Electronics Forum | Wed Aug 01 15:31:09 EDT 2001 | neil
I recently reindexed the forum search engine and that has greatly reduced the ammount of time for a forum post to complete - from an average of 70 seconds before to an average of 4 seconds now. I will be setting up a schedule to automatically reinde
Electronics Forum | Tue Feb 19 19:33:44 EST 2002 | davef
Since yer talkin� $$$$, non-quantitative measure do not apply. I understand someone told you to do payback. But, we don�t use payback for multiyear projects. Regardless, the analysis is similar. For each machine, set-up a multiyear spreadsheet li
Electronics Forum | Wed Mar 06 10:55:17 EST 2002 | monty2224
We have developed a Cost of Ownership model that incorporates a number of factors when considering SMT equipment. There are the obvious ones like maintenance costs, labor costs and shift patterns. We also considere utilities, quality, set-up time a
Electronics Forum | Tue Feb 19 08:48:01 EST 2002 | wen1555
Payback can be calculated in many ways. The main issue is what revenue/margin you can secure from the investment. You need to decide the period in which the equipment will depreciate, I would suggest 5 years max. Obviously devide the total cost by 5
Electronics Forum | Tue Jan 16 16:59:39 EST 2007 | realchunks
Pallet angle is usually pretty good. Lead length is also another good thing to keep as short as possible. Air Knives don't work that well. Also check your board. Make sure you have solder resist between each and every thru-hole pad. If the board
Electronics Forum | Wed Apr 05 22:38:22 EDT 2000 | Dave F
Mike: Claude makes excellent suggestions. I'll add perform more product set-ups to increase the variety of product being assembled to be able to respond to customers better, sell more product, and increase machine loading. So then, you have to ask
Electronics Forum | Wed Sep 08 07:06:36 EDT 2004 | peter016
Hi Rob, Thanks for the reply. Our boards are 4 ~ 6 ups and mostly double sided. The ratio between chips and IC/Odd shape varied from products to products. So, line balancing between chipmounter and GSM is tough to do. Some boards are mirror image to
Electronics Forum | Thu Apr 15 10:09:55 EDT 2010 | davef
Dross formation rates for SnCu and SAC are roughly 2.5 times the rate for SnPb (Hwang et al., 2004) Methods for reducing dross are: * Lower pot temperature * Run pump speed slower and only when soldering * Check solder contaminants to BS219, ASTM
Electronics Forum | Thu Apr 22 09:57:11 EDT 2010 | davef
Ralph Woodgate is the 'god of wave soldering process control.' We believe he is now retired, but in olden times his presentations at SMTA meetings were 'DO NOT MISS.' We imagine you can find his books on the used book market. Look here: http://use
Electronics Forum | Tue Jul 19 09:18:14 EDT 2011 | davef
Could this be an opportunity to explore the use of cartridge-type paste dispensers? Or maybe a reason to keep working over the weekend. * Re-Storing & Re-Using “Used” Solder Paste. Though not a recommended practice, used solder paste from the stenci
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