Electronics Forum: stencil (Page 404 of 540)

Recommendations for ultrasonic cleaning solution

Electronics Forum | Sun Jul 15 17:48:51 EDT 2001 | kerryn

You should check the archives, there has been much written on this subject in the past. Asking about the correct chemistry is wise. It never ceases to amaze me how many people think ultrasonics will work without the proper chemistry. Without the rig

Epoxy inspection

Electronics Forum | Fri Jul 27 13:16:03 EDT 2001 | cjrjmj

I am looking at the Pump application for several bottom side applications we have. They are heavy in through hole radial and dip content. The initial testing of the stencil was very good, but I am concerned with inspection of the glue. We do a sampli

Printing problem, water soluble paste with gold plating PCB..

Electronics Forum | Sun Jul 29 23:58:08 EDT 2001 | Frank

Hi Dave Thanks for your information. The problem that I found is paste not stick well on pads ( solder paste printing process). When the table move down (PCB saperate from stencil) some of paste stick on aperture instead pads. Solder paste : Delta

Printing problem, water soluble paste with gold plating PCB..

Electronics Forum | Tue Jul 31 00:48:55 EDT 2001 | Frank

Sorry I forgot to provide enough information. Stencil thickness is 6 mil Aperture width is 10 mil Aspect ratio (aperture area / wall area) = 0.72 Solder paste mesh size, type 3 (-325 +500) With this aspect ratio we can printing without any probl

Mid Chip Solder Balls

Electronics Forum | Fri Jan 14 16:21:42 EST 2000 | Dave Chapman

We are having mid chip solder balls on chips and resistors. Seeing the problem on 80% of the assemblies we run. Anywhere from 1 to six of the balls per board. We have slowed the oven down, increased the pressure on the screenprinter to get less paste

Re: Mid Chip Solder Balls

Electronics Forum | Fri Jan 14 17:51:37 EST 2000 | Dave F

Dave: Two more things: 1. Let's go backwards, so what changed that suddenly you've realized that "piles of stencils" are causing solder ballig on chips? Are we speeding down the wrong road? Or is this something you lived with and now have decid

Re: Frameless Stencils

Electronics Forum | Fri Jan 14 10:11:45 EST 2000 | John Thorup

I'll have to go along with Wolfgang as having a good experiance with frameless. We have been using a system from IIT in California for about a year. I was sceptical at first because of this system's X only tensioning but it does work. We use mostl

Re: smt on flexible board

Electronics Forum | Mon Dec 20 07:09:03 EST 1999 | Christopher Lampron

Ron, The simplest way to process fexible PCB's that I have found is to use a process carrier fixture. There are companies that manufacture process carriers that are capable of holding flex through stencil, placement and reflow. The carriers are capab

Re: Buying stenciling and pick and place equipement.

Electronics Forum | Mon Dec 20 17:30:30 EST 1999 | g cronin

bill is right about finding a reputable dealer, i do have a horror story about buying a machine that was not what it was sold to be. But there are some good ones out there.. if you do have interest in a machine feel free to ask the forum our opinion

Re: Buying stenciling and pick and place equipement.

Electronics Forum | Tue Dec 21 12:47:25 EST 1999 | Larry

Clarissa, Like any used equipment, make sure both you and the dealer know what you expect from the machine. Ask questions! Make sure you understand what is involved in the refurbishment, if anything. Things like Technical support will be important if


stencil searches for Companies, Equipment, Machines, Suppliers & Information