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pcb layout

Discussion in 'Electronic Basics' started by sp, Jul 18, 2008.

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  1. sp

    sp Guest

    Hai

    I have a small doubt about PCB Layout

    At turning point could we do route at 45 degree's , some one told in
    PCB manufaturing the edge will cutout,we cannot see by eye's,we can
    see that by microscope only.

    suppose we do route at 90degree 's ,may be that path current will be
    short

    plse anybody tell

    what is the correct one and reasons



    Thank u
     
  2. Eeyore

    Eeyore Guest

    Surely you mean more than 90 degrees ? Unlesss I completely misunderstood the
    question.

    Graham
     
  3. DJ Delorie

    DJ Delorie Guest

    PCB uses round-end traces all the time, so even on 90 degree corners
    the outside edge has a (width/2) radius bend in it. What do other EDA
    packages do? Do any of them use sharp outside corners?
     
  4. DJ Delorie

    DJ Delorie Guest

    Actually, in PCB we use round ends because otherwise we have to
    compute gerber apertures separately for each trace angle and end
    junction.

    Maybe you're confusing "round end caps" with "the trace bends" ? I
    mean the former when I say "round ended traces".
     
  5. DJ Delorie

    DJ Delorie Guest

    Well, yes, I know that. I wrote its gerber exporter. I was curious
    if this was standard practice, or if squared-off corners were common
    also.
     
  6. Eeyore

    Eeyore Guest

    I liked tape ups with curves. I still have a box of Brady and other brand stuff.
    The Brady pads were the best IMHO but I used a UK brand tape whose name eludes
    me at this second.

    They have their reasons !

    Graham
     
  7. Eeyore

    Eeyore Guest

    Reminds me. Which packages can do teardrops ? AFAICS only PADS could, at
    least of the packages I reviewed.

    Graham
     
  8. DJ Delorie

    DJ Delorie Guest

    PCB does teardrops, at least, it does the kind I like (another of my
    plugins). I put a page here:

    http://www.delorie.com/pcb/teardrops/

    I suppose there are other types of teardrops, but these solved the
    particular problem I had (copper cracking on inside corners during
    rework).
    You'll like PCB's global puller, at least, when it doesn't scribble
    all over your board ;-)

    Here's a sample board that uses both teardrops and the puller:

    http://www.delorie.com/electronics/usb-gpio/
     
  9. Eeyore

    Eeyore Guest

    Yes, they look nice.

    Not using Linux yet here at the moment. I did sample Ubuntu for a bit
    but I then had another use for the machine.

    How 'intuitive' do you find PCB ? I recenly did some boards using
    ExpressPCB and I quite like it's 'almost manual' approach. It was almost
    a bit like tape-up with aids which suited my needs for a simple job very
    well.

    Graham
     
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