Debate: Coolant through the spindle vs external flood coolant on a Haas VF-2

Ngl, I've been going back and forth on this for a solid 6 months on my 2018 VF-2. I tried through-spindle coolant for a job drilling 304 stainless with a 3/8 carbide drill, and it pushed chips out great but made a mess of the whole enclosure. External flood was cleaner but I had to baby the peck cycle and the tool life dropped by about 40%. Which do you guys lean on for production work, and have you seen any real difference in insert life?

2 comments

2 Comments

theagibson4h ago

40% tool life drop with flood? That's wild man, I've never seen that big of a hit just from switching coolant methods. On my 2017 VF-2SS I ran that exact same 3/8 carbide drill in 304 for a job last year and TSC gave me about 15-20% better life at most, not 40%. Something else has to be going on there, like maybe your flood nozzle angle is off or your coolant concentration is too low. Chips not clearing properly can seriously mess with tool life even if you're pecking. Plus TSC tends to wash out the coating on drills faster if you're running high pressure over 1000 psi.

craig.mila3h ago

Has anyone else noticed that TSC at higher pressures sometimes makes things worse before it gets better? @theagibson, you're totally right about the coating thing, I've seen that exact issue with AlTiN coated drills over 1000 psi where the coolant blasts the coating right off the cutting edge in like 50 parts. Plus another thing nobody talks about is how TSC can actually work against you in gummy materials if the pressure pushes chips back into the cut instead of clearing them out. I had a job in 17-4 PH where switching from 800 psi to 1500 psi actually cut my tool life by half because the chips were getting packed so tight in the flutes they couldn't escape. So 40% sounds crazy but honestly if your flood setup is dialed in perfectly and your TSC is borderline too high, that gap makes total sense.