FIELD OF INVENTION.
The present invention relates to sleeves used in machine-drilling of holes on jobs
generally unapproachable by the spindle of Boring machine and or Drilling machine.
More particularly, the invention relates to a taper sleeve to facilitate manufacturing of an
oil duct in a complex location of a turbine bearing.
BACKGROUND OF INVENTION.
In the Drilling Operation of the Jobs where internal diameter is such that the machine
spindle diameter is touching with the job while drilling at an angle and the distance of" the
holes drilled is greater than or equal to 400M.M, the prior art sleeve fails to configurate
good quality of holes on the complex locations of the jobs.
There are examples where a plurality of prior art sleeves including a drill were joined
together to overcome the problems. A long-sleeve has also been developed which in the
operational phase occasionally fouls with the job's internal diameter and further does not
totally solve the constraint of un-approachability in respect of circular jobs, in particular
manufacturing of an oil duct in the internal diameter of a turbine bearing.
The prior art devices have the disadvantages that combining a plurality of sleeves to
attain approachability results in ovality in the jobs, for example 0.07 to 1.01 mm.
further, using a number of sleeves increases the time and cost, apar from being
susceptible to risk hazards. The present inventors have ascertained that the prior art
sleeves including the long sleeves consume at least 8 1/2 hours of cycle lime per oil duet
including setting time which consequentially warrants consumption of higher amount of
electricity during the cycle time.
It is therefore an object of the present invention to provide a taper sleeve which overcome
the disadvantages of the prior-art.
Another object of the invention is to provide a taper sleeve which is adaptable to both
boring and drilling machines.
A further object of the invention is to provide a taper sleeve which provides greater
distance from the centre of the machine spindle to avoid touching of the spindle with the
job.
SUMMARY OF THE INVENTION.
Accordingly, there is provided a taper sleeve adaptable to one of a horizontal boring
machine and a drilling machine for manufacturing of" an oil duct in a complex
location of a turbine bearing, comprising: a first portion and a second portion
configured from an one piece solid metal tube, the first portion constituting a
gradually tapered configuration having a first end and a second end. the second
portion comprising a gradually tapered configuration in an opposite direction starting
from said end . the taper dimension selected for the first portion being different than
the second portion . wherein an internal tapered slot is provided at the first end of
the first portion for accommodating a drill bit. and wherein a second slot being,
provided at a distal end of said second portion to accommodate a spindle of one of
said horizontal boring machine and the drilling machine.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig. 1- shows a prior art sleeve device formed by joining five individual sleeves in a
manufacturing operation of complex holes with the help of a horizontal boring machine.
1 ig. 2- shows a sleeve in an operation by means of a horizontal boring machine according
to the present invention,
Fig. 3- shows a schematic diagram of a taper sleeve according to the invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENTS OK THE
MACHINE.
Fig. 3 shows the taper sleeve of the invention having a substantially long cylindrical
configuration. A first portion (A) constitutes a gradually tapered configuration having a
first end (C) and a second end ( D). A second portion (B) constitutes a gradually tapered
configuration in an opposite direction starting from said second end (B) of said first
portion (A), the taper dimension selected for the first portion (A) and the second portion
(B) being different. An internal tapered slot (E) is provided at the front end (C) of the
first portion (A) for accommodating a tool. A second slot (F) is provided at a distal end
(G) of said second portion (B) to accommodate a spindle of a machine.
We Claim:
1. A taper sleeve adaptable to one of a horizontal boring machine and a drilling
machine for drilling oil duct in a complex location of turbine bearings,
characterized in mat it comprises of
-a first portion (A) and a second portion (B) configured from an one piece solid metal
tube, the first portion (A) constituting a gradually tapered configuration having a first
end (C) and second end (D), the second portion (B) comprising a gradually tapered
configuration in an opposite direction starting from said second end (D), the taper
dimension selected for the first portion (A) being different than the second portion (B),
wherein an internal tapered slot (E) is provided at the first end (C)of the first portion (A)
for accommodating a tool, and wherein a second slot (P) being provided at a distal end
(G) of said second portion (B) to accommodate a spindle of one of said horizontal boring
machine and the drilling machine.
2. The taper sleeve as claimed in claim 1, wherein the length of the taper sleeve is
designed at a length of about 600 to 700 mm.
3. The taper sleeve as claimed in claim 1, wherein the taper dimensions of said first
and second portions (A, B) are preferably internal morase taper (MT1) and
external morase taper (MT3) respectively, as selected from standard morase chart
and wherein the length of the first portion (A) is preferably between 300 to 500
mm.
4. The taper sleeve as claimed in claim 1, wherein the diameter of the first portion
(A) at said first end (C) is between 15 to 20mm.
5. The taper sleeve as claimed in claim 1, comprising a metal tube of grade C 40.
6. A taper sleeve adaptable to one of a horizontal boring machine and a drilling
machine for drilling oil duct in turbine bearings as substantially described herein
with reference to the accompanying drawings.

This invention relates to a taper sleeve adaptable to one of a horizontal
boring machine and a drilling machine for manufacturing of an oil duct in a
complex location of a turbine bearing, characterized in that it comprises of
a first portion (A) and a second portion (B) configured from an one piece
solid metal tube, the first portion (A) constituting a gradually tapered
configuration having a first end (C) and second end (D), the second portion
(B) comprising a gradually tapered configuration in an opposite direction
starting from said second end (D), the taper dimension selected for the first
portion (A) being different then the second portion (B), wherein an
internal tapered slot (E) is provided at the first end (C)of the first portion (A)
for accommodating a tool, and wherein a second slot (F) being provided at a
distal end (G) of said second portion (B) to accommodate a spindle of one of
said horizontal boring machine and the drilling machine.