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My spindle bearing went out mid-job yesterday
I was running a 3 inch endmill through some 4140 plate and the spindle started making this grinding noise. By the time I hit the e-stop, the bearing was already shot and I lost the whole part. This was a 6 hour setup for a rush order, now I'm scrambling to get a replacement bearing from a supplier up in Detroit. Has anyone here replaced a spindle bearing on a Haas VF-2 themselves, or should I just call the service guy?
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hugo_bennett1mo ago
Damn, that's brutal. Have you checked the spindle taper itself for any scoring or heat damage? If the bearing went that quick, there's a good chance it took the taper with it and you'd be chasing runout the whole time even if you swap the bearing.
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grant.sam1mo ago
...and that's exactly what happened to me on a Bridgeport last year. I thought I'd caught the bearing failure early, just a little rumble, so I swapped it out quick. But the taper had this faint blue ring from the heat and you couldn't see it unless you wiped it clean. Ended up chasing a .002 runout for three jobs before I finally pulled the whole cartridge and found the taper was cooked. A regrind fixed it but man, that was a costly lesson about looking before you leap. You check the drawbar threads too or just the taper?
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nina_johnson861mo ago
Oh man, that's rough. I had a buddy who tried swapping a bearing on his VF-2 himself thinking he'd save a few bucks. He got the new bearing in, buttoned it up, and the first cut was okay but by the second pass the whole thing was vibrating like crazy. Turns out he'd nicked the taper just a tiny bit when he was pulling the old bearing off, and it threw the runout off by like .003. He ended up having to call the service guy anyway and pay for a whole spindle cartridge rebuild.
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