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Spent a full shift chasing a tenths runout on a 2008 Haas VF-2
It was a simple facing job on some 4140, but the finish was off. Checked the tool holder, the collet, even trammed the spindle again. Turned out the drawbar force had crept down to about 800 psi over the years and it was letting the tool pull in just enough. Took me from 7 AM to almost 3 PM to figure it out. Anyone else had a spindle issue hide in plain sight like that?
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olivia_morgan824d ago
People forget air lines can have the same problem. A tiny leak or a clogged filter regulator will slowly bleed off pressure over time, making the gauge read fine at rest but drop under actual use. It's not just the drawbar itself, it's the whole air supply system feeding it. A quick check with the spindle cycling might show a dip the static test misses.
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thea14324d ago
Gotta say, that's the first place I check on an older Haas. Seems obvious after the fact, right?
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