Electronics Forum | Wed Nov 16 08:53:26 EST 2005 | nkbkiran
Once the gerber files and BOM list are generated by CAD packages for download on to SMT production line....How is the cycle time of that PCB operation determined? Is their information with in Gerber files by which you can estimate, before actual pr
Electronics Forum | Thu Nov 17 13:48:42 EST 2005 | stepheniii
And don't forget to implement the "Scotty" technique for estimating time.
Electronics Forum | Wed Nov 16 11:20:29 EST 2005 | nkbkiran
AJ Thanks for the reply --you answered my question regards
Electronics Forum | Wed Nov 16 09:32:46 EST 2005 | bobpan
If its newer equipment.....and newer software.....usually the software for the smt machine will tell you the estimated time once the board has been programmed. If its older equipment.....get the old stop watch out.
Electronics Forum | Wed Nov 16 10:56:43 EST 2005 | aj
The latest software packages and stopwatch will do the job but if your manager is anything like mine he wants to know straight away from the BOM. If you split the bom down between placement machines i.e. caps and resistors etc on chipshooter and ICs
Electronics Forum | Wed Nov 16 11:09:11 EST 2005 | nkbkiran
Bobpan ..Thanks for the 1st input Let me ask in a little more detail The controller on SMT machine will understand the X-Y positions to mount the chips/transistor based on a given centroid in gerber file---the software on machines like Fuji, Assem
Electronics Forum | Thu Nov 17 23:33:08 EST 2005 | darby
If the machine is on it's way..... Question is 1. What if the machine is on its way / remote site...and need to estimate (say 90-95%) probability ? A1. 1 x 8 hour shift 65% x 1 of software estimate or stop watch estimate run on same machine in a dr
Electronics Forum | Tue Mar 17 10:47:56 EDT 2020 | davef
IPC-1601 covers PWB bake-out, methods for determining optimum bake time and temperature, caveats for certain PWB plating finishes, etc. IPC-1601 is to bare boards as J-STD-033 is to components
Electronics Forum | Fri Feb 28 08:57:34 EST 2003 | davef
We used to bake [100*C for 6 hours] all of our boards, but no longer bake at all. Before going off, your bake recipe is probaly OK. If anything, it's probably too short. Consider measuring the weight of wet boards, baking for a time, measure, bake
Electronics Forum | Sun Jan 19 10:45:04 EST 2003 | davef
For laminated FR4 PCB, we bake between 6 and 24 hours at 100�C. [Search for other bake recipes in the fine SMTnet Archives.] Alot of the determination of baking time is a function of: * Amount of moisture absorbed. * Amount of moisture you need to r
