Parameter Changing 1

[TheLaserburns]

Hello all,


I have been running a Bystronic Bystar 3015 for a couple of years now and it has been a great machine, however. Since we have had the machine every now and again the cut quality will just go right out the window. I could be cutting a 4 sheet nest, I can have cut 2 sheets then after transfering the third sheet hit start and the parts will be stuck together like the focal length is wrong or it will plasma the top of the sheet. To rectify this problem I have had to do some major changes of parameters to get back to a quality cut. This could entail changing laser power, gas cutting pressure, focal and feed rate, or sometimes all 4. Then after a day or to it will just go south again still using the same params that were working fine. I would change the params back to what they were originally and it's back to normall for a month or 2. This could also just happen halfway through cutting a sheet as well not neccesarily after starting a new sheet. It has everyone here scratching there head when it happens. Service Tech puts it down to beam alignment but I can't see that being the problem as it can change back to old params.

To give you an idea of the changes I sometimes have to make

Normal params for 3mm SS After issue depending on how bad it is
LASER POWER 3600 Between 3000 - 4200
FEED RATE 4400 Between 3900 - 4800
GAS PRESSURE 12 Always up never down 15bar
FOCAL LENGTH 3.8 Between 2.9 - 6

It's so random

Anyone experienced anything like this before ???.
It's not a major issue if I catch it early and I have enough knowledge to fix this issue when it arises quite fast, but if I can stop it from happening in the first place that is more ideal.

Specs
Bystronic Bystar 3015
Year of Manufactor 2005
The machine orginally came from Germany and now is in Perth Western Australia. I'm wondering if that has something to do with it. I remember one Tech who came to service it said it was missing something or had something on it that was unusual until I told him it came from Germany. That will be why he said because of the extreme cold during there winter.

Cheers in advance for any advice.

Chris

 

[FabproHelp]

LaserSpyder

what "GAS REGULATOR" are you talking about?

 

[LaserSpyder]

Fabprohelp the "NC programmable assist gas regulator" p/n 71359715 NC regulator .........

 

[URAX]

Looking at those pictures I think you loosing power somewhere. I had similar problem on my Trumpf. It could be lens, it could be RF Tube or driver stage.

 

[TheLaserburns]

Thanks guys for all the helpful advice. Thats why I read these forums.

Anyway Problem solved. Seems my ARC mirror decided to increase the beam diameter to twice it's factory recomended size, 40mm instead of 20mm.
So now it's smooth cutting from here on in.
Thanks again guys

If you ask me to do something, I will do it. There's no need to nag me every 6 months

 

[Maito_Cosmos]

How did you find out this problem?

 

[TheLaserburns]

@ Maito We had our bi-annual service done last week. Just found it while doing a full power test shot into a plaster target. As I said it's normally suppose to be 20mm and it was bigger then the plaster target. Wouldn't ever have been anything I would have checked. Plus even if I had removed it to check it, it didn't show any sign that it was damaged, all looked clean and not spotted.

I can now cut using Bystronic default settings with only minor tweaks rather than major changes.

If you ask me to do something, I will do it. There's no need to nag me every 6 months

 

[Maito_Cosmos]

I was thinking about doing shot on plastic cube, but I don't know how to do it. Could you please explain it to me. Is it pulse shot on 100% power? How many milliseconds? Where do I place the cube?

 

[LaserSpyder]

Maito_Cosmos start a new thread on mode shot