Tried turning up my feed rate on aluminum and it actually cut smoother

I've been running a Haas VF-2 for about 2 years now and always babied the feed rate on aluminum parts. Last week I had a rush job for 50 brackets and decided to bump it from 30 ipm to 50 ipm just to see what would happen. To my surprise the surface finish came out way better and I saved almost 3 hours total run time. No chatter, no tool breakage, just cleaner cuts. Has anyone else had luck pushing their feeds way past what feels safe?

3 comments

3 Comments

viola_garcia562d ago

That 30 to 50 ipm jump is a pretty big gamble on a VF-2. Honestly, I've been running a similar machine for a while and I learned the hard way that pushing feed rates too fast can wreck your spindle bearings over time. Aluminum machines beautifully but the vibration from a higher feed, even if it feels smooth, puts a ton of extra stress on the head. I've seen guys chase that smoother surface finish and end up with a $3,000 spindle repair bill a few months later. The finish might look great now but you're trading long term reliability for a short term gain. I'd rather run at a proven 40 ipm with a slightly duller tool than risk that kind of damage.

mason.drew2d ago

Been running a similar machine" sounds exactly right. I pushed a VF-2 to 55 ipm on a roughing pass in 6061 once, felt like it was cutting butter but after about six months I started hearing a weird noise from the head. Had to pull the spindle and the bearings were shot, $2,800 repair total. The smooth finish was great while it lasted but looking back I wish I'd stuck with 40 ipm like @viola_garcia56 said. That extra 10 ipm just isn't worth the risk when you've got a machine you're relying on every day.

sandragrant1d ago

Yeah but that 55 ipm was probably pushing it even more than you think.