Sorry the system sent the message before I finished it. Having problems with Comcast E-mail.
Depending on what your needs are relative to cost for performance and volume there are many platforms.
1. The table top units are lowest cost and serve not only for assembly but also for replacement of connectors and leaded modules. The quality of the process is dependent on the skill level of the operator. By training, certifying and dedicating the same few people the results have been excellent. These are not volume setups and are best when the same size nozzle is used for batches of boards. They are not good if different size parts and different board oreintations are needed. In this case you would either need two machines or process the boards in one setup then run again on the other setup.
Vendors of manual floor or table top selective systems are Premier Tool Works $80K+ and Wenesco $22k floor model with preheaters.
2. Low cost programmable Selective Solder System assembly only are: Ace Kiss 102 and the new Seho.
They offer the most flexibility and quick change over from one solder pot to another and nozzles. Although they say the process is repeatable since it is a programmed device the results vary due to lead lengths, clinching angles, board sesign relative to distance of adjacent SMT components or hight of adjacent components, board warp and machine tolerance and all combined. The speed is faster than hand solder but you may need racks to store the boards with bridges and insufficients when soldering Pb-Free.
To reduce some of the machine tolerances if your programming on a system with stepper motors, then try to proceed in a continuous direction rather than skipping around and reversing directions to avoid backlash. If you pay extra for servo motors than you'll improve the machine tolerance and have to deal with all the major human assembly, cut, clinch and warpage from the SMT process and of course the design and tape of liquid mask that was added to adjacent parts that ran into the hole or covered the pad. The prep errors look like solder errors at the end.
3. The more expensive systems$100K like the Vitronic series are very expensive but have additional features and are very well made.
- They have the best programming features especially for multi-up panels and ability to skip certain boards in the panel.
- The programmable board rotate and tilt capability allows you to get to solder joints that can't be done on other systems.
- The programmable micro dot fluxer allows you to change the amount of flux for a particular solder hole size.
- The system allows one board to be preheated while one is being soldered and feeds the board from the conveyor preheater to the gantry pick-up station as soon as the gantry robot placed the completed board down in the output conveyor.
The MySelective series is now manufactured in New Hampshire and they have a great demo area with wave, selective and reflow systems to program your test boards and qualify the system your interested in. Contact John Norton.
For mass production they have a version with a multiwave nozzle that solders all the components at one time. The process is flux, preheat and solder. A large board or multi-up panel may take about 2 minutes with none of the downtime that you have with wave solder. Design spacing is key because if the distance between some PTH parts are too close the adjacent connector leads could land on the top of the adjacent nozzle and lift it up. The multi-wave nozzle is very expensive, they say 2K - 6K, ours cost $8K.
Attached are the pictures of the system we bought that had two solder pots, the mutliwave and the selective solder nozzle for DFM and assembly. We would then transition the multiwave solder plate and program to the volume facility. For our use we used the Selective solder nozzle. Hope this brief summary helps.
John Goulet
Process Engineer
----- Original Message -----
From: PBenke
To: [log in to unmask]
Sent: Thu, 25 Mar 2010 18:49:17 +0000 (UTC)
Subject: [TN] Selective Solder Equipment
All,
We would be appreciative of learning members' experience with,
or knowledge of, selective soldering machines. Particularly those
which utilize molten pot/fountain technology. Insights as to specific
sources would be great.
Thanks! If preferred, OK to reply directly to: [log in to unmask]
Paul Benke, Zero Defects International
Paul Benke
www.zdefects.com
Ph: 408/986-8522
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