Josh@OTTP
Plastic
- Joined
- Sep 5, 2018
- Location
- Dryden, Michigan
I have a 6 month old Haas ST-15 on the floor. Honestly it has a lot of problems, some have been fixed but this one is bad and I'm reaching my limit. Since new it has had a vibration. With nothing in the chuck at 4000 rpm it is slight, put a 1" 6061 bar in and it is very noticeable, put a 2" 303 bar in and at 2100 rpm the machine vibrates so bad it seems like it will start walking or maybe explode. Put a 2" 6061 bar in it and at 2900 rpm it starts to vibrate bad. All bar lengths are about 47-48" long. I have the spindle liner kit and these bars do not hang out of the liner. I am only at about half of the max bar weight per Haas bar feeder spec too.
So far the tech has done the following with no change.
Checked level.
Tightened the belts.
Cleaned the actuator and balanced/set runout. (it was packed full of Loctite and had .007" of runout)
Replaced the actuator and balanced/set runout.
Ordered a trusty cook spindle liner to see if the liners were causing it.
My question that Haas hasn't been able to answer is this. With a test indicator on a piece of stock hanging 5" out of the chuck, how much movement should I see on the stock and on the backside of the spindle in a push pull test? With very little force say 20lbs pushing on the stock I see about .003" of movement off of center.
So far the tech has done the following with no change.
Checked level.
Tightened the belts.
Cleaned the actuator and balanced/set runout. (it was packed full of Loctite and had .007" of runout)
Replaced the actuator and balanced/set runout.
Ordered a trusty cook spindle liner to see if the liners were causing it.
My question that Haas hasn't been able to answer is this. With a test indicator on a piece of stock hanging 5" out of the chuck, how much movement should I see on the stock and on the backside of the spindle in a push pull test? With very little force say 20lbs pushing on the stock I see about .003" of movement off of center.