Auction lot surprise in Ohio changed my spindle speed habits

Picked up a used Haas at an estate auction near Toledo for $3,800, figured it was a steal. Got it home and the previous owner had ran every job at 4,000 RPM, no exceptions, and the spindle bearings sounded like a coffee grinder after 20 minutes. Turns out he was terrified of chatter from a bad holder and just never tried slowing down or adjusting feed. Now I keep a log card taped to every machine with the sweet spot speeds, and I check that before I even load a tool. Anyone else buy a bargain machine that came with hidden bad habits baked in?

1 comments

1 Comment

mary_schmidt11d ago

That "coffee grinder" sound after 20 minutes is a red flag he ignored for way too long. So my question is this: did the seller ever mention what kind of tool holders he used, or did you have to figure that out on your own? Because bad holders can wreck a spindle faster than any speed setting, and if he was running everything at 4k, I bet he never balanced a single assembly. You said you check the log card before loading tools, but how long did it take you to trust your own numbers over what the previous guy did? I had a cheap lathe once that came with a stuck taper, and it took me months to stop blaming the machine and start checking my own setup. Curious if the hidden bad habit was the holder or just his stubbornness.