Electronics Forum | Fri Aug 04 13:47:20 EDT 2006 | pemea1
apples to apples. 20 boards 80 parts top and 10 parts bottom. these boards are done on a semi regular basis (you know the boards are coming to you from an OEM at least three times a month, just no exact schedule). All that is required is pasting..mo
Electronics Forum | Wed Aug 09 08:06:07 EDT 2006 | davef
See "IPC-4554 Specification for Immersion Tin Plating for Printed Circuit Boards" 3.2.1 Immersion Tin Thickness. The most common reason for solderability issues with the white tin surface coating during multiple thermal excursions is a thin white ti
Electronics Forum | Tue Aug 15 20:41:54 EDT 2006 | davef
Alpha UP78 was a modern solder paste. Check with your supplier for recommendations. You're are cleaning some flux residue with the IPA and reducing the leakage current. We're not wild about using IPA. Problems with IPA are: * IPA / material being
Electronics Forum | Thu Aug 17 23:24:34 EDT 2006 | guest
I suggest you do the ff prior the machines arrival at your site. - Get all the dimensions of purchased machines from their catalogue. - Lay out / draw their footprints in the manufacturing floor. - Drop down air and power supply. Unpacking, level
Electronics Forum | Sun Aug 20 21:43:19 EDT 2006 | darby
Yes, I agree with guest. Lay it all out with masking tape on the floor. Include the width of feeders sticking out. Confirm the position of power, air, network and smema connections. You may even want to use cardboard layed out on to the floor. You ha
Electronics Forum | Sat Aug 19 14:12:13 EDT 2006 | Wave Master Larry
LISTEN I'll have to disagree Steve.i think this Chunks person oversimplifies stuff and I dont like her style I'm surprised because most orientals do better with analyzing stuff.reminds me of some engineers at my place of employment.Again Im fighting
Electronics Forum | Thu Aug 24 08:49:20 EDT 2006 | nodlac
Hi Jerry- The belt splice kit we used were made by Eagle Belting Company (Now Fenner). You are correct in the splice process...one other thing we did was trim the extra "roll Back" or flash of melted material. I prefer the Mini or regular but splic
Electronics Forum | Thu Aug 24 19:26:07 EDT 2006 | darby
Dave, Cygnal was taken over by Silabs. I based my design on the second link that you provided. Tell me folks, are you using one large pad with only the stencil having the grid, or are you actually breaking up the large pad into grids with mask around
Electronics Forum | Tue Aug 22 13:13:30 EDT 2006 | slthomas
We are a low volume (100k-150k parts per month) high mix shop that is equipped with a couple of Quad IVc's. The machines meet our overall capacity needs but can not give us the quick turns we need if we get hit with multiple large setups at once.
Electronics Forum | Thu Aug 24 15:54:13 EDT 2006 | davef
It depends. What is: * Storage environment and period * Board laminate, epoxy, and copper thickness of PTH * Down stream process * Etc FR4 0.062" thick boards absorb between 0.08 to 0.1%Wt of moisture within a 24 hour period, and 0.2 to 0.23%Wt in
