Browse Prior Art Database

Vacuum Boost Sleeve

IP.com Disclosure Number: IPCOM000116902D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Miller, BJ: AUTHOR [+4]

Abstract

Disclosed here is a retrofit device designed to increase the available vacuum at the pressure foot of Trudril* Drilling Machines.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Vacuum Boost Sleeve

      Disclosed here is a retrofit device designed to increase the
available vacuum at the pressure foot of Trudril* Drilling Machines.

      The amount of available vacuum at the surface of the printed
circuit board during the drilling operation is of utmost importance.
Thus, vacuum must be available as close as possible to the top
surface of the material being machined.  The level of vacuum
available determines the capability of the machine to evacuate the
debris created during the drilling process.  In Micro-drilling
applications, effective removal of drilling material will prevent
clogging of the flutes which in turn will improve hole wall quality
and prevent catastrophic drill bit failure.  While this application
is directed toward improvement in the drilling of printed wiring
boards the device disclosed here is not specifically limited to this
application and has the potential for improving any process for
micro-drilling of laminated materials.

      The specific process application for this device is the
drilling of small holes (down to .010" diameter) into laminate stacks
that are .200" thick (typically containing three multi-layer printed
wiring boards that are .060" thick).  Improving the vacuum at the
machining surface will improve the hole wall quality and reduce the
incidence of bit breakage.

      As the Figure illustrates, this device is mounted between the
spindle and the pressure foot.  It will compress during the...