Electronics Forum | Mon Nov 25 12:32:20 EST 2002 | davef
Now that is a BIG step. Stencil type: * A metal squeegee is fine with stepped stencils. * A rubber squeegee is fine with stepped stencils. Comments on step stencil "keepouts" are: * Use an ample space around the stepped down component pads that is
Electronics Forum | Thu Jan 02 15:32:26 EST 2003 | Mark
Hello. Sometimes metal squeegees DO work with stepped stencils. You will always get much better results with metal squeegees compared to polymer blades. The only requirement for the metal squeegee to work, you need about 0.06 in clearance for eve
Electronics Forum | Mon Nov 25 16:12:52 EST 2002 | russ
there is a good article by AIM solder regarding tin. In a nut shell, if you do not apply flux or heat to tin finish you will never degrade it! I agree with the others that you need to check the thickness of the pure tin layer. We have forbidden ti
Electronics Forum | Mon Nov 25 20:38:39 EST 2002 | davef
That's basically it. In a wonderful world, the oxides flow on top of the flux during heating through reflow. Obviously when compared to reflow soldering, you create much more dross with your wave by: * Pumping a large volume of very hot solder to h
Electronics Forum | Tue Dec 03 12:31:34 EST 2002 | ianlg
Hi Brad If you looking for an excellant new product check out Reprint Services ( http://www.reprintservices.co.uk ) Their R29 Screen printer is selling well in the UK and Europe and has just been launched into the far east. Due to launch this into t
Electronics Forum | Sun Dec 01 00:28:41 EST 2002 | yngwie
What is the danger of using the expired glue or Loctite ? I'm using Loctite 383 and the expiry date was Oct 20th. I refused to use them, and my refusal has caused the downtime incured for 8 hours. Felt guilty, as I knew this glue can still be functio
Electronics Forum | Mon Dec 02 13:55:49 EST 2002 | stepheno
Where I worked we used a different chip bonder. When we had trouble with flux entrapment in the epoxy from the wave solder, we checked the date of the epoxy. The tube didn't have one but the manufacturer gave a shelf life of 6 months and then the s
Electronics Forum | Wed Dec 04 17:53:22 EST 2002 | dave edwards
You wanted someone from Loctite to add their opinion on the matter. Our official statement on expired material is that after the expiration date we can not certify the performance and/or quality of the material. Although most likely the material is g
Electronics Forum | Mon Dec 02 17:49:58 EST 2002 | davef
ODB++ is a manufacturing database much like Gerber that includes: aperture lists, netlists, test files, etc. This "database" is read into Valor Enterprise (CAM) as a "true" representation of your layout database. Valor can supply the scripts that wi
Electronics Forum | Mon Dec 02 16:19:11 EST 2002 | slthomas
Unfortunately it's nc or we'd be worrying about this on the fly. Non-contact is defintely and issue....this is an 18"x9" board with 1500 bottom side SMT parts that are scattered among the through-hole and vice-versa. We're currently using 7 hold-