+/- 0.001???

Do they want to pay a gabazillion dollars per board?  What material are they going to use?  What about how
they will measure it?  At what temp and humidity?  With certified plug guages?

Sounds like you got a 'newbie' at board design.  We do millions of through hole board per year and our hole
tolerence is +/- 0.003 except for tooling holes which are +0.004 -0.000 and our leads on our components
meet the JEDEC requirements.  We as a rule take a nominal lead size add 0.015 to it and that it the hole
size for high speed auto insertion of through hole components.  Twelve years at one company doing it this
way, not problems that we know of.  We also allow +/- 0.005 on slots as long as the board is routed not
punch & crunch.  If it is P&C we ask for +/- 0.003.  If you want more info let me know but I dont think
just based on enviromental factors that a +/- 0.001 is acheivable is standard board material like CEM-3
CEM-1 or FR-4.


Mark Ross
Sr. Design Engineer
Whistler Auto-Mation Products


Hugh Scott Miller wrote:

> Happy Holidays Technetters,
>
> A recent project has entered our shop from a customer that is demanding
> that all finished hole tolerances be held to +/- .001".  I pose the
> following questions to the esteemed Technet panel:
>
> a.  Are hole tolerances of +/- .001" realistic?
> b.  How could a board shop with conventional drilling technology
> in-house adjust its process to accommodate this request?
> c.  What type of advanced hole formation  technology (laser, plasma
> etching, etc.) could be applied to meet this requirement?
> d.  Can a component manufacturer produce components with leads that are
> within this tolerance?
>
> Any and all suggestions would be greatly appreciated.
>
> Regards
>
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