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Juki Laser Alignment

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#68918

Juki Laser Alignment | 14 May, 2013

We are having numerous issues placing BGA and IC's on a Juki 750 using laser, the machine has been recently calibrated but we are getting twist and misplacement quite often, any ideas?

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#68924

Juki Laser Alignment | 14 May, 2013

Hi,

BGAs should be placed by camera recognition if you have one(that helps to eliminate defects as missing balls...). If you don't, check the parameter for the laser level(height). In your case I think you should use the body as a measure level. If you measure where the balls are you may get these misplacements you mentioned in your post. Good luck!

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#68930

Juki Laser Alignment | 14 May, 2013

Thanks Evtimov. We have a 750 with no camera so unfortunately have to use laser. Also is there ever a need to manually alter the laser height for a component ?

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#68932

Juki Laser Alignment | 14 May, 2013

Hi again,

yes you have to pick the laser level sometimes. The machine will put some default level based on the component dimensions, which sometimes will be wrong for your part. Unfortunately it has been awhile since I worked with Juki so I can't tell you where exactly you should change the parameter. See the attachment for more details.

Attachments:

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#68933

Juki Laser Alignment | 14 May, 2013

Cheers again. So if the bga is 1mm thick and with the balls 1.3 mm thick I should set the component height at 0.9 to be sure of cotrectly centering on the body ?

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#68947

Juki Laser Alignment | 15 May, 2013

Also make sure nozzle retraction is ok, if nozzle shafts stick at different heights can effect laser centering stability.

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#68949

Juki Laser Alignment | 15 May, 2013

Absolutely! I would say go even 0.5 to be safe.

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