Title of Invention

"NOVEL STEADY FOR MACHINING CONICAL COMPONENTS"

Abstract This invention relates to a novel steady for machining conical components in center lathe machines comprising a body (1) having a counter TTore adopted to facilitate filing of taper roller bearing (3), an adjusting ring (4) for keeping the taper bearing in place, a taper brass ring (5) push fitted in taper roller bearing (3) and provided with a screw (6) to facilitate adjustment of the brass ring, a locking plate (2) with locking screws (8) to fix the said taper roller bearing (3) firmly to the said body (1) and clamping plate (7) with bolt (M20) to fix the body onto the lathe machine bed, the said taper brass ring (5) matching with the taper of the work piece being fitted on the taper roller bearing (3) of the steady rotate along with the matching component taper bearing and the work piece to avoid any friction on the job surface.
Full Text This invention relates to a novel steady for machining conical components which is used in center lathe machines and is capable of performing a large number of operations in one setting.
BACKGROUND OF THE INVENTION
In the machine shop practice.it is required to prepare a large number of engineering items having conical, cylindrical, square, hexagonal, needle shapes. Preparation of such items require turning operation on a centre lathe by supporting it on a suitable type of steady.
Steady is used to support long components during turning on lathe machines in order to minimize vibration owing to overhang, thus reducing chattering and making the turning process more convenient. Generally fixed steady, travelling or follower steady, roller steady and revolving steady are useful for cylindrical items while revolving steady is particularly suitable for square/hexagonol work pieces.
The steady as mentioned above are being used for supporting work pieces of cylindrical, hexagonol and square cross sections and are briefly described below:

1. FIXED STEADY; This steady having three brass pads is mounted on the lathe bed, for supporting long cylindrical jobs. This is suitable only for simple cylindrical jobs and cutting speed is always kept low during turning operation.
2. TRAVELLING OR FOLLOWER STEADY; This steady is mounted on the cross slides of lathe machines «, This steady has two brass pads for supporting the job. This steady travels along with the cutting tool, hence the name: travelling/ follower steady.
3. ROLLER STEADY; This steady is generally used on Capstan and turret lathes. This steady has two case hardened rollers mounted on a frame which support the job travel along with the cutting tools.
4- REVOLVING STEADY; This steady is similar to fixed steady except that an additional circular ring is mounted on the jobs which revolves alongwith it. This ring is supported by a fixed steady. This combination is called revolving steady. This is particularly usefule for square/ hexagonal work pieces.

There are disadvantages associated with the present system of steadies.
The main disadvantage with the present system of steadies are that they are ineffective for machining of conical components such as spears or needle shaped stems.
Another disadvantage with the present system of steadies are that they use brass pads for supporting the job which restrict the cutting speed. Also these brass pads wear out over a period of time thus limiting the machining speed during turning.
Yet another disadvantage with the present system of steadies are that the machine speed has to be kept low in order to allow the heat generated due to friction between the job and the steady to dissipate away, This phenomenon
reduces the efficiency of the machine thereby affecting the productivity and the quantity of the job.
Further disadvantages with the present system of travelling steadies which are used mainly to withstand heavy thrust loads imposed by the high speed machining of alloy steels. These steadies are useful in small engineering shops. When grinding or lapping is carried out on the lathes the abrasive materials cause damage to the job surface.

Yet a further disadvantage with the present commercial types of steadies are that they are manufactured as per
bed swing diameter and bed size of lathes. This necessiates frequent changes of the steady to suit job requirement and it becomes necessary to maintain a large inventory of each type of fixed steadies and travelling steadies. This frequent change even increases the inventory cost, labour cost, shop floor time, cost of manufacture, supervision maintenance etc. Besides the setting of the variety of fixed and travelling steadies on a lathe machine often causes inaccuracy in many cases.
SUMMARY OF THE INVENTION
Therefore the main object of the present invention is to propose a novel steady which is capable of performing different types of turning operations on conical components.
Another object of the present invention is to propose a novel steady which is capable of performing different types of turning operations on conical components.
Another object of the present invention is to propose a novel steady which will eliminate the necessity of maintaining a large inventory of each type of steady when conical types of jobs are required to be machined.

Yet another object of the present invention is to propose a novel steady in which the cost of labour, manufacture, supervision and maintenance is effectively reduced.
Still another object of the present invention is to propose a novel steady where the cutting speed and feed can be improved several times.
According to the present invention there is provided a novel steady for machining conical components in center lathe machines comprising a body having a counter bore adopted to facilitate fixing of taper roller bearing, an adjusting ring for keeping the taper bearing in place, a taper brass ring push fitted in taper roller bearing and provided with a screw to facilitate adjustment of the brass ring, a locking plate with locking screws to fix the said taper roller bearing firmly to the said body and clamping plate with bolt to fix the body onto the lathe machine bed, the said taper brass ring matching with the taper of the work piece being fitted on the taper roller bearing of the steady rotate along with the matching component taper bearing and the work piece to avoid any friction on the job surface.
The nature of the invention, its objective and further advantages residing in the same will be apparent from the following embodiments of the invention represented in the accompanying drawings.

Figure 1 shows the front view of the novel steady. Figure 2 shows the side view of the novel steady.
DETAIL DESCRIPTION OF THE INVENTION
With the proposed Novel Steady any type of conical component having any included angle (normally 15 to 90 degree) can be supported with enough stability to achieve a turning speed
of 500 RPM. Many such components can be machined using the
this new steady to obtain a high degree of surface finish
upto 0.8 microns. Since this is an anti-friction device, the chance of ovality, chattering and diamentional inaccuracies are totally eliminated. Apart from improvement in productivity, quality and safety aspects are well taken care. Also efficiency of the machines increase by 500%.
Most of the steadies available till date give rise to friction during roatation which results in wearing out of both job and steady pads. This affects the quality of the job and productivity owing to repeated regrinding of bearing pads.

The Proposed NOVEL STEADY FOR CONICAL COMPONENTS will eliminate both the above short comings, using a suitable Taper Roller Bearing.
COMPONENTS OF NOVEL STEADY
The Novel Steady for Conical Components' has been assembled using the following components.
#1 Body
#2 Locking Plate
•v
#3 Taper Roller Bearing

#4 Adjusting Ring
#5 Taper Brass Ring
#6 Setting Screw
#7 Clamping Plate
#8 Locking Screw

Assembly Of Novel Steady
A Novel Steady for Conical Components primarily comprises of eight components, a body (#1) having a counter bore, said counter bore being adapted to facilitate fixing of taper roller bearing (#3), an adjusting ring, (#4) for
keeping the taper bearing in place, a locking plate (#2)
to lock the said adjusting ring with the help of locking
screw (#8), a taper brass ring (#5) push fitted in taper roller being (#3) and a screw to faciliate adjustment of brass ring as per job diameter. The said taper brass ring (#5) may be selected to match with the requirement of job to be machined on the lathe, the said adjusting ring (#4) having a counter bore so that the outer ring of the said taper roller bearing (#3) is locked and the
said taper brass ring (#5) locks the inner ring of the
said taper roller adjusting, setting screw (#6) being used
for setting of the said steady both longitudinally and heightwise.

The taper brass ring (#5) which matches with taper of the work piece is fitted on taper roller bearing (#3) of the steady. Basically taper roller bearing and taper brass ring work together as a matching component and rotate alongwith die work piece and therefore there is no friction on the surface whereas in the case of conventional steadies friction occurs on job surface.
The taper roller bearing is firmly set with the help of locking plate (#2) and locking screws (#8). Due to this the workpiece is also set alongwith the steady and rotates concentrically. The body (1) is fixed to the lathe machine bed by the clamping plate (7) and bolt (M20).
The invention described hereinabove is in relation to non limiting embodiments and as defined by the accompanying claims.



WE CLAIM :
1. A novel steady for machining conical components in center lathe
machines comprising a body (1) having a counter bore adopted to facilitate
fixing of taper roller bearing (3), an adjusting ring (4) for keeping the taper
bearing in place, a taper brass ring (5) push fitted in taper roller bearing (3)
and provided with a screw (6) to facilitate adjustment of the brass ring, a
locking plate (2) with locking screws (8) to fix the said taper roller bearing
(3) firmly to the said body (1) and clamping plate (7) with bolt (M20) to fix
the body onto the lathe machine bed, the said taper brass ring (5) matching
with the taper of the work piece being fitted on die taper roller bearing (3) of
the steady rotate along with the matching component taper bearing and the
work piece to avoid any friction on the job surface.
2. A novel steady as claimed in claim 1 wherein said adjusting ring (4) has a
counter bore to lock die outer ring of said taper roller bearing (3) and die
said taper brass ring (5) locks to the inner ring of said taper roller bearing
(3).
3. A novel steady as claimed in claim 1 wherein said setting screw (6) is
provided for setting of said steady bolts (M20) longitudinally and vertically.
4. A novel steady as claimed in claim 1 wherein said locking plate (2) is
locked with an Allen screw to prevent the Bearing assembly becoming
loose.
5. A novel steady as claimed in claim 4 wherein the said lock plate is
machined from mild steel plate.

6. A novel steady as claimed in claim 5 wherein said lock plate (2)
has a counter bore on its inside surface to house adjusting ring
(4).
7. A novel steady as claimed in claim 6 wherein an adjusting ring (4)
is interposed between the lock plate (2) and bearing of said body
and the steady of said taper roller bearing (3).
8. A novel steady as claimed in claim 7 wherein said adjusting ring
is made of mild steel.
9. A novel steady for machining conical components substantially
as herein described and illustrated in the accompanying
drawings.

Documents:

1512-DEL-1999-Abstract.pdf

1512-del-1999-claims.pdf

1512-del-1999-correspondence-others.pdf

1512-del-1999-correspondence-po.pdf

1512-del-1999-description (complete).pdf

1512-del-1999-drawings.pdf

1512-del-1999-form-1.pdf

1512-del-1999-form-19.pdf

1512-del-1999-form-2.pdf

1512-del-1999-form-3.pdf

1512-del-1999-gpa.pdf


Patent Number 239364
Indian Patent Application Number 1512/DEL/1999
PG Journal Number 12/2010
Publication Date 19-Mar-2010
Grant Date 16-Mar-2010
Date of Filing 29-Nov-1999
Name of Patentee BHARAT HEAVY ELECTRICALS LTD,
Applicant Address BHEL HOUSE, SIRI FORT, NEW DELHI-110 049, INDIA
Inventors:
# Inventor's Name Inventor's Address
1 BANWARILAL CHOUKSEY BHARAT HEAVY ELECTRICALS LTD, PIPLANI, BHOPAL 462 022, M.P., INDIA
PCT International Classification Number B60L 1/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA