WE currently use vias with pads of .024" to .028" and holes of .014" to .018".  
The spec on the holes is +0"/-closure.  There is no filleting allowed presently, 
but we to permit 90 degrees of breakout(not at the conductor junction).

My questions are as follows:

1)	What are the risks of the present specification?
2.)	What are the risks and benefits of filleting the via pads?  Can any 	
electrical problems arise from this?  If so, what?
3.)	If you recommend filleting the via pads, do you do it in house or do you 
	have your supplier add the fillets?  What do you recommend for existing 
	designs where there is a cost to revise the artwork?

Tim Fowler
BENTLY NEVADA CORPORATION