Have seen this caused by bad beam alighnment(beam alignment should be checked every thouseand hours of operation), and lenses. Check the lense in the cutting head first. Although I'm a little fusy on the problem description and this particular machine, this sounds like something that may be adressed in the maintenace manual. Typically most companies have technical nelp lines available, and also may have a record of any services done to this particular machine, given a serial number. Let me know what you find.

Good Luck

Please give a little more info on what you mean by skewed and I may be able to help.

ekimbarl:

I would take the following steps:

a) Double check your CAD
b) Make sure your clamps are tight
c) Depending on the process (clean-cut, o2 cut, material type and thickness) use a slower cut condition according to diameter of the holes
d) Use 150 X Diameter as per your Operators manual
e) Last but not least contact your local Salesman or Service man to address this problem.

Mayron Sandoval
Laser Applications Engineer
Amada America
(714) 739-2111 X 5252
msandoval@amada.com

Hi,

Check your cutting speeds, if they are to fast the drives can over run slightly causing oval holes and wobbles at corners. Also check to see if the parts aren't moving in the sheet as they are being cut, as parts are cut from the sheet it will loose it's structure and can move as the bed moves.

regards
Dale

   Skewed holes can be caused by all of the things suggested, you need to look at the consistency of the bad shapes, if it is all over the sheet, and on various parts, and the flat spots are on different sides of the circles, then you need to look at the parts moving inside of the sheet or the clamps, something on the sheet, or the sheet itself is moving.  If the holes are consistently off on every part that you run, then check beam allignment and your ball screw backlash.