Worn way or ball screw in X?

C

clayton

Aluminum

Joined

Aug 19, 2011

Location

Houston Texas

• May 22, 2018

• #1

I’ve been chasing a problem with the surface of parts from face mills having issues in the same spot in the travel in X. No matter what material, feed speed doc, tried 3 different aluminum specific tools and different batches of material.

My vise is positioned pretty far left on the table. And this area with the issue shown in the pic is 6.5” from max travel in -X to the spindle centerline. Again I’ve fed from both directions across part. Same affect. Vise is tight. Squaring stock, or cutting extrusion as is made no difference. Parallels are firmly seated, not loose.

Has anyone had an issue like this?

Machine is a 2009 VF2

 

P

pressbrake1

Stainless

Joined

Dec 8, 2012

Location

essex england

• May 22, 2018

• #2

Is the machine levelled properly with equalforce on all levelling bolts.

 

C

clayton

Aluminum

Joined

Aug 19, 2011

Location

Houston Texas

• May 22, 2018

• #3

pressbrake1 said:

Is the machine levelled properly with equalforce on all levelling bolts.

Click to expand...

Yes, Haas tech came and double checked everything.

 

DavidScott

Diamond

Joined

Jul 11, 2012

Location

Washington

• May 22, 2018

• #4

If it wasn't in the same spot of the axis travel I would guess it is the beginning of losing your spindle preload.

 

M

magno_grail

Hot Rolled

Joined

May 29, 2014

Location

ca, US

• May 23, 2018

• #5

If the stock is slid right in the vice, does the chatter remain in the same place?

 

C

clayton

Aluminum

Joined

Aug 19, 2011

Location

Houston Texas

• May 23, 2018

• #6

magno_grail said:

If the stock is slid right in the vice, does the chatter remain in the same place?

Click to expand...

Yes, it’s in relation to the table. I moved my vise and it cleaned up.

 

C

clayton

Aluminum

Joined

Aug 19, 2011

Location

Houston Texas

• May 23, 2018

• #7

After further investigation and testing I got good results but seem to have identified the problem. I pulled the way covers and it doesn’t look good. Seems not to be getting any lube. And there are bearings laying there...

 

H

haastec

Hot Rolled

Joined

Mar 8, 2010

Location

Southwest, USA

• May 23, 2018

• #8

Are the bearings from the ball screw or one of the linear guide trucks? Either way it looks as if you got a bit of work ahead of you. Once you get the bad part replaced, be sure to flush the entire lube system. Most likely the metering units have become clogged. Sludge can form in the bottom of the way lube tank and can contaminate the system.

Good luck on the repairs.

 

M

Milland

Diamond

Joined

Jul 6, 2006

Location

Hillsboro, New Hampshire

• May 23, 2018

• #9

With it being consistent in location, I'd think it's a section of the ballscrew thread that's damaged, leading to the bad finish. If it was the trucks that lost contact in the middle, you'd still have the two outer sets controlling the table, while the ballscrew nut is short enough that if it hits a bad section of the screw there's nothing else in contact.

Sucks that you've got so much damage with such a "young" machine.

 

P

pressbrake1

Stainless

Joined

Dec 8, 2012

Location

essex england

• May 23, 2018

• #10

So the haas tech checked everything but didnt pull back covers.
No offence to you but I thought it was a mystery problem not obvious mechanical failure. Id contact HAAS for a refund on the callout costs