Hello, I am in charge of the daily use of our Bystronic 3015 and seeking help with cutting aluminum. Our stock for the laser consists of .080" (2.5mm) , .125" (3mm), and .250" (6mm) 5052 alloy - 4'x10' and 5'x10'. Please refer to the lower part of this post for machine specs. Currently, we are receiving a hard, "sawblade" burr on all cut edges of .125" and .250". The .080" leaves a smaller burr is the same density. Both burrs are hard enough to shred our strongest 80 grit that we use for debur. The plume is usually tilted slightly away from the the feed direction with white and yellow "sparks". We don't typically get a plasma burn on the top of the material, but it does still happen at points where an axis change will happen on top of a grate. In the past, .250" has always produced a worse result, but we have been succesful in reducing the burr to the same as what we get on .125". The .080" tends to cut clean, only leaving a finger-rocking burr if any. We use Nitrogen for all of our aluminum work and Oxygen for steel. .250" aluminum requires Oxygen as an assist gas. Tape shot reveals that we have an oval shaped or "cat's eye" beam path. Main operator claims that this causes a lot of our trouble. I have not found enough information to back up that claim. Our ultimate goal is to minimize impact on our Spray Prep department with post-laser prep. I'm personally trying to set a tolerance of less than 1mm for acceptable burr. Here are our parameters: .080 Head: 5" Focal Point: 1mm Nozzle Diameter: 1.5mm Nozzle Type: HK15 Power: 4K, 70% piercing, 40% Cutting Feed: 7500 mm/min Gas Pressure: 3 bar piercing, 8 bar cutting .125" Head: 7.5" Focal Point: 3.5" Nozzle Diameter: 1.75" Nozzle Type: Hk17 Power: 4k, 80% piercing, 75% cutting Feed: 3150 mm/min Gas Pressure: 2 bar piercing, 9 bar cutting .250" Head: 7.5" Focal Point: 6.9" Nozzle Diameter: 2.5mm Nozzle Type: HK25 Power: 4k, 80% piercing, 90% cutting Machine Specs: Resonator: BTL 4000 (DOB 2001) - 4200w - 20 mm beam Chiller: Koolant Kooler - 13HP Compressor - 5HP Pump Filter: Torit Filter System (Barrel) Air Supply: Shop Air on isolated line set - 120 gal - 175 max pressure - 1100 rpm - 15 hp motor Any suggestions are welcome and I will try to respond as quickly as possible. I can provide pictures of the cut quality, if interested. Thanks for your time.