Started a new job and they have a '96 VF6 here that is shooting the tools out of the spindle. A lot of other Haas' I've seen had the same problem but it could usually be explained by an incorrect retention knob or holder body.
This is a BT40 spindle with BT40 holders and retention knobs. I checked!
Any ideas? ;P
Yes, I clean the holders and the spindle lightly with green scotch brite daily.
Spindle air pressure in low gear @ 880 rpm is 21 psi.
It happens most often when I'm running high pressure cuts. Like I've been cutting A36 at a .015 lpt with a 2" facemill for a few days.
If you are referencing the spindle air/oil regulator behind the lube panel, it should be set at 17 PSI and should not be dependant on rpm.
Before the machine "shoots the tool out of the spindle", is there a pause just before? Do you get the impression that it is somewhat stuck but then releases suddenly?
Just trying to better understand the machine's behavior during the T/C process.
I was just trying to give an explanation of the operating conditions, wasn't sure if the pressure was different between high and low gear. Yes, I'm referring to the spindle air/oil regulator behind the main air regulator.
There isn't a discernible pause however it does feel as if it could be jammed a little bit. On haas machines I've run without this problem the tool just kind of falls out. Could the drawbar be malfunctioning?
Yes, it is very noticeable.
Sometimes this is a normal thing especially when you have heavy side loads, excessive vibration, or excessive heat. Does it release all tools like this or just a select few?
It's hard to tell if this is normal or not since I am not there to witness for myself. Usually my first suggestion is to clean both tapers, but you stated that you do this reguarly already.
It could just be a difference in machines. If you truly feel this is a problem, you may just want to have your local HFO take a look at it just to be certain.
This project is producing all three of those conditions but I worry about it because it is easy to tell this spindle has been crashed. I can hear bearing grinding a bit and 2.6hp cut produces a 35% spindle load. This machine has a 20hp vector drive that seems very peculiar. I poked my head up there then clamped and un-clamped the tool a few times but didn't see anything alarming. The four bearing that ride the retention knob look fine. A little wear where the top of the knob sits against the drawbar.
It may be that the counter air system, (I keep forgetting what it is called), that keeps the piston from slamming in the top of the release bar may be bad. This causes the piston to hit it hard and makes a big clanking noise. And therefore it would knock the tools out pretty hard.
I saw on a machine where I used to work.
Haas VF-2, HA5C, Hardinge CHNC 1, BobCAD V23
All good suggestions, I would also be concerned about the spindle heating up and sweating the tool in when it cools. You stated it had bearing noise, thats a good indicator. You can also dust the bore with graphite, if that helps its probably the taper itself sticking.
No, apparently it is only after a heavy milling operation.