Problem cutting 8mm stainless

[sjclaser]

Hi all, some advice please!! Thank you in advance!

A few weeks ago i cut 8mm stainless on our 2.2 kw bystronic, using default settings, and had a brilliant cut - no burrs or anything! I am now trying to cut some again and the cut edge is still brilliant but there are massive (approx 3-5mm long) jagged burs coming of the bottom edge! I have tried everything to remove them with no luck, e.g. cleaned the lens, checked alignment, altered the cut speed, gas, focal point, etc. If anyone can help it would be much appreciated.

I put a sheet of 5mm stainless, and 6mm stainless in and that cut perfectly too (no burrs), but its not cutting the 8mm! Also, the 8mm is the same sheet which i previously cut very well, so it can't be the material!!

Thanks all,
sjclaser.

 

[sjclaser]

I thought i should say what the std settings are.... focal point 8mm, speed 550mm per min, gas 18.5bar, nozzle hk25 2.5mm.

 

[Thebeam]

Gas quality or the optics. 8mm are on the limit with that power.

The beam

 

[Tasa75]

If you can easily remove these by punching from a side,use the same settings and put a bigger nozzle (hk30). Can you share your .PAR file for 8mm stainless steel?

 

[HenryRollins]

CHeck the N2 side of your service unit to ensure you are getting 18.5 bar of pressure. Next, is your burr a directional burr, meaning the burr is constantly to one side no matter how the part is rotated in the nest? IF you experience this you may have an issue with mirror alingment or nozzle centering. Check the burn at all 4 corners. Center the nozzle with your largest nozzle available witht he head close to the cutting grates but not directly over a cutting grate, use 2 pieces of scotch tape to ensure a clean round hole shot/beam shot. Ensure that your cutting head lens is clean and installed correctly.
-HR

 

[krugtech]

check your lens w a polarizer too

Chris Krug

http://krugtech.com/

Maximum Up-time, Minimum BS