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Odd shape mounting hole

Odd shape mounting hole

(OP)
Hi

How can I create a mounting hole for a thin component legs, this component has two legs, each leg is .02" thick and .06" long. Please help. Thanks you, I am using Altium 6. I f you know how to do it in Protel 99 or 2004, please help me also

RE: Odd shape mounting hole

I am using Protel DXP, and have recently done a design containing a component that had four mounting/grounding legs about the size you described.

I assume your question is more like: "How do I do plated-through slots or oblong holes in Protel?"

The quick answer is - you can't - - - directly.

In my drawings, I have fabrication information (IPC spec references, material notes, plating notes) on the drill-drawing layer (text), dimensions, drill hole information (.legend type text). Where the slot is, I will place a pad at the center of the slot - a pad with a unique hole size. For plated slots in the board, I show where the center of the unique pad is, put a line and arrow pointing to the hole, with text (e.g. "See note 5.") and the Note will refer to a drawn-out "VIEW A" which shows the slot at maybe 4:1, gives the dimensions of the slot, and notes that a particular hole size is actually a slot. This is all done using the PCB package more like it was a mechanical CAD package (thin traces are no different than lines), and put all of these items on the drill drawing layer.

To create a package for the PCB vendor, I not only send Gerbers and drill files, but a .pdf print of the drill drawing layer with all the fabrication notes, which will now have all the information about unusual features, like slots.

When I send the Gerbers, drill file, and .pdf fab drawing out via Zip file to the PCB vendor, I always include a "readmefile.txt" which will again note that certain holes are actually slots. PCB vendors do not blindly throw Gerbers and drill files into their process. They always import the information provided by a customer, and add tooling holes for their machines, plating-bar etch conductors needed for their processes, put your PCB or even panel layout inside a larger PCB panel, add to the outside edge job numbers, customer name, etc.etc. When your PCB is finished, the outside edges with their tooling hole and all the things needed for their internal processes, is routed away, and you never see it. If you have properly documented your PCB, to change certain holes to slots is just part of their setup process.

I believe the fundamental issue is that the industry standard for the drill files does not contain a data defination for a slot in the file formats. The industry is working on such things, but the wider used industry standard for the drill files does not support it. It's not a Altium/Protel problem, other PCB packages have the same limitation.

RE: Odd shape mounting hole

(OP)
Thanks Comcokid

Yours answer is exactly what i am looking for. I think a slot or oblong plated through is sometime needed and a program such as Protel or Altium should addressed, provides easy way for user who do not know much -like me- with some guide line of how to do it.

Thanks again

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