Electronics Forum | Tue May 14 20:45:45 EDT 2002 | davef
Ashok Dhawan, an old friend of SMTnet, says: Formula for counting components on SMT tape & reels [spiral belt]: Length = Number of turns * 1/2 * 22/7 * ( dia outer + dia inner), where ... Number of turns = ( dia outer - dia inner) / thickness of
Electronics Forum | Mon Nov 15 12:13:41 EST 1999 | Dave F
Steve: There are guidelines for determining if your aperture has the correct proportions to the foil thickness. Maybe that�s what you�re looking for: 1 Aspect ratio = aperture width/foil thickness Chemically etched SB GT 1.5 Laser cut SB GT 1.2
Electronics Forum | Wed Oct 27 17:59:54 EDT 1999 | John Thorup
How about some of the more rigid materials like the commercial fixture manufacturers use to machine solder/assembly fixtures from? Glastic, an anti-static version of Delmat and proprietary materials from MB manufacturing come to mind. Search the arc
Electronics Forum | Tue Aug 17 10:37:45 EDT 2004 | M.Enright
Some cracks are really obvious,straight down the middle of the capacitor.Some are slight hair line fractures which fail at ICT.In all cases seen,all cracks are through the centre of the cap.My worry is that there may be some which have fractures and
Electronics Forum | Fri Jul 06 12:11:34 EDT 2007 | james
We are starting to see issues with using Kester WS R562 with lead free components. The joints look grainy on almost all of the 0402'2 and other small components. Some of the solder does not solder to the terminations. These are hybrid boards which
Electronics Forum | Wed Sep 01 12:07:31 EDT 2010 | davef
Printing solder paste * Use single stroke, on-contact print cycle * Ensure the substrate is well supported, especially under areas of fine pitch print. * Select pressures of about 1- 2 lbs per linear inch of squeegee blade [Set squeegee pressure hig
Electronics Forum | Mon May 03 15:58:52 EDT 2021 | lt
Koh Young 3030 SPI machine. Has been running for the last 1-2 years. Now, it boots up as expected, up until the point where it should Home, but it does not Home. Any ideas what could cause it not to home. I know the older KY's are sensitive about
Electronics Forum | Thu Dec 02 11:14:49 EST 1999 | Dave F
Michela: Here's an outline for you to fill in the blanks: Policy Purpose Applicability Definitions Applicable Documents 1 Justification Of Spending 1.1 Request Preparation 1.2 Request Content 1.2.1 Summary Section 1.2.2 Capital Appropriation Reques
Electronics Forum | Mon Jun 12 14:33:40 EDT 2006 | pjc
IPC spec is V-score shall not be more than 1/2 board thickness. They should be V scoring 1/4 off top and 1/4 off bottom equally.
Electronics Forum | Thu May 09 17:19:28 EDT 2002 | davef
Can�t help you with the article that you read. Other places to start are: * 2221, 7.2 Heat Dissipation Considerations, 7.3 Heat Transfer Techniques, and 8.1.10 Heat Dissipation * 2222, 9.1.2 Thermal Relief In Conductor Planes
