Electronics Forum | Tue Jan 22 22:38:57 EST 2008 | davef
A minimal ventilation rate of 0.05 cfm per square foot, the recommendation of the 1998 International Mechanical Code. However, this may not take into account other potential building contaminants from such sources as propane forklifts, which require
Electronics Forum | Wed Jan 23 13:39:04 EST 2008 | davef
Ventilation rates express the flow rate of outside air brought into a building and are typically normalized by the volume of space being ventilated (air changes per hour), by the area of the floor being ventilated (cubic feet per min (cfm) per ft2) o
Electronics Forum | Tue Mar 18 05:32:09 EDT 2008 | gregoryyork
What volume of boards are you putting through. 1Kg per hour does sound very high but then again it does depend on volume Using an antioxidant is a must with Lead Free some alloys have additions in them to start with but those drop out with use so th
Electronics Forum | Fri Jul 04 00:36:25 EDT 2008 | shrek
Try a linear, very flat ramp rate on the order of 0.5 degrees celcius per second. I know this is hard to accomplish with a five zone, but try to lower the first couple of zones (the preheat zone), and then spike to reflow aggressively during your la
Electronics Forum | Sun Sep 14 06:37:11 EDT 2008 | johnjohn
Hi All, I am trying to work out the OEE of my NXT equipment to IPC. I am presently trying to work out what metrics I need can anyone help me with this. I think I need the following Machine rating IPC 70% of machine rating, cycle time, What I am tr
Electronics Forum | Thu Oct 15 16:11:50 EDT 2009 | rrpowers
We've been using Vi machines for 6 years now and love them. For us they have been quick to program, good at optimizing, and excellent at low false fail rates. The vision tools also gave us more accurate component data. We had problems with high fa
Electronics Forum | Wed Dec 02 20:11:37 EST 2009 | prodivegsr
Hi Lou, we are using a fluid dispensing machine. our current requirement is around 50um. From the Datasheet,the thinner 73 has a higher evaporation rate of 1.0 comapring with thinner 521 at 0.6... does the higher evaporation rate eliminate the bu
Electronics Forum | Tue Feb 02 17:10:03 EST 2010 | flipit
Remember this is a 30 layer PCB. If it is built in a multi up panel, there is lots of room for error. Lets say there are 10 circuits per panel. Say you have a 10% scrap rate that happens randomly within the 10 up panel of circuits. Apply this 10%
Electronics Forum | Wed Mar 03 19:30:37 EST 2010 | dcell_1t
Yes, it is basically: Rate = Time interval/Cycle time I put time interval since you can measure however you want (pc per hour, per day, per quarter hour... it is relative) the most used is Pc/Hour, so the time interval is 1 hour (3600 sec). Lets sa
Electronics Forum | Fri Jul 09 19:20:49 EDT 2010 | rway
This table, is it in a database? And is it indicating the number of component, solder insp. etc based on one board or one panel? It needs to be based on the total number of inspection on your panelized pcb. The equation works, you may just be look
