Problem- Haas VF-1 '95 Shuttering

[Alex VF]

Hi everybody,

When I mill on my Haas VF-1 (model 1995) it shatters every time it changes from a G-code to another (for example from a G01 to a G02 code). I checked out the parameters but I could not find a solution. The VF-0 which we have (model 1995 but older that the VF-1) does not shatter at all and works very smooth.

This shattering occurs even at low speeds.

Does anybody know hot to solve this issue?

Thank you.

Alex

[KenFoulks]

Try adjusting these settings:

191=Finish
85= about .005

You can also try toggling your High Speed Machining (HSM) ON/OFF

[haastec]

Are you having finish issues or noise issues? Or both?

[Alex VF]

Hi guys,

Thank you for your efforts.

Ken; I looked for the 191 code but I did not find it. Where should I look for the HSM?

Haastec; I do not have finish issues but I would prefer that the machine would work more smooth. It also stops when it is milling a circle and it changes from quadrant (for example from +X to /-X).

Alex

[haastec]

You could have a loose ball screw which would cause the issues described. If you are comfortable doing this, pull back the left X-axis way covers. With the machine in E-stop, grab the ball screw and feel for excess play. Also, if it is loose, you will see the ball screw move before the table does. If this is the case, try tightening the ball screw nut located under the gold cover plate by the motor and see if this helps your situation.

Also, if you have been running this machine without issue and this problem just came up, I would highly doubt that it is a parameter issue.

Good luck.

[Alex VF]

Haastec,

Thank you for your reply. I will check it tomorrow and inform you. Do you know whether this might also be a setting on the machine that can be changed?

[KenFoulks]

Originally Posted by Alex VF Ken; I looked for the 191 code but I did not find it. Where should I look for the HSM?

For setting 191: Go to settings, type "191" and press down.

For HSM: Go to parameters, type "315" and press down six times.

[Alex VF]

Ken,

I checked the parameters but I do not have these parameters (291 and 315). Maybe you are referring to a newer model? Mine is a 1995 model.

[KenFoulks]

Setting 191 and parameter 315 were developed after 1995, but setting 85 should be there.

[Alex VF]

Ken, thank you. I checked it already and the current value is 0,500 (the same value as on the VF-0 which does not shutter), but I will change it tomorrow to see what happens. I will let you know.

[Alex VF]

Ken,

I changed the parameter 85 to 0,005 but unfortunately it did not work. thank you anyway for your help.

[Pondo]

If you look at the G code you are running, is there a G187 line in it?
Our programmers used to put that in the post after every tool change. It overrides the accuracy control (setting 85) to whatever the E value is.
If you go one page down from your normal current commands screen you can see all the active codes and values as the machine runs. The E value is on the far right and all the way down. If it is not the same as your setting 85 value (.005 or so for instance) then it is being overridden.
Also, are you running the program from the control or DNC?