DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
AN APPARATUS FOR DRILLING AND SPOT FACING ON A GAS TURBINE

Applicant:
Mazagon Dock Shipbuilders Limited
A company Incorporated in India under the Companies Act, 1956
Under Ministry of Defence,
(A Govt. of India Undertaking)
Having address:
Dockyard Road, Mazagon,
Mumbai - 400010, Maharashtra, India

The following specification describes the invention and the manner in which it is to be performed.

CROSS-REFERENCE TO RELATED APPLICATION AND PRIORITY

[001] The present application claims priority from Indian Patent application no. (201821043313) filed on 17th November, 2018.

TECHNICAL FIELD
[002] The present subject matter described herein, in general, relates to an apparatus for drilling and spot facing. More particularly, the apparatus further relates to drilling and spot facing of a gas turbine.

BACKGROUND
[003] Generally, for a gas turbine to be installed in a marine-vessel, the gas turbine is aligned and further a bolting plan is marked. Conventionally, when the gas turbine is lowered for the alignment and marking of bolting. Post to that, the process has to undergo several steps like removal of piping, removal of cabling, removal of trunking, positioning of chain blocks, and removal of gas turbine oil tank. In addition, the gas turbine needs to be lifted again to perform the drilling operations. Furthermore, the gas turbine needs to be lowered again, realigned, refitting of removed items, and then the final installation. Thus, increase in time and cost for the implementation, increase in complexity, increase in laborious process.

SUMMARY
[004] Before the present an apparatus for drilling and spot facing on a gas turbine, is described, it is to be understood that this application is not limited to the particular systems, and methodologies described, as there can be multiple possible embodiments, which are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for describing the particular implementations, versions, or embodiments only, and is not intended to limit the scope of the present application.
[005] This summary is provided to introduce aspects related to the apparatus. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.

[006] In one embodiment, an apparatus for drilling and spot facing on a gas turbine is described. The apparatus comprises a machine, a drill bit, and a grinder wheel. Further, the drill bit is coupled to the machine. During operation, the drill bit may drill a hole on a surface of the gas turbine. Furthermore, the grinder wheel is coupled to the machine after removing the drill bit. In addition, further during operation the grinder wheel may spot face the surface of the gas turbine.
BRIEF DESCRIPTION OF THE DRAWINGS
[007] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawings. For the purpose of illustrating of the present subject matter, an example of construction of the present subject matter is provided as figures; however, the invention is not limited to the specific system disclosed in the document and the figures.
[008] The present subject matter is described in detail with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer various features of the present subject matter.

[009] Figure 1 illustrates an apparatus for drilling and spot facing, in accordance with an embodiment of the present subject matter.

[0010] Figure 2 illustrates a drill bit, in accordance with an embodiment of the present subject matter.

[0011] Figure 3 illustrates the apparatus in drilling condition on a gas turbine, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION

[0012] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising," "having," "containing," and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although an apparatus, similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, is now described. The disclosed embodiments for the apparatus is merely example of the disclosure, which may be embodied in various forms.

[0013] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments for the apparatus. However, one of ordinary skill in the art will readily recognize that the present disclosure for the device is not intended to be limited to the embodiments described, but is to be accorded the widest scope consistent with the principles and features described herein.

[0014] In one embodiment, an apparatus for drilling and spot facing on a gas turbine is described. The apparatus comprises a machine, a drill bit, and a grinder wheel. Further, the drill bit is coupled to the machine. During operation, the drill bit may drill a hole on a surface of the gas turbine. Furthermore, the grinder wheel is coupled to the machine after removing the drill bit. In addition, further during operation the grinder wheel may spot face the surface of the gas turbine.
[0015] Now, referring to Figures 1-3, Figure 1 illustrates an apparatus 100 and a grinder wheel 102. Figure 2 illustrates a view 200 of a drill bit 202. Figure 3 illustrates an apparatus 100 in drilling condition 300 on a gas turbine.
[0016] In one embodiment, initially, a lubricant oil system is made ready, post to that, foundation seats are levelled. Further, a gas turbine may be lowered or installed or mounted on the foundation seats. A lifting beam and a plurality of lifting slings may lower the gas turbine. Further, the gas turbine is aligned and the boltholes are marked. Further the apparatus 100 may be used for drilling and spot facing on the gas turbine.

[0017] The apparatus 100 may be a portable device or a handheld device. The apparatus comprises a machine 102, a drill bit 202, and a grinder wheel 104. The drill bit 202 may be coupled to the machine 102. The drill bit 202 may be customized drill bits. The drill bits may be modified to suit or to perform the individual task efficiently. The drill bits may be one of a twist drill, a counter bore, countersink, flat bottom boring, and the like. In one implementation, the machine 102 coupled to the drill bit 202 may drill a hole on a surface of the gas turbine. The surface may comprise a marked hole on the gas turbine.

[0018] The machine 102 may be powered by an electric supply like direct current DC power supply, an alternating current AC power supply, battery and the like. The machine 102 may operate on a motor installed inside, or the machine 102 may operate on the compressed air or may be named as a pneumatic drilling machine.

[0019] The machine 102 may comprise reduction gears in order to adjust the speed of the motor. In one aspect, the machine may comprise a jig or a fixture in order to align the drill bit 202 with the marking of the hole on the gas turbine, thus ease of implementing the drilling operation without any misalignment while operating. In another aspect, a nut and a bolt 204 may be installed into the drilled hole for fixing the gas turbine. The nut may be a check nut. The lock nut may be inserted into the drilled hole by the machine 102. An operator (as shown in figure 3) may implement the drilling operation, when the drill bit 202 is coupled to the machine 102.

[0020] In one another aspect, a bush may inserted into the hole. In yet another aspect, a feed screw may be a drill bit 202 in order to produce threading in the interior parts of the drilled hole.

[0021] In another implementation, for example, the coupled drill bit 202 is removed from the machine 102, and a grinder wheel 104 may be coupled to the machine 102. During operation, the machine 102 coupled with the grinder wheel 104 may be operated to spot face the surface of the gas turbine. Spot facing is the operation of facing the area around the drilled bolt hole and to fit the bolt’s head. Further, to fix the bolt in a predefined position, the machine 102 may insert the lock nut.

[0022] In yet another implementation, the gas turbine comprising an intake port, an exhaust port, a shaft, a thrust block, a Plummer block, and a propeller may be installed into a marine vessel. A gearbox may be coupled to the thrust block. Further, the thrust block may be coupled to the Plummer block. Furthermore the Plummer block may be coupled to the shaft and finally the shaft may be coupled to the propeller. In one another implementation, the gas turbine casing may be implemented as a parallel work activity, thus, reducing time of realignment.

[0023] Exemplary embodiments discussed above may provide advantages, these may include the following.

[0024] Some embodiments of the apparatus reduces time and cost taken for the installation of the gas turbine into the marine vessel.

[0025] Some embodiments of the apparatus eliminates two times lifting and two times lowering of the gas turbine.

[0026] Some embodiments of the apparatus eliminates the process of realignment, refitting of removed items like lubrication oil system or tank, piping systems, and the like, positioning of chain blocks, removal of cabling, removal of piping.

[0027] Some embodiments of the apparatus eliminates complexity and decrease in laborious process.

[0028] Some embodiments of the gas turbine comprising the shaft that connects the gas turbine need not to be removed and reassembled.

[0029] Some embodiments of the fixtures or jigs need not to be removed and then re-fixed.

[0030] Some embodiments of the apparatus eliminates misalignment of the gas turbine.

[0031] Although implementations for the apparatus 100 have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described. Rather, the specific features and methods are disclosed as examples of implementation for the apparatus 100.
,CLAIMS:
1. An apparatus (100) for drilling and spot facing on a gas turbine, the apparatus comprises:
a machine (102);
a drill bit (202), wherein the drill bit (202) is coupled to the machine (100), wherein during operation, the drill bit (202) is configured to drill a hole on a surface of the gas turbine; and
a grinder wheel (104), wherein the grinder wheel (104) is coupled to the machine (100), after removing the drill bit (202), wherein further during operation, the grinder wheel (104) is configured to spot face the surface of the gas turbine.

2. The apparatus (100) as claimed in claim 1, wherein the machine (102) is driven by one of a motor or compressed air.

3. The apparatus (100) as claimed in claim 1, wherein the machine (102) comprises one of a jig or a fixture, wherein the jig or the fixture is configured to align the drill bit (202) with a marking of a hole on the gas turbine.

4. The apparatus (100) as claimed in claim 1, wherein the machine (102) is configured to fasten a lock nut after insertion of a bolt into the hole marked on the surface of the gas turbine.