Haas Arc Move Problems

[Rocketmachinist]

I have a 2007 Haas VF4SS and I'm having a problem with the arc moves on the machine. The tool in a roughing cut will start to squeal going from Y neg to X neg and from a y pos to x pos arc moves. I've had our local repair guys come out and they said it was a bad tool holder and that seemed to fix my problem for a while. Now I'm trying to rough with a 1.25" 3 flute, Sandvik inserted cutter on a Capto holder and still getting the same squealing. I cannot figure it out. I'm only taking a 1" depth of cut and a 10% step over on dynamic core mill and 2500 rpm and .005 fpt. I'm starting to think this particular machine cannot take that heavy of cut and I should try the same tool path on the new machine I'm getting and see if that makes any difference.

[CADCAM3D5AXIS]

A New machine to replace or add to the mix?? anything Good as IN Heavy Duty ?

[Rocketmachinist]

add to the mix. It's going to be a Haas (I Know) VM3. Hopefully it should be a little more rigid than the SS series.

[CADCAM3D5AXIS]

are you making the new skins for Hanger 1 ???

[CADCAM3D5AXIS]

anything new is a Good thing so let er rip !

[Rocketmachinist]

No with all the budget cut backs. Right now it looks like Hanger 1 will sit there until it rust out and collapses.

[Aeroguy]

This is just my 2 cents worth, so take it as you please, but I think what your problem could be is your being too hard on the machine. I am pretty sure the VF4 series only has a CT40 taper on it, so trying to hog out a 1" deep cut with a 1.25" cutter is too much for the spindle to handle. You really need a 50 taper machine for something like that, or use a smaller tool and lighter depth of cut.

Of course, if it is a 50 taper, then something else is wrong.

 

I have a 2007 Haas VF4SS and I'm having a problem with the arc moves on the machine. The tool in a roughing cut will start to squeal going from Y neg to X neg and from a y pos to x pos arc moves. I've had our local repair guys come out and they said it was a bad tool holder and that seemed to fix my problem for a while. Now I'm trying to rough with a 1.25" 3 flute, Sandvik inserted cutter on a Capto holder and still getting the same squealing. I cannot figure it out. I'm only taking a 1" depth of cut and a 10% step over on dynamic core mill and 2500 rpm and .005 fpt. I'm starting to think this particular machine cannot take that heavy of cut and I should try the same tool path on the new machine I'm getting and see if that makes any difference.

[BenK]

Aeroguy, with only a 10% radial step over it should take it just fine.

 

Have you checked the draw bar pressure?

[Rocketmachinist]

Have you checked the draw bar pressure?

 

That is probably the one thing we haven't checked. I had the same problem before on some programs that I ran. I took it over to another shop that has a late 90's vf4. Ran the same part with the same holder, with the same jaws and it sounded fine.

[bet338]

I have a 2007 Haas VF4SS and I'm having a problem with the arc moves on the machine. The tool in a roughing cut will start to squeal going from Y neg to X neg and from a y pos to x pos arc moves. I've had our local repair guys come out and they said it was a bad tool holder and that seemed to fix my problem for a while. Now I'm trying to rough with a 1.25" 3 flute, Sandvik inserted cutter on a Capto holder and still getting the same squealing. I cannot figure it out. I'm only taking a 1" depth of cut and a 10% step over on dynamic core mill and 2500 rpm and .005 fpt. I'm starting to think this particular machine cannot take that heavy of cut and I should try the same tool path on the new machine I'm getting and see if that makes any difference.

 

Maybe you should have your spindle taper checked. We have a 10 year old Kitamura 4x ,( CT 40 ), that has repeat heavy cut jobs on it and we noticed a difference in tool cutting sound and bad surface finishes. After speaking to the operators we found out there had been some unreported crashes. Turned out the spindle taper had been damaged. Had a company come in and grind it back true. Finishes are back and it sounds good. Had them check all of our Haas's, 3 of 9 needed ground. Made a difference. Might be worth a check as you said, "local repair guys come out and they said it was a bad tool holder" .

HTH