1 Title of the Invention
Microstop Drill Cage with Whistle Notch Cutting Tool.
2 Field of the Invention
This Invention relates to the field of drilling, in particular to a drilling of countersunk holes.
3 Background of the Invention
Microstop Drill Cage is used in conjunction with pistol grip pneumatic drill
machine -for drilling countersunk holes on Air frames. Miérostob Drill Cage
employs drill tool made from carbide for drilling counter sunk holes. The shank of the bit is threaded and attached to the threaded spindle in the Microstop Drill Cage However, the process of making threads on carbide
material is an expensive operation.
4 Brief Summary of the Invention
This invention aims to solve the expensive process of making threads on carbide cutting tool by replacing with a cost-effective unthreaded spindle
with a precision bore and a grub screw to lock the cutting tool with a whistle notch to aid in effective locking the tool using the grub screw.
5 Detail Description of the Drawings
Figure 1: is a schematic of a Micro Stop Drill Cage with embodiment of the present invention.
Figure 1A: is a cross sectional view of a Micro Stop Drill Cage with
embodiment of the present invention.
Figure 2: is a schematic ofa spindle with a precision bore and a grub screw
hole to lock the cutting tool with a whistle notch running on the existing bearings used in the drilling apparatus of Fig 1.
Figure 2A: is a cross sectional view of a spindle with a preciéion bore and
a grub screw hole to lock the cutting tool with a whistle notch running on the
existing bearings with used in the drilling apparatus of Fig 1
Figure 3: is a schematic of front view of the cutting tool with whistle notch
used in the drilling apparatus of Fig 1.
Figure 3A: is a schematic of right-side view of the cutting tool with whistle
notch with used in the drilling apparatus of Fig 1.
6 Detail Description of the Invention
An aircraft has multiple sections held in place a by thousands of fasteners
that have been installed into precisely drilled and prepared holes. That’s so
the forées that act upon the aircraft during flight. can be evehly distributed
over the plane‘s entire structure. Viewed from this perspective, properly
prepared holes are the very foundation of airframe construction.
When specified the type of fasteners to be used on the specific area of the
aircraft, dictates the tools needed to install these fasteners. Once the hole
location for the fasteners has been determined, a starter hole is drilled.
Ihen, a microstop and a countersink work together to form~the hole; This ~
creates the correct profile and precise depth for installing the fasteners.
A ‘microstop’ is a cylindrical tool that holds a cutting tool (8) known as
countersink. The microstop allows the countersink to move perpendicular to
the cutting surface at precise depth. When countersinking, the microstop
can make micro adjustments(2) up and down, and stop the countersink at
the exact depth to match the profile of the fastener to be installed. The
countersink depth is controlled by rotation the microstop skirt(4).
Extreme precision is important when countersinking a hole because it
enables the ultimafe objective: to ensure that the fastener, typically a flush
rivet. fills the countersunk hole completely, usually a rivet gun is used for
installing and deforming the flush rivet into the hole's geometry.
When each countersunk hole is precisely drilled and fasteners are properly
installed, every part of the aircraft skin has consistent strength and load
distribution. The use of a ‘microstop' allows for uniformity and helps achieve
this goal.
In accordance with the present invention, Microstop Drill Cage with
unthreaded spindle(6) for drilling countersunk holes are provided that
substantially eliminate or reduce the cost associated with making threads
on carbide material in previously developed Microstop Drill Cage. More
5 specifically, a present invention includes a a spindle(6) with a precision
bore(10) and a grub screw(11) to lock the cutting tool(8) running into the
existing bearing(13).
The existing Micro Stop Drill Cage has cutting tool(8) made up of Too! Steel
and carbide brazing or monolithic with threads on shank whereas the
10 present invention has a monolithic cutting tool(8) made up of carbide with
whistle Notch(12).
The existing Micro Stop Drill Cage has a cutting tool(8) whose shank is
threaded and attached to the threaded spindle(6). The procedure to make
threads on carbide material is an expensive operation and it is being
15 fabricated by only few global manufacturers.
The existing Micro Stop Drill Cage was dismantled and the threaded
spind|e(6) holding cutting tool(8) removed and has been replaced with a
spindle(6) with a precision bore(10) and grub screw(11) to the lock the
cutting tool. wherein, a cutting tool(8) is made up of solid carbide with a whistle notch(12) to aid in effective locking of the cutting tool to the spindle (6)using the grub screw(11). Thereafter, the Micro Stop Drill Cage Drill Cage
reassembled with the new spindle (6) with whistle notch (12) cutting tool (8).
Thereby reducing the cost of cutting tool.
We Claim,
1) Microstop Drill Cage with Whistle Notch Cutting Tool comprising:
a unthreaded spindLe(6) with a precision bore(10) and grub screw(11) to
the lock a cutting tool (8). Wherein, the cutting (001(8) with a whistle notch
(12) to aid in effective locking to the spindLe(6) using the grub screw(11).
2) Microstop Drill Cage with Whistle Notch Cutting Tool as claimed in claim
1, wherein the cutting tool(8) is made up of monolithic carbide.
3) Microstop Drill Cage with whistle Notch Cutting Tool as claimed in Claim
1, substantially eliminate or reduce the cost associated with making
threads on carbide material in previously developed Microstop Drill
Cage.