Electronics Forum | Thu Sep 29 20:26:58 EDT 2005 | DasonC
Any aperture/stencil thickness suggestion to provide a rigid solder joint for 0.8mm pitch PBGA with 0.4mm ball diameter. The pad is based on IPC7095 and it is 0.3mm. Thank!
Electronics Forum | Mon Oct 03 10:20:43 EDT 2005 | davef
Follow your component supplier recommendations. For instance: Xilinx says their lead-free alloy for their BGA spheres is SnAgCu, and liquidous is 217*C and they want you to peak at 230 - 235*C for good wetting according to their reflow guidelines.
Electronics Forum | Mon Oct 03 12:32:06 EDT 2005 | russ
Flux is not classified as lead or lead free. You are cleaning flux not removing solder.
Electronics Forum | Mon Oct 03 14:22:23 EDT 2005 | davef
You'll still have to dispose of filters and whatnot and recycle your water polishing system tanks as hazardous materials.
Electronics Forum | Tue Oct 04 09:24:22 EDT 2005 | PWH
Thanks for this reply - we're up against all the things you mention...
Electronics Forum | Mon Oct 03 12:26:43 EDT 2005 | GS
Hello, I am looking for informations about water cut stencil process. Your experience,literatures,links,advices, etc,on this matter will be very appreciated. Thank You Regards............GS
Electronics Forum | Mon Oct 03 14:19:47 EDT 2005 | Roland
There may be some helpful information for you in this .pdf since it includes materials and cutting tolerances: http://www.orionind.com/Catalog%20Sheets/waterjet.pdf
Electronics Forum | Tue Oct 04 06:52:28 EDT 2005 | Rob
Am I doing my maths right? 0.005 inches is 0.127mm which is crap for a stencil. Our supplier (laser cut)has an aperture tolerance of 0.005mm (approx. 0.000197 inches).
Electronics Forum | Sun Oct 09 01:11:34 EDT 2005 | vev
There is a stencil cutting machine in the industry which utilizes a water jet to deliver a Laser beam for cutting stencils. There are no machines of this type in the states. The quality is no better than a Laser cut stencil using a good Laser System.
Electronics Forum | Wed Oct 05 11:45:30 EDT 2005 | chunks
Not knowing your company, I would treat LF boards as a new part number. All boards are sold in lots, so controlling both part numbers at the same time would be easy. May add to your inventory but beats mixing.
