Tom Coyle said:

>          I'd like to
>          clear up something.  The standard router bit is not .047"
>          diameter.  It is in the neighborhood of .093" or .125"
>          diameter.  Our standard is .093".

Glad you pointed that out, I was thinking _radius_. As you say, 0.093
router bits are pretty much minimum. I have also heard it recommended that
the minimum width which should be plowed was 0.100", to ensure that the
0.93 bit would be programmed to make two passes in the cut - otherwise the
NC program might make one pass, and wear of the bit affect the size of the
cut..

           Smaller router bits tend
>          to decrease stack height and impact cost.  Router bit
>          diameter comes into play more with inside radii than
>          outside.  Enough of that...
>               More of our customers tend to deal with board corners
>          by creating a "corner break", typically at 45 degrees by a
>          stated length.  This length is not measured "across the
>          flat", but rather how far along each edge the break occurs.


           _         ___
>           _ .xxx"  /      45 degrees X .xxx" (commonly .020"-.030")
>                    |
>                    |
>          We could put a rounded corner on the board, and I'm not sure
>          if we are limited to a certain minimum here or not.  I feel
>          fairly confident that an arc could be created starting and
>          ending .020" along each edge that would in effect cover 90
>          degrees.  Most people ask us to break the corners as a
>          safety concern (Careful: you could poke somebody's eye out
>          with that!).  I hope this answers your question, and I'll
>          see you in Florida.


And they snag going into the conveyor or card guide more readily...

Thanks, it does to some degree. I would still like to see a radius (looking
at a competitors product) on the corners if it can be done reasonably
easily.

Looking forward to the IPC Works if the hurricanes don't get us.

regards


Jerry Cupples
Interphase Corporation
Dallas, TX USA


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