Cutting trouble 1

[affa289]

Hey guys only new really to laser cutting every thing has been going ok but today when cutting some 8mm plate I had this happening I don't know is it cut speed focus power hahahah has me a bit stumped


Thanks for any help

Matt

 

[AndreCarneiro]

Hello Matt,

With that image it seems a problem with unstable cutting (sometimes cuts clean other times just doesnt). This can happen because of your protective window or because of the laser centering. Did you check those?

Hope it helped.

"Nothing is true, everything is permitted."

 

[affa289]

Thanks for the response ok will check centering next time and also what do you mean by protective window???

Thanks Matt

 

[krugtech]

have you been able to cut this in the past?

Chris Krug

http://krugtech.com/

Maximum Up-time, Minimum BS

 

[AndreCarneiro]

Hello again,

In my case (PRECITEC HEAD FIBER LASER) I have a protective window above 200mm of the nozzle, and sometimes, it gets points of "dirt" and it makes the cut unstable or it makes impossible to cut.

If it is possible I clean it, if not, I have to replace it for a new one.

Hope it helped,

"Nothing is true, everything is permitted."

 

[affa289]

Hi Chris

Yes I have been cutting along of 8mm and only a couple of times I have had this happen
But I just don't know why
Thanks Matt

 

[krugtech]

If you're using known good parameters then I'd look at anything that could affect beam quality. Everything the beam bounces off or goes through is suspect, including the lens, protection window if you have one and the quality of the air in the beam delivery conduits. I had a customer whose machine cut like this if someone left the forklift running near their air compressor, the fumes, while transparent to us, were like black smoke to the wavelength the laser outputs. could also be too much oxygen

Chris Krug

http://krugtech.com/

Maximum Up-time, Minimum BS

 

[FabproHelp]

affa289 - We had a similar problem with our laser less than a month ago. If you have a way to stress test your lens it may give you a surprising result. Our lenses looked almost perfect but had huge stress points running through them. It seems as though your lens is absorbing a lot of your power.

Does this happen after a certain amount of cutting time? Or is it completely random?

What laser are you using?

 

[analogkid2digitalman]

A sheet of polarizing film or glasses and an LCD monitor with a white screen (MS paint or blank Word Document) make for a cheap way to image stressed areas.
Look through the film with the lens in front of the monitor, stress will show up as rainbow colors.
You may have to rotate the film or your head for the best effect.

-AK2DM



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"It's the questions that drive us"
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[Lazer Lozer]

I have a F1-3015-NT & CANNOT GET IT TO CUT 1/2" worth a crap. New lens a month ago and I see spotting on it. Very new to this game. Been cutting thinner gauges fine although yesterday I started having trouble with 1/4". Same issue. Has me wondering what the problem is, as it seems to be getting worse. Any help is appreciated.
Amada sure is proud of their service. I'll leave it at that.

 

[krugtech]

low pressure O2 cutting problems are mostly beam quality issues.

Chris Krug

http://krugtech.com/

Maximum Up-time, Minimum BS

 

[Lazer Lozer]

krugtech,
Would this be an issue for a service tech to address? Also, what size nozzle would you recommend for 1/2" HRS? A good set of cut conditions would be greatly appreciated.

 

[affa289]

Thanks Chris will have to look into it some more and fab pro we are using a Amada lcg3015 Co2 it's been good so far only thing that let's it down is me I think in saying that was cutting some 20mm witch is at its maximum was cutting ok but did have a spot that went a bit mad on all the plates thanks Matt

 

[Lazer Lozer]

Ok, so the Amada tech came and the beam was way out of alignment. Lined it up.He tried to test cuts unsuccessfully of course and bailed. This morning I actually did cut a few pieces of 1/2" today. Got those couple through & now it's back to crap.