Amada 2415 4NT AIV

[kthomsen]

I need others knowhow regarding the use of a AIV system.
For this machine came a operator manual explaining the use of and how to program the AIV measurement in laser nc programs.
It works just fine but sometimes some of the parts gets busted due wrong AIV measurements.
We use AIV on punched sheets, which has to be lasercut afterwards.
Every part are measured with AIV to correct for diversity along the sheet in X and Y plus angular diversity.

The measureholes must be within 2 to 10milimeters and be as far apart diagonal as possible in the part.

What should I pay attention to when using AIV method to avoid wrong measurements ?
I have the size of and positions of measure holes in place.
I know that the circularity of measure holes is important.
I always calibrate the AIV before running a AIV program.
But sometimes I get wrong parts in same sheet.
As far as 5/10 of a mm out of measure.
To avoid this I use check correction funktion for each part It works, but it would be much better to know why.

Sometimes the chosen measure holes are near other holes and for that reason will be in the AIV search field and I beleave that explains why I get faulty parts.
There´s nothing in the manual telling about this, that you must avoid other holes in the search area/field.

 

[LASERNINJA]

First of all, That's a great machine. The Optical sensor (OVS) works pretty well from my limited experience. There are very few machines out there that have this feature. Finding help must be very difficult and frustrating.

I would like to understand what your going through a little better before I jump to any conclusions. From what I remember, you can either scan the whole sheet, or each part, then laser cut it. As I recall the scan of each part takes a very long time but is more accurate. Is that what you have found?

One idea I would like to mention, There is a card in that has been added to the controller to give the machine this function. The card has an output for a television. It would be interesting to see what the camera sees and then try to figure out why there are such significant errors in the measurements.

 

[kthomsen]

Thanks for reply !
I scan each part because the sheet comes from a punching machine.
It´s more accurate.

There´s a tiny 5" lcd screen showing what the OVS see.
The OVS focus is manually adjusted on the camera.
There´s no moving parts in the camera, but some times the picture gets grumsy.
Maybee there´s an electronical or software failure on the OVS board.
I have to insert a check correction nc code to make sure that the OVS calculation is correct.

When a faulty scan happends this code stops further cutting.
The OVS scans are very unstable and unreliable - BUT WHY ?

I had two Amada engineers to look at it but they found no errors.
They did´nt check the camera, board or software .
They´ve done som test to check that the OVS worked proberly.
And it did - There was no errors at all.

Every thing are done by the book.
But something must be wrong - because the picture on lcd screen can only be either grumsy or sharp.
Not both - and for me that indicates some sort of electronical problem.
It´s a digital controlled camera and I think that the image sharpness/ brightness regulator may be the reason.
That could explain the thing with the image on lcd screen.

 

[LASERNINJA]

I not being sarcastic, but I don't know what Grumsy is. I gather from the context that it means less than Ideal but, would you say blurry and/or distorted?

It's nice they gave you the LCD screen. The other machines didn't have that.

The truth of the matter, I think your beyond me. I understand what you are saying but I don't know the cause.

If I were you, I would double check the camera lens area, I think there is a door that opens when the camera is active. Make sure it operates freely and there is no dirt on the inside. Also, the older OVS had a ring of red LEDs, are they functioning properly when commanded?

I sent an e-mail to an old friend. He is the true Laser Ninja. I haven't talked to him in a long time but If I hear anything I'll pass it along.

I know you want your OVS to work properly. I'm sure you spent a lot of money on it. But what your doing is rather common and there are other ways to do it if we can't get your OVS to work. Edge detect works very well. Usually it can get to +/-0.005". And I have another not so glamorous trick if necessary.

Good luck, and I post if I hear anything.

 

[LASERNINJA]

Sorry about the delayed response. I've been very busy running around the country side. I did receive an e-mail from the individual I had mentioned. He has some interesting ideas. His message is as follows:


It is very tough to say what is going on with OVS but If the customer have any evidence of electrical malfunction with OVS he should take picture or video it and present to Amada technician. In most of accuracy problem .

To check stability of OVS measurement result, open the correction result page in AIV under cutting condition laser parameter then perform only OVS program without cutting 100 times and see the differences of the result data.



I recommend use 4-5 mm diameter hole to maintain part accuracy because the area close to the edge of camera frame is unstable.





Most of case, there is something wrong with material of punch hole or cutting program.



Thanks. (end)

In my opinion, this gentleman is greatly responsible for making Amada lasers competitive with the rest of the field.
My thanks to him for the contribution.