We use non-undercut drills (Tycom 560/580) for standard epoxy products.
Undercut drills (Tycom 460/480) are used for PTFE and similar systems
were heat build up needs to be minimized.  With undercut drill the
trade-off is accuracy while the advantage is less heating of the hole
because of less contact area.


Jeffrey Bush
Director, Quality Assurance and Technical Support

                          76 Technology Drive - POB 1890
                             Brattleboro, Vermont 05302-1890
                                Tel. 802.257.4571.21 Fax. 802.257.0011
                                    [log in to unmask]
                              http://www.vtcircuits.com	



-----Original Message-----
From: Parial Swati [mailto:[log in to unmask]] 
Sent: Thursday, April 08, 2004 12:20 AM
To: [log in to unmask]
Subject: [TN] Types of Drill Bits


Dear Technetters,
I would like to know what are the types of drill bits in use for PCB
Drilling both for Double side and Multilayer rigid pcbs. Whether
standard drill bits are more widely used or it is Under cut drill bits ?
Thanks and Regards, Swati...

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