disturbance focal point
disturbance focal point
(OP)
when I make the cut on a piece of sheet metal of 10mm! I observe that the focal point that varies in the four face part is ... it depends on what lens (lens I use 7.5 ')?
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RE: disturbance focal point
-HR
RE: disturbance focal point
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RE: disturbance focal point
RE: disturbance focal point
Try to cut something thinner, like 6mm (1/4). Your focal for that should be around 0.5mm above the plate. To cut 10mm, your focal should then be a little higher than that, for example 1mm above the plate surface.
RE: disturbance focal point
RE: disturbance focal point
RE: disturbance focal point
RE: disturbance focal point
RE: disturbance focal point
RE: disturbance focal point
Does that machine purge the beampath w air? We had a machine do something like this whenever they left the forklift running near their air compressor, the compressor sucked in the fumes and pumped it into the laser. in other words, make sure you have clean beam path air. Another customers machine stopped cutting when they used their paint booth, the air compressor was on top of the booth. Purge w N2
Chris Krug http://krugtech.com/
Maximum Up-time, Minimum BS
RE: disturbance focal point
Also. Post some pictures. It helps.
RE: disturbance focal point
RE: disturbance focal point
You could try to move your focus a little bit higher and see if that gets better. Or lower the gas pressure or power a little bit.
Not sure how much power you were using; but try to cut with less power, like 2500W (you may have to slow down the speed a bit). If it becomes more consistent at lower power, then it's probably an optic issue (maybe stressed output coupler?). How many hours do you have since last optics change?
RE: disturbance focal point
4000w 2000hz 100%duty 0.06Mpa 1.5mm gap at 70 inches per minute 1750mm / minute. Check the setting in the upper left of the control and make sure its on THICK. Make sure your beam purge or nitrogen purge is on and working.
Make sure your lens is clean top and bottom (for now, and the sake of argument, no spots at all). Make sure you have a good nozzle and it is centered properly.
Read the document I posted / attached.
Start out by adjusting the focus in the upper right of the cutting condition page. Line E1 if you have a 160i or the spot where it says focal if you have a NT.
Cut a hole and square, mark on it your focal position, move up 1mm, cut another one, mark it, move up another mm, ......
You should see a range where the cut gets worse and worse. If that is the case, stop when you get one that will not come out of the sheet. Ideally, you would see a complete range, from bad, to good to great to good to Turmph part.
Your focal point you want to cut with should be right in the middle of that range.
To be more specific, for example, you cut a part it will not come out of the blank at -6mm. You keep moving it up (-5mm -4mm -3mm -2mm....) until you get to -1mm part looks good. Keep going until you get a part that does not come out of the sheet. Go all the way. it may be at +4mm before you get one that does not come out of the sheet. (-6 mm + 4 mm)/2 = -1mm (pretty good, even for an engineering website). The point you want to cut with is in the middle of the range.
RE: disturbance focal point
RE: disturbance focal point
RE: disturbance focal point
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RE: disturbance focal point
RE: disturbance focal point
I worked on that doc (mainly to make it semi-usable) while I was at Amada.
It's kind of scary that nobody has reworked it since then!
regards
Jay
Jay Maechtlen
http://www.laserpubs.com/techcomm