I have owned a small CNC shop for 33 years and this is my first spindle failure.
You know how some guys approach retirement and splurge on that dream car, or boat or whatever? Well, I've always dreamed of owning a Matsuura. 6 years ago I picked up some work that involves some complex contouring - it needs someone to who pays attention and repeats on a fairly regular basis; good work for me as I approach retirement. An opportunity came up to buy a new Matsuura H.Plus-300 and I begged my wife for it like a boy begs for a puppy, I promised to take care of it and that we could make money off it for a very, very long time.
I bought all new tools and babied her; I even named her "Babe" (she's big and blue). The job runs for 3-4 weeks and then is usually off for a week or two. One shift. Most of the work is done with endmills running 3,000-6,000 rpm. There is a deburring operation that runs at 8,000rpm with a small chamfer tool. The 3" face mill just skins the face and a 2" HF mill is the rougher. The machine has been under power for only 3800 hours with 988 hours of cut time. I am the only one who has ever run it, and it has never been crashed. I point her out with pride saying ". . . and there's my baby".
Last year, I was sent an email from Yamazen that I needed to run a daily warmup program, bringing her up to 15,000rpm every morning. I did it of course - anything to take care of my baby. Not too much longer, she started to whine at high speed. I didn't notice at first, since the change was gradual, but my son pointed it out. Under the assumption that once a spindle fails, there is nothing to do but replace the spindle, I kept her under 8,000 rpm and got a few months ahead on my parts.
The machine had coolant through prep when I bought it but I didn't have the pump added until 2019; I replaced the rotary union in hopes that it was squealing from sitting for several years without coolant running through and that's where the noise came from. It didn't make a difference and when I ran the the warmup program the spindle bearings failed.
A new spindle (including core exchange) is $30,000, which has resulted in poor sleep over worrying about what I could have done differently.
I have more than a dozen CNC machines here. I bought my first HMC in 2003, it was a beat up repo MHI H4b. That machine has run every day for 19 years - I've had the spindle reground in place TWICE from crashes so bad that the pull studs broke, yet it keeps turning. My 16 year old 50 taper HMC runs all day, ramping that heavy tool up to 12,000rpm. We bought our first VMC in 1989 and it runs all day every day, who knows how many crashes it's been through?
Is there any hope that Matsuura with do something about this? I knew they were aware of potential problem when they implemented a new protocol on a 5 year old machine and this post confirms my suspicion. I know the machine is well past warranty and has been working on a shop floor for 5 years, so there's no point in hiring a lawyer or anything, but I also know that that high quality engineered products don't fail without a reason, and since I didn't do anything it must have been a design or construction flaw. The question is: will Matsuura acknowledge that? What was the resolution to the OPs situation? Obviously I must order the spindle and pay to have it fixed since I have to start making parts again soon.