Claims:WE CLAIM

1. Machine table mountable work holder for machining of work piece in large size turbogenerator comprising a machine table mountable base plate (10), which is provided with plurality of angle slots (11) along circumferential edges thereof, wherein multitude of upstanding Ribs (13) maintaining a gap there between are radially placed on the base plate (10) so as to support an upper plate (14) for securing the work piece (W).
2. The machine table mountable work holder as claimed in claim 1, wherein the slots are angled that the cutting forces may be absorbed and counter acted by the base plate (10).
3. The machine table mountable work holder as claimed in claim 1 or 2, wherein the base plate (10) is provided with an aperture (12’) so as to accommodate centering cone (12) mounted on machine bed (22) in order to center the base plate as per the machine bed setting.
4. The machine table mountable work holder as claimed in claims 1-3, wherein the plurality of angle slots (11) are provided towards the center of the base plate (10) that fits in T-slot (23) of the machine table/machine bed to restrict the rotary degree of freedom of the holder (F).
5. The machine table mountable work holder as claimed in claims 1-4, wherein the angle slots (11) carry the threaded means (21) therein to threadedly lock the base plate (10) to the machine bed (22), in which by adjusting the height of threaded means in the angle slots (11) of the base plate (10), the angle of the base plate (10) can be adjusted so as to position the work piece at required small angle relative to the machine tool.
6. The machine table mountable work holder as claimed in claims 1-5, wherein the base plate (10) is having steps at the bottom surface so as to allow passage of air during operation.
7. The machine table mountable work holder as claimed in claims 1-6, wherein the height of these ribs (13) can be adjusted as per the ergonomics of the operation.

8. The machine table mountable work holder as claimed in claims 1-7, wherein the stepped upper plate (14) has plurality of threaded holes (18, 19) and slot (17) for attaching the work piece (W), in which the slot includes circular, semicircular shape.
9. The machine table mountable work holder as claimed in claims 1-8, wherein after inserting the work piece (W) in groove (17) of the upper plate (14), a clamp (30) is threadedly used to lock annular member (W) in its recessed location at slot (17), in which said clamp (30) is fastened in a horizontal plane over and across annular member (W) with the help of studs (32), wherein the clamp (30) partially overlaps and rests over protruding part (34) of annular member (W) while the center of said clamp (30) rests on a grub screw (31) threadedly disposed to similar height corresponding to the height of said protruding part (34).
10. The machine table mountable work holder as claimed in claims 1-9, wherein the annular member (W) gets locked so as to position the point and line of machining in the work piece relative to the cutting tool line, whereupon the user then positions and locates the cutting tool relative to the cutting point and line of cutting relative to the annual member (W) and upon having same adjusted properly tightens the threaded means.
, Description:MACHINE TABLE MOUNTABLE WORK HOLDER FOR MACHINING OF WORK PIECE IN LARGE SIZE TURBOGENERATOR

FIELD OF THE INVENTION:
[001] The present invention relates to a universally adjustable work holder for machining of work piece including annular objects such as a drilling tool or slotting tool and which is mountable on a machine table.
[002] Thus, the invention is directed to Machine table mountable work holder for machining of work piece in large size turbogenerator.
BACKGROUND/PRIOR ART OF THE INVENTION:
[003] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[004] Work holders and drill fixtures have been employed heretofore to facilitate the machining of objects at plain and angles. However, several devices of the prior art have not proven entirely satisfactory inasmuch as they are complicated in design and construction, expensive to manufacture, and difficult to use.
[005] As an example, present invention is described for a turbogenerator diode wheel or bearing shell like structures in which plurality of drilling, slotting operations are required.
[006] A generator driven by turbine which is used for conversion of mechanical energy to electrical energy, wherein stator frame, rotor, end shield, seal body are the main components of turbogenerator.
[007] Most important design criteria of a generator are class of insulation used and dissipation of heat generated due to copper loss and core loss. Even class of insulation is based on the heat sustainability of insulation. To improve the heat dissipation, generator is filled either by Hydrogen (higher rating machine)/ Air (Few low rating machine) at more than atmospheric pressure. In most of the machine this pressure is nearly 4 Bar or more.
[008] Bearing Shells being a very critical component of turbo-generator assembly, every dimension of the same is very important for proper functioning of the machine.
[009] Bearing shell is not only responsible for supporting the TG rotor during stationary and running condition, its assembly has significant role in vibrations of the machine. It has oil pockets for jacking and lubrication purposes. Bearing shell has inner lining of soft Babbitt material, softer than the rotor shaft, so as not to damage the rotor shaft during operation.
[010] The assembly is in two halves, and proper machining and assembly of both the halves are very important to have proper oil flow as well as clearances with the rotor shaft during final assembly. These components were machined in two different setting, after marking, on convention machine. Various machining operations done using old process.
[011] Machining operation required to manufacture such a bearing shell are top slot cutting on Plano milling machine, Drilling & counter bore operation on conventional Horizontal Boring Machine & Drill Machine.
[012] Earlier all these machining operations were carried out on different types of conventional machines. The use of conventional machines for marking of holes as well as slot position was carried out before shifting of job for actual machining. It was not only adding to the time required for job completion, but also the chances of human error. Also slot cutting and drilling operation used to be performed on different machines thereby adding to the time cycle of machining in the form of job shifting and job setting.
[013] Machining, which without a proper fixture, is to be done on both the halves separately taking up multiple settings per half of bearing shell not only poses a great threat to the job quality and consumes expensive resources but also makes the job largely dependent of operator’s dexterity in performing multiple job settings and doing the required job setting calculations. One of the challenges with this kind of machining arrangement was mismatch of pitch circle diameter, radial slots and other key design parameters on two halves during assembly. This also increases rejection and indirectly cycle time.
[014] Therefore, a need exists for universally adjustable work holder fixture for machining of annular objects, particularly for jobs like turbogenerator bearing shell or diode wheel that too in minimum possible job settings. Hence, the present invention has been introduced.

OBJECTS OF THE INVENTION:
[015] The object of the present invention is to provide machine table mountable work holder for machining of annular objects which obviates the disadvantages of the known art(s).
[016] Another object of the invention is to provide machine table mountable work holder for machining of annular objects which is simple in construction, easy to use and easy to adjust.
[017] An another object of the invention is to provide machine table mountable work holder for machining of annular objects which is capable of supporting the work piece relative to the cutting tool.
[018] An another object of the invention is to provide machine table mountable work holder for machining of annular objects which can be integrated with any machine bed without major modifications.
[019] Yet another object of the invention is to provide machine table mountable work holder for machining of annular objects which is highly cost effective so that the device of the invention is easily affordable by small shops and individuals.
[020] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.
SUMMARY OF THE INVENTION:
[021] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.
[022] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figure in which like numerals represent like components.
[023] According to the invention, there is provided Machine table mountable work holder for machining of work piece in large size turbogenerator comprising a machine table mountable base plate, which is provided with plurality of angle slots along circumferential edges thereof, wherein multitude of upstanding Ribs maintaining a gap there between are radially placed on the base plate so as to support an upper plate for securing the work piece.
[024] The slots are angled that the cutting forces may be absorbed and counter acted by the base plate.
[025] The base plate is provided with an aperture so as to accommodate centering cone mounted on machine bed 22 in order to center the base plate as per the machine bed setting.
[026] The plurality of angle slots are provided towards the center of the base plate that fits in T-slot of the machine table / machine bed to restrict the rotary degree of freedom of the holder.
[027] The angle slots carry the threaded means therein to threadedly lock the base plate to the machine bed, in which by adjusting the height of threaded means in the angle slots of the base plate, the angle of the base plate can be adjusted so as to position the work piece at required small angle relative to the machine tool.
[028] The base plate is having steps at the bottom surface so as to allow passage of air during operation.
[029] The height of these ribs can be adjusted as per the ergonomics of the operation.
[030] The stepped upper plate has plurality of threaded holes and slot for attaching the work piece, in which the slot includes circular, semicircular shape.
[031] After inserting the work piece in groove of the upper plate, a clamp is threadedly used to lock annular member in its recessed location at slot, in which said clamp is fastened in a horizontal plane over and across annular member with the help of studs, wherein the clamp partially overlaps and rests over protruding part of annular member while the center of said clamp rests on a grub screw threadedly disposed to similar height corresponding to the height of said protruding part.
[032] The annular member gets locked so as to position the point and line of machining in the work piece relative to the cutting tool line, whereupon the user then positions and locates the cutting tool relative to the cutting point and line of cutting relative to the annual member and upon having same adjusted properly tightens the threaded means.
[033] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
[034] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
[035] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein: -
Figure 1 shows: schematic diagram of machine table mountable work holder for machining of annular member in accordance with the present invention.
Figure 2 and 3 shows: exploded view of the present invention.
[036] The figure depicts embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAIL DESCRIPTION OF THE PRESENT INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS OF PREFERRED EMBODIMENTS:
[037] Before describing in detail, universally adjustable work holder and in accordance with the present invention, it should be observed that the present invention resides primarily in a novel and non-obvious combination of hardware elements and method steps. Accordingly, these elements and steps have been represented by conventional elements and steps in the drawings, showing only those specific details that are pertinent to the present invention so as not to obscure the disclosure with details that will be readily apparent to those skilled in the art having the benefit of the description herein.
This invention relates to a technology pertaining to Machine table mountable work holder for machining of work piece including annular members in large size turbogenerator.

[038] Now, reference may be made to Figure 1 and 2, wherein like numerals refer to like and corresponding parts throughout. Here, the work holder (F) is disclosed to illustrate the invention comprising a machine table mountable universally adjustable stepped base plate (10) serving as the base of the holder/fixture (F). The base plate (10) is having steps at the bottom surface (Not Shown) so as to allow passage of air during operation. The plate (10) is provided with plurality of angle slots (11) along its circumferential edges. These slots are angled as per the requirement that the cutting forces may be absorbed and counter acted by the base plate (10).
[039] The base plate (10) is provided with an aperture (12’) so as to accommodate centering cone (12) mounted on machine bed (22) in order to center the base plate as per the machine bed setting. The plurality of angle slots (11) are provided towards the center of the base plate (10) that fits in any standard T-slot (23) of a machine table or the machine bed to further restrict the rotary degree of freedom of the fixture (F). The angle slots (11) carry the threaded means (21) therein to threadedly lock the base plate (10) to the machine bed (22). By adjusting the height of threaded means in the angle slots (11) of the base plate (10), the angle of the base plate (10) can be adjusted so as to position the work piece at any desired small angle relative to the machine tool.
[040] Multitude of upstanding Ribs (13) maintaining a gap there between are radially placed on the base plate (10) so as to support the upper plate (14). The height of these ribs can be suitably adjusted as per the ergonomics of the operation.
[041] The stepped upper plate (14) has plurality of slot (17) having varied diameter and depth. The slot includes circular, semicircular shape without limiting scope of the invention to the same. Thus, any other shape of curve can be included as per the requirement. The slot (17) is used to accommodate annular components viz. the intermediate ring, diode wheel of a turbogenerator exciter, or bearing shell of the turbine bearing or generator bearing. Here, the annular member constitutes work piece (W). However, other than the annular member, any other item can be used as work piece according to the requirement.
[042] Apart from these slots (17), threaded holes (18, 19) are also provided in the upper plate (14) for securing the work piece (W) to the fixture and providing it rigidity. Further fastening points (15, 16) are provided in the form of groove in the circumference of the upper plate (14) as shown in figure 2 so at to clamp the work piece if required.
[043] Upon loosening and detaching the fastener including bolts in threaded hole (18) the work piece can be moved radially clockwise or counterclockwise in order to adjust the angle thereof as desired. For repeated machining requirements, the job can be aligned beforehand so as to minimize or completely eliminate the requirement of measuring angles and repeated settings required thereof.
Operation
Now reference may be made to Figure 5, wherein said annular member (W) is secured to the work holder (F).
During operation, the user radially places the annular member (W) on the upper plate (14) of the holder/fixture (F) such that the annual member (W) fits in slot (17) of the plate (14).
[044] After inserting the annular member (W) in groove (17) of the upper plate (14), clamp (30) is threadedly used to lock annular member (W) in its recessed location at slot (17). The said clamp (30) is fastened in a horizontal plane over and across annular member (W) with the help of studs (32) as shown in figure 3. The clamp (30) partially overlaps and rests over protruding part (34) of annular member (W) while the center of said clamp (30) rests on a grub screw (31) threadedly disposed to similar height corresponding to the height of said protruding part (34). Plurality of studs (31, 32) pass through the clamp (30) and access corresponding threaded holes (18, 19) in upper plate (14) such that tightening of said studs adequately compresses annular member (W) to additionally secure, along recess (17), the said holder (W) from rattling or from vibrations while it is subjected to various machining forces. It is imperative that, the congruent surfaces between annular member (W) and recess (17) be free and clear of debris such as chips or cuttings.
[045] The annular member (W) may reside and get locked so as to position the point and line of machining in the work piece relative to the cutting tool line as desired, whereupon the user then positions and locates the cutting tool relative to the cutting point and line of cutting relative to the annual member W and upon having same adjusted properly tightens the threaded means.
[046] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[047] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[048] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particulars claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B”.
[049] The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[050] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[051] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[052] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.