Electronics Forum | Mon Nov 14 17:09:07 EST 2005 | davef
From Alpha Metals: "The test for copper dissolution was conducted by dipping a pre-fluxed copper wire specimen into the test alloys for a specified time period. The change in diameter of the copper wire is measured and a rate of erosion is determined
Electronics Forum | Mon May 07 07:58:29 EDT 2007 | ck_the_flip
A homegrown spreadsheet with all the formulas is the way to go. You must OVER-INFLATE your labor rates too. At my last place of employment, I'd come up with "sound engineering numbers" only to be forced to over-inflate them by the factory manager
Electronics Forum | Mon Jun 05 11:05:39 EDT 2006 | PWH
Our experience has been similar to yours. Not the best placements rates for 0603 caps. I can't tell you an exact reject rate on our machines. We program them as leaded components which seems to help a lot. Also, not using gang picks is best. You
Electronics Forum | Tue Mar 20 23:30:57 EDT 2007 | TRACY M
Yes, but you can expect a 20%+ pickup failure rate. Chuck-based alignment was so 1990's.... :)
Electronics Forum | Sat Mar 04 13:28:53 EST 2017 | ttheis
Could also be the leads catching on the feeder or tray during pick-up. I just had a feeder catching the edge of a lead as the part was picked causing the part to shift and be rejected at severe rates.
Electronics Forum | Tue Jan 10 08:43:10 EST 2006 | jax
There is no set formula. You need to customize this number around your operation. Depending on how you account for: Capital Equipment Costs Utilities Building Costs Overhead services Consumables ( Flux, Paste, Glue, ...... ) Once you get the costs
Electronics Forum | Wed May 03 13:56:14 EDT 2000 | Mark Charlton
Does anyone know a formula for determining my "Excess Capacity"? I know my machine's up AND down time, the effective placement rate, and my idle time. If my manager asks me what out "excess capacity" is, how do I use my "knowns" and calculate an ac
Electronics Forum | Wed Apr 06 08:18:19 EDT 2011 | don7888
Hi Has anyone managed to accurately produce a spreadsheet or formula that will accurately calculate the amount of boards your SMT line will produce an hour. I work in a high mix low volume industry and we are constantly taking on new jobs but have n
Electronics Forum | Thu Feb 13 12:57:43 EST 2003 | Claude_Couture
So, to really get reliable pickup rates from new bulk feeders, I just need to replace all the chip shooters we have with more recent ones with pickup correction capability. So where is the saving? ;-) -Upside down resistors? not an issue. so what if
Electronics Forum | Sun Jun 18 13:15:57 EDT 2000 | Kevin Simpson
HI, We have placed with both Fuji Qp's and Universal Gsm's. We are running a small coil now on a Gsm with a sucessful rate.The Qp done well also, but the product is not ran on a Qp line, so no true production rate has been determined.I don't feel
