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Matrix Trays

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#36195

Matrix Trays | 19 August, 2005

Hello, What checks do you guys have in place to ensure operators don't load trays into the machine backwards?

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DannyJ

#36196

Matrix Trays | 19 August, 2005

I usually like to have all the trays use pin 1 in a certain direction. In other words, as you are on the operating side of the machine, all the pin 1's should be on the lower left of the tray. With operators, the KISS principle seems to be necessary.

Another solution that we have used over the years is to have a change log of feeders on the machines. This is to have one person do the change, and then another to verify that it was done properly. Even though this adds time to quick change operations, it does save a ton of rework time.

Most matrix trays that I have dealt with usually are symmetric, so unsure of any way to make a 'key' for them to sit on, or, to have a vision system check for the pin 1. I will be honest, my experience with trays has been limited to a MyData and MPAV (Panasonic).

I hope that these offer some points to ponder, and I'm sure you will receive other responses from much more knowledgable people willing to share!

Dan

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#36197

Matrix Trays | 19 August, 2005

Three strikes and they are fired! Most effective method to keep them awake

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#36208

Matrix Trays | 22 August, 2005

Some machines can check for polarity while doing vision inspection. Although this will differ from component to component, it is a thought to consider.

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#36210

Matrix Trays | 22 August, 2005

Danny, What is the KISS principle ?

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DiveGuy

#36213

Matrix Trays | 22 August, 2005

Keep It Simple Stupid; old saying for engineers not to make things complex. the simpler things are kept the less likely the chance of error.

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PWH

#36221

Matrix Trays | 22 August, 2005

Post a simple CAD picture of a BGA or IC on the door of the machine near where it gets loaded. This has helped us. Flash IC's can also be difficult as you can't always put pin one near front, left of tray slot. So... we always say pin one left no matter if it is on the front or rear of the slot.

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Gav

#36222

Matrix Trays | 22 August, 2005

Hi All, The method that I use when training operators is.. a visual aid that shows the operators what way the trays are placed into the machine and the polarity of the component and also the component change logs. The matrix trays that I have delt with mostly have one corner shamfered (angled) more than the rest, this can be used a reference for the operators as most if not all component suppliers will align the polarity of the component with the shamfer on the tray e.g.Component polarity's QFP/BGA top left, TSOP top right or a PLCC/Socket left but there are exceptions to the rule. Regards, Gavin

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#36231

Matrix Trays | 22 August, 2005

Thank you for your responses. They are very helpful.

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