Electronics Forum | Wed Apr 06 09:33:51 EDT 2011 | markhoch
A "quick and dirty" method would be to start tracking your assembly time per job. Divide by the number of PCBs built, divide again by the number of components per board. This should give you an average placement time per part. You can then use this n
Electronics Forum | Tue May 10 15:57:43 EDT 2011 | jamike
Hi I am responsible for the whole of production and test and have been given the job by my manager to get accurate job times on all assemblies timing various staff. I have 18 years experience working in all areas of production and test so I know the
Electronics Forum | Tue Jun 12 08:53:32 EDT 2012 | davef
It's unrealistic to have an operator available for '0.003 sec.' Consider the total time it takes an operator to load a board. * Stop doing whatever he/she was doing prior to the call 'load board' * Secure tools or other gear * Move to load board loca
Electronics Forum | Thu Oct 04 10:54:11 EDT 2012 | eniac
I have only one incredible idea: this is example of different speed of heat transfer of neighboring pads. I saw it two times during last years, but on lead solder pastes (Sn63Pb37). The reason of this mistakes each times we found two: 1. errors duri
Electronics Forum | Fri Jul 12 17:48:38 EDT 2013 | ericrr
So why is the number of wraps = (Outside diameter - inside diameter) / twice the the thickness of the tape surely if the tape thickness was 5mm and you had 20 wraps it would take up 100mm not 200mm. I made a posting here some time ago, over a year
Electronics Forum | Wed Feb 19 19:20:41 EST 2014 | comatose
That's a pretty vague question, especially if you count "ID" in the time. In a world where you have AOI or in circuit testing telling you which part has to go, limited thermal mass to contend with and decent equipment, I'd say thirty seconds. On my
Electronics Forum | Mon Jun 30 03:21:38 EDT 2014 | sramos
Thanks Alexei for your advice. I consider mainly high-volume production with tape/reel feeders for most components and tray for big ICs. My ultimate goal is a cost estimation of the production activities. So departing from a parts-list, I need to est
Electronics Forum | Tue May 03 23:27:03 EDT 2016 | adamjs
I've successfully refrigerated a pasted board, and placed/reflowed it the next day with minimal issues. Me too. I'm looking for more than one day. > You might want to invest in a stencil cleaner Tried that. They do not work on the high-aspect ra
Electronics Forum | Wed Feb 19 09:15:28 EST 2020 | klofgren
@Evtimov My company only recently got our SMT line operational and are just starting to estimate PCBA time. I just wanted to clarify, it seems that your formula will boil down to the number of panels multiplied by the bottleneck operation. Is there
Electronics Forum | Wed Feb 19 16:26:35 EST 2020 | stephendo
IPC tried to develop a standard to compare machine throughputs. The machine placement times are usually based on very few components with optimum feeder placement and a very large array of placements. Real life boards are rarely like that. Once I wor
