Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1996-07-30
1998-07-28
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
408 72R, 408 87, B23B 3500, B23B 4100
Patent
active
057854653
ABSTRACT:
An overlay sheet having a first thin layer of a polymer material joined to a second thin layer of a hard material such as a phenolic, melamine or metal foil. The sheet is applied to a surface of a printed circuit board such that the metal foil is against the board surface, and the first layer is exposed to receive the drill bit. During drilling operations, the drill bit is advanced initially through the softer first layer of the polymer material, immobilizing the tip of the drill bit against lateral movement, then through the harder layer, and finally through the printed circuit board. The harder layer prevents formation of burrs, and the polymer material inhibits drill bit wander.
REFERENCES:
patent: 3700341 (1972-10-01), Block
patent: 3851990 (1974-12-01), West
patent: 4019826 (1977-04-01), Block
patent: 4269549 (1981-05-01), Block
patent: 4311419 (1982-01-01), Block
patent: 4605344 (1986-08-01), Hartmann
patent: 4781495 (1988-11-01), Hatch et al.
patent: 4808046 (1989-02-01), Pilkington et al.
patent: 5067859 (1991-11-01), Korbonski
patent: 5082402 (1992-01-01), Gaku et al.
patent: 5480269 (1996-01-01), Ejiri et al.
patent: 5507603 (1996-04-01), Nakano et al.
patent: 5716168 (1998-02-01), Janoff
"A Guide to Cutting and Machining Kevlar aramid," Kevlar Special Products, E.I. du Pont de Nemours & Co., (Inc.) Wilmington, DE 19898.
"High Temperature Lubricants," Feb. 1951, Chemical Engineering.
Howell Daniel W.
Roberts Larry K.
Systems Division Incorporated
LandOfFree
Entry overlay sheet and method for drilling holes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Entry overlay sheet and method for drilling holes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Entry overlay sheet and method for drilling holes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-17604