DIY BGA Optical Alignment System on ACHI IR 6000

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Re: DIY BGA Optical Alignment System on ACHI IR 6000

Postby Jane11 » Sat Aug 02, 2014 11:03 am

@surbo: I wanted to finish it with 25x25mm prisms and after that I can think about replacing it with 60x60mm.
It , however, seems to me there is a quite small space for using 60x60mm prisms.
But I still have a problem with exact alignment. On the screen I can see, BGA is aligned with PCB but in reallity quite different.
Does anyone know if there is any trick how to make a correct alignment setting?
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Re: DIY BGA Optical Alignment System on ACHI IR 6000

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Re: DIY BGA Optical Alignment System on ACHI IR 6000

Postby Jane11 » Mon Aug 04, 2014 7:38 pm

@reptooyep
For the tuning, you need to touch the horizontal alignment of this metal support because prisms cause difraction of the video beam (about 8°).
If you put the prisms perfectly horizontal, you will see the chip aligned on the pads but you will get about 5mm error !!
So, TUNING is very very very hard.

You right.Very difficult ( at least for me, so far I am not able to make a proper alignment.)
Do you have any advice? How did you make your perfect tuning?
And where did you find out that diffraction of the video beam is about 8° ?
Thanks
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Re: DIY BGA Optical Alignment System on ACHI IR 6000

Postby Simeon » Sun Mar 01, 2015 7:46 pm

hello every one, recently i purchased a BGA rework station with optical alignment but something is not right with the prism system. When align the chip it appear to be aligned only in the center area, the sides and the corners has a distortion and the dots are not one above another. Please advice,this the video witch show the actual problem https://www.youtube.com/watch?v=C-IGw2J ... e=youtu.be
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Re: DIY BGA Optical Alignment System on ACHI IR 6000

Postby Jane11 » Mon Mar 02, 2015 8:55 pm

What kind of the alignment system is used? Also a-two-prism principle? if, so would guess then prisms are not set properly
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Re: DIY BGA Optical Alignment System on ACHI IR 6000

Postby reptooyep » Thu Mar 19, 2015 10:00 pm

Hi,
I have the same trouble with my alignment system.
The center of the screen is aligned but not the corners. It comes from the prisms position. It mixes two images which do not have a square angle withe the prisms.
If you don't understand, i'll make a scheme.
On mine, the problem is not that bad because i use a 12mm lens instead of a 3 (with the 12mm lens, it makes a zoom on the usefull area).
Regards
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Re: DIY BGA Optical Alignment System on ACHI IR 6000

Postby Jane11 » Fri Mar 20, 2015 8:44 am

Do you mean that it is caused by not good made prisms?
Or can you make the scheme?
Thanks
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Re: DIY BGA Optical Alignment System on ACHI IR 6000

Postby reptooyep » Sat Mar 21, 2015 10:39 pm

Hi,
I mean that the two images are not right angled.
If the prisms or the lens are bad mounted, distortion may appear and will get bigger on the border than on the center.
Image
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