Electronics Forum | Fri Aug 08 11:44:44 EDT 2003 | Henry
I am fairly new to wave soldering and production processes, but I have been tasked with coming up with a calculation involving the shear strength of some through-hole leads. The leads are tinned copper and I suspect that tinning reduces the shear st
Electronics Forum | Mon Aug 11 17:42:52 EDT 2003 | Kris
How can one go about defining the complexity of a PCB for characterizing reflow profiles A large balanced board may be easier to profile than smaller unbalanced board ? Any ideas how to define an index to calculate the complexity based on size,weig
Electronics Forum | Fri Aug 15 16:00:53 EDT 2003 | Cameron
Take a look at the product here: http://www.kicthermal.com/products/KIC-Auto-Focus.pdf KIC uses a previously profiled product library to calculate in spec reflow profiles for new products. Just enter you dimensions and if finds a solution for you.
Electronics Forum | Sat Sep 06 21:50:09 EDT 2003 | Hoss
Sr. Assuming you are processing the garden variety 63/37 paste on FR4 substrates, a good starting point is to plan for 3.5 to 4.5 minutes of process time on the board. If you measure the total heated length of your oven and you use the range above,
Electronics Forum | Thu May 20 09:29:02 EDT 2004 | Dilbert
Three LEDs, 3.5volts @.02amps each is 10.5volts. You said you calculated out an 82 ohm resistor so 82 ohms * .02amps is 1.64volts, I guess your going to use a 12volt supply. P=I*E =.02amps * 1.64volts =.033watts so a .25watt resistor will be fine
Electronics Forum | Tue May 25 18:12:14 EDT 2004 | gregp
I can't offer a recommendation but I have a question. Doing the math (4 x 430 parts = 1720 parts, 13 minute load time) I calculate 7938 cph. With mostly 0603 components why can't the Hydra head come closer to the claimed 21,000 cph rate? Am I miss
Electronics Forum | Thu Apr 07 10:58:01 EDT 2005 | Dhanish
Need help from the experts on 1)simple way to measure the PCB warpage 2)what is the maximum warpage can the SMT machine allow the to accept and place the component without problem. 3)I have seen some people are using 7mils/inch as a Warpage spec. a
Electronics Forum | Thu Jul 14 11:04:53 EDT 2005 | dougs
yes SPC can be used on a wave solder machine, you should use a c-chart to monitor the amount of defects per board or group of boards, this will let you know if your process is stable, as you improve your process you should re-calculate your UCL, hope
Electronics Forum | Thu Aug 25 20:00:31 EDT 2005 | Dave
Try Heller Industrie's website at http://www.hellerindustries.com They have a formula that they offer for free that calculates land pad geometry to component weight to prevent drop off of components during second reflow. If you can't find it, give t
Electronics Forum | Fri Aug 26 01:02:34 EDT 2005 | Vince
Hi Dave, as you said Heller has forum showing you how to calculate land pad for component dropped off during second side. Unfortunately I couldn't found it. would you please give me that link, instead of just http://www.hellerindustries.com. Thanks
