[PEDA] Board warpage?

2004-07-20 Thread Robison Michael R CNIN
This email is not a Protel-specific question but instead concerns a generic problem with some boards I'm getting, so I apologize for being off-topic, but this forum has more PCB experience than any other I know of, so I would like to get your advice. A partner in a manufacturing effort is

Re: [PEDA] Board warpage?

2004-07-20 Thread HxEngr
In a message dated 2004-07-20 11:46:57 AM Eastern Daylight Time, [EMAIL PROTECTED] writes: A partner in a manufacturing effort is sending us full populated boards (ICs and passive components) that are badly warped. We sent them back and rather than get the boards remade and repopulate them,

Re: [PEDA] Board warpage?

2004-07-20 Thread Dennis Saputelli
you'll probably get a lot of different answers 150 deg F is not very hot, and this will probably help but still there will be stresses ... since this bd is doing 'a very important job' you may want to tread lightly what is the measure of 'badly warped' ? how big is the board and what is the

Re: [PEDA] Board warpage?

2004-07-20 Thread Darcy Davis
Further to Steve's point on mechanical stresses on the components... The feasibility of the suggestion from your assembly house may depend on where in the process the boards warped. If the bare board was warped when the solder solidified on the components, then straightening the boards without

Re: [PEDA] Board warpage?

2004-07-20 Thread Harry Selfridge
The important sentence below is These boards perform an extremely important job... My vote would be to have the boards remade, and to ensure that the unpopulated boards pass inspection before population. With respect to the existing boards - I'm skeptical that they can be stress relieved at

Re: [PEDA] Board warpage?

2004-07-20 Thread Dan Enslen
I would have to agree with the previous posts that are skeptical of success with straightening at 150deg F. We typically use FR4 boards here for characterizing semiconductors at 150deg C. It's not recommended but it's a reasonably inexpensive way for us to accomplish our tasks using

Re: [PEDA] Exporting to pdf or Orcad or PSpice

2004-07-20 Thread ajenkins
Tis truly easy to print direct to a pdf from almost any application, including Protel EDA. Adobe Acrobat and a large number of third party PDF printer drivers are available. While Adobe's ~$200 package might be a bit overkill for most of us, the third party solutions range in price from around ten

Re: [PEDA] Exporting to pdf or Orcad or PSpice

2004-07-20 Thread MSIsallen
I've beem using a free pdf writer for the last few months without problems. The free version pops up an IE advertisement when it writes. _http://www.pdf995.com/_ (http://www.pdf995.com/) Regards, Steve Allen Project Engineer Manufacturing Services, Inc. In a message dated