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Stumbled on an old forum post from 2004 about rapids vs feed rates
Some guy was saying back then you had to baby your rapids at 50% or risk wrecking your spindle. I found it on cnczone digging through old threads last night. Anyone else remember running machines that slow or was that just the old Haas gear?
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fionarodriguez6d agoMost Upvoted
50% rapids on old Haas machines wasn't some paranoid myth, that gear was known for losing position if you pushed it too hard on long moves. I've seen guys snap endmills and trash parts just from running the feed too fast on a simple pocket, so slowing things down kept the machine predictable. If you think babying a machine is dumb, go ahead and max out your rapids on a older VF-2 and see how long the ballscrews last.
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abby83615h ago
Oh man, I gotta admit I used to think the whole "baby the Haas" thing was just people being overly cautious. But after watching a buddy wreck a near-finished part on an old VF-2 because he ran a long pocket at full rapid (like 600 IPM or something crazy), I totally get it now. The machine just lost position halfway through the cut and the tool dug in. So yeah, @fionarodriguez, you changed my mind on this one. I'd rather take a bit longer and know the machine won't surprise me mid job. Nothing worse than scrapping a part over a few seconds saved.
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campbell.nora5d ago
Did you ever run into that issue more on certain types of cuts or was it just random on long moves, @fionarodriguez? I'm curious if it was tied to the toolpath direction or just a straight up hardware limitation. I've heard old Haas machines could be real finicky but it sounds like it depended a lot on the specific model too.
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