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Screw footprint and its keep out region

vinhl

I'm tasked with creating footprints for generic screws. There is 1 requirement I do not quite understand. I was told that there is some kind tool/machine that would "assemble" the screw onto the PCB (for high volume production). The head of that tool needs a large area to move around after placing said screw. Therefore I need to take that into consideration.

3 questions:

1- does anyone know what the name of that process is? (I tried searching for anything related to it on the web but came up empty)

2- what is the dimension for such keep out region?

3- should I put it under placement boundary or package keep out? If I put it on both, I'll get a DRC.

Thanks,

Vinh.

  • Hi the process is commonly known as "Automatic or Automated Screw insertion" Typically this is done with robotic arms. The main consideration for the pcb would be the height of surrounding components. A good way to think of it is, if you can get a normal screwdriver in there then you should be ok on the Z Axis height requirement for the machine.

    A good question to ask would be. What is the minimum Z axis height requirement needed to clear components including the physical length of the screwdriver bit.

    I found a video that shows the concept, but since there are many machines to do this task it would be good to check with the assembly house in advance.

    https://www.youtube.com/watch?v=5XbAq8PJLng

    2 - The dimension of the keep out region is dictated by the z axis "Vertical up/Down" movement of the machine. ( There is no board keep out beyond the size of the screw head )

    3 -  You don't really have to do anything out of the ordinary. Make your mounting holes as per the normal way you do them.

    You could get fancy and a a height property to your mounting holes but it wont really buy you anything I think as the whole process is contingent on the machine. 

    Hope this helps..

  • in reply to excellon1

    Thanks for the response. I'll watch the video.

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