Electronics Forum: two passes (Page 1 of 22)

manual stencil print 2 passes

Electronics Forum | Tue Dec 23 17:34:07 EST 2008 | davef

We hear you talking two main issues: 1 Solder paste release 2 Thoughts on using two passes of solder paste on the stencil 1 Solder paste release * Check your aperture & aspect ratios [Search the fine SMTnet Archives for more] * Do a better job with

manual stencil print 2 passes

Electronics Forum | Mon Dec 22 12:14:15 EST 2008 | pcbbuilders

we sometimes have problems with solder paste release. we use a manual stencil printer. does anyone have any thoughts on using two passes of solder paste on the stencil? i have found that running the second pass gives me better deposits on the fine pi

Dek 249 loosing print speed setting after a few passes

Electronics Forum | Thu Jul 21 22:22:50 EDT 2005 | Ken

Hey, Peter. back in the mid 90's I reversed engineered their drive system because of a dispute over print speed malfunctions. I prooved correct that they had made published claims about their drive topology that were not true. They agreed to redes

Isolate two power input connectors from each other

Electronics Forum | Mon May 02 14:10:24 EDT 2016 | gan_ceanach

Hi, Could someone point me in direction (article, project, schema or company that could do this prototype) how to isolate two power inputs (A and B) connectors from each other? When A is connected it does not pass current to B connector? Also on

Re: Double sided smt

Electronics Forum | Sat Nov 06 14:58:45 EST 1999 | Gary Moravchik

Assuming you are using Sn63/Pb37 solder paste, have you tried using a lower temp melting point solder paste for the second pass? For example, use 63/37 for first pass and a Bi58 compound solder paste for the second pass. If I recall, Bi58's melting

Wavesoldering Defect

Electronics Forum | Tue Sep 14 03:14:52 EDT 2004 | Adam

Hi Has anyone see a defect,where after one pass over the wave, pins on conectors seem to have a tenancy to have a mimimum solder fillet on the bottom-side of the board. There seems to be no trend, It could range from half a dozen to two dozen from b

Potting/Conformal Coating

Electronics Forum | Thu Feb 25 14:52:52 EST 2016 | tombstonesmt

How thick are their requirements? A barrier can be made using peelable latex. That would then require manual or automatic dispense of latex to create a dam. Then you should be able to use an automated dispense system with a large orifice and flood

Working Paste Before Printing

Electronics Forum | Wed Mar 20 11:55:19 EST 2002 | slthomas

Interesting. Ours failed miserably. Of course we toss everything on the stencil at the end of a shift (they are instructed to let it run down to minimal volume on the stencil as they approach quitting time) so it's not an issue. We are more concer

Oven Profile

Electronics Forum | Wed Apr 16 14:50:48 EDT 2003 | jonfox

sounds like a profile for some type of adhesive. depending on your required profile (manufacturer supplied) make sure that it matches it. For most adhesives (loctite, etc...) you just have to make sure it reaches a certain temp (150C for example

Chinese Production SMT Machines???

Electronics Forum | Fri Mar 02 03:14:01 EST 2018 | reckless

The budget is tiny, I agree. It is more to get our feet wet. We are mostly afraid of adding more steps in the process thereby making it more difficult to implement. I want to avoid a wave soldering machine and also want to avoid making two passes

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