Electronics Forum | Wed Jan 18 10:35:17 EST 2006 | pms
Thanks folks !! I'll experiment with the bottom side heaters. Unfortunatly I don't think our Vitronics-Soltec oven has the option for adjusting the heater fan speeds. And I'll check the conveyor chains. This is our first project using 0402 parts, wh
Electronics Forum | Wed Jan 18 16:16:37 EST 2006 | Darnell
Samir brings up uh pimp-tight point wiff convection ovens. The flow rate o' da fans can move parts, which can cause tombstoning ta very light/small components. Also, check ya conveyor an' or chain. If it iz not running smoothly, even uh slight shak
Electronics Forum | Wed Sep 05 13:45:36 EDT 2007 | john_smith
Ian, We currently have 2 inline vapor phase ovens and 1 batch oven. Tomb stoning is inherant with the Vapor phase systems but most can be stopped with a good profile. Most of our mechanical problems occur with the inline ovens during carrier transfer
Electronics Forum | Thu May 10 15:32:45 EDT 2012 | 14367
We are having a lot of tomb stoning with this no clean solder paste. It's limited to larger, complex boards, affecting 0603 ferrite beads, capacitors and SOT23s. It was suggested that paste removed from a stencil should not be put back in it's origin
Electronics Forum | Mon Jun 18 13:29:34 EDT 2001 | nifhail
What is the recommanded profile for board which consist of 0402 & 0201 comps. to reduce the effect of tomb-stone. Slow ramp rate ? how slow is considered as slow. Soak time 60 or 120 C,at which end should I stick to? what is the best time before reac
Electronics Forum | Tue Aug 18 10:11:04 EDT 2009 | grantp
Hi, Yes, I think this sounds like a form of tomb-stoning, and we used vapor phase until it ended up driving us totally nuts trying to deal with tomb-stoning. We tried everything, and all kinds of stencil apertures. Vapor phase is an amazing process
Electronics Forum | Wed Mar 28 14:38:07 EST 2001 | CAL
Phil- A Technology you may want to give serious consideration is the Original Solutions UV-OS-1. No gold PCB's, 100% accurate,and a Money back guarantee - IMPRESSIVE! We did the studies on the Original Solutions Boards and were amazed with the techno
Electronics Forum | Wed Jul 03 10:30:48 EDT 2002 | davef
First, it's difficult to image anyone [that's fallen off the turnip truck more than once] saying 'there is absolutly no problem' about anything in our business. Second, I have never heard of this �U� shaped 0402 aperture thing. [As someone mentione
Electronics Forum | Wed Mar 05 08:12:56 EST 2003 | nifhail
Hi Mike, How do we measure the O2 ppm in N2 environment. I don't understand why the customer keep insisting me to use N2 instead of Air. I don't see the need for it as I done have any soldering issue. Can you share with me why N2 is needed at the fi
Electronics Forum | Sun Apr 20 08:27:21 EDT 2003 | davef
Your link doesn�t work. It gives an application timed out message. Pads on the board that are too large or spaced improperly for the component usually cause skewing. Tombstoning and skewing are first cousins. Look here: http://www.smtinfocus.com
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