Electronics Forum: (4) (Page 90 of 631)

Re: CP4-2

Electronics Forum | Tue Dec 14 16:46:28 EST 1999 | K3 Equipment

Larry, Most likely coming from L & M guide at placing station. Depending on size of bearing, also could be bouncing up from z axis.

Re: Poor solder joints on QFP 100's

Electronics Forum | Tue Dec 14 03:26:09 EST 1999 | Chris May

Steve, Two good reference books to have are 1) SMT Soldering Handbook by Rudlof Strauss (ISBN 0-7506-3589-4) 2) Soldering In Electronics by R.J. Klein Wassink( ISBN 0-901150-24-x) Regards, Chris

Re: CP4-2 XY Table

Electronics Forum | Fri Dec 03 08:06:23 EST 1999 | Mark Anderson

Firstly, Verify your Z-height per the procedure in the Maintenance manual. In general, release the placement stopper and rotate cam onto flat surface of board with z-axis at zero. There should be 0.15 mm compression of the spring

Re: CP4-2 XY Table

Electronics Forum | Sat Dec 04 12:47:36 EST 1999 | Robert Halliday

Run a DTI over the X and Y edges of the table to ensure that your XY table is flat, adjust the four small screws to suit. Also check that the Z cams are not worn and that the Z cam followers are not siezed or worn(they are prone to flat spots when wo

Re: patchproblem lifted lead

Electronics Forum | Tue Nov 30 18:33:05 EST 1999 | Brian W.

I have used Loctite, RTV3145, or Tak-Pak to secure the wire. As John said, the wire is usually secured to the board near the lifted lead, and usually at 1/4 inch intervals along the way. Brian W.

Re: PD for CP4-2

Electronics Forum | Wed Nov 24 06:38:57 EST 1999 | carl

Hi Larry; Have you tried just to place it as a square. Or if all fails try vision 254 255. Just be carefull with this as it will place nothing if the reel runs out. Give me a call.

Re: PD for CP4-2

Electronics Forum | Tue Nov 30 14:47:34 EST 1999 | EmJay

Larry, TRy using #254 and front light the part. When you define the leads leave plenty of tolerance and use a P-Pattern of 34.

High Tg laminates

Electronics Forum | Tue Nov 16 18:02:29 EST 1999 | John Holland

What are the main advantages of moving from a 140 degree C FR4 laminate to a higher Tg laminate 180 degree C ?. Would the higher Tg laminate be less susceptable to bow and twist ?. John Holland

Re: Suitable temperature for solderjoint ?

Electronics Forum | Tue Nov 16 11:02:46 EST 1999 | Dave F

Wolfgang: A snipet of information that maybe more on track that the previous babbling: The temperature limit for FR4 is 130�C according to UL746(?) Good luck Dave F

Re: AQL values....how low can you go ?

Electronics Forum | Mon Oct 25 21:18:55 EDT 1999 | Dave F

Joe: I�m certainly pushing my luck here with more calculations: sigma dpmo AQL 3 2700 ~0.15 4 63


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