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Home FAQs - Drill Holes

QualiEco FAQs

Know everything about us, our services, our methods, manufacturing related issues etc. by browsing each FAQ category one by one. - FAQs - Drill Holes
  • For plated through holes in my design, does your plating affect the hole size in finished PCB?We consider hole sizes given in your design as finished one and do reverse calculation to find out what should be the actual drill tool size so that plating is compensated. Normally, we add 0.1mm & 0.15mm plating tolerance for all via and component holes respectively. This means, via hole of size 0.3mm in your design will actually be drilled with 0.4mm drill tool. The same mathematics applies for component holes as well.
  • How do I know the drill size that has been defined in my design will be appropriate for the component?The general rule of thumb when you design your custom library parts is that if your component lead is X mm your drill hole should be X+0.3 to 0.4mm i.e. if your component lead is 0.4 mm you must provide 0.7 to 0.8mm drill hole.
  • How do you make sure NPTH (non-plated through) holes align perfectly with other PTH holes?To avoid any misalignment between PTH and NPTH holes, we always (unless specified) drill NPTH holes at the same time as PTH holes and make sure NPTH holes never get plated.
  • Can I provide overlapping holes in my design?We notice many times that designers use overlapping holes in drill layer for slot information instead of providing separate layer. This is actually an incorrect practice and could confuse manufacturer. Normally, overlapping drill holes are always deleted before final design goes in production. So, if the CAM engineer overlooks to check slot possibilities at that location, you may end up having PCBs without slots. Therefore, it is the best practice if slot information is provided in a separate layer (e.g. mechanical layers).
PCB Design Tips

PCB Design Tips

When designing a PCB, try to limit
the amount of draws you use.
Draws use a lot of memory and slows the programming time. Ex.: Use a flash for pads instead of draws. If for some reason we need to increase or decrease that pad size, it can easily be done by changing the D-code but if they are done with draws it could be a nightmare.

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What our client says?

QualiEco Circuits Limited has the potential to be an excellent supplier to us! We appreciate the quality of service and support that we receive from QualiEco Circuits. Always deliver what is promised.

Susan Chuard
Quality Assurance Supervisor