Title: A Fixture for Drilling Holes on Diode Wheel and a Method of
Drilling.
Field of invention:
The invention relates to a method for drilling holes on taper surface in general
and to a fixture for drilling holes on diode wheel and a method for the same; in
particular.
Background & Prior Art:
The existing process has the fol10wing steps:-
Diode Wheel is made out from drawing of forged Ring.
Turning and facing as per drilling requirement is done on centre lathe/CNC
Vertical Boring m/c.
Drilling on 15° Taper face is carried out by Portable Universal Drilling Machine for
Horizontal Boring Machine.
36 holes 029.8mm are drilled one by one by rotating the table if using Portable
Drill Machine and revolving diode wheel on rollers if using Horizontal Boring
Machine.
Process-1
Drilling on the taper of diode wheel were carried out on Horizontal Boring
Machine by clamping diode wheel vertical on a angle plate and supported on
roller for changing position. After setting taper face perpendicular to the
machine spindle one hole is drilled in this position of the wheel and subsequent
change are required for drilling the next hole. Similarly 36 times job setting and
clamping had to be set for drilling all the 36 holes. This is costly and unsafe
process.

Process-2
Portable Universal Drilling Machine was used for drilling of 0 29.8mm holes such
that head of the drilling machine is set on 15° for matching 15° taper on diode
wheel face.
In this machining operation, drilling is done in three steps 1) 010mm 2) 022mm
and 3) finally 0 29.8mm to reduce 10ading on spindle.
36 holes are drilled one by one by rotating the table.
Normally, Universal Drilling machine rest on f10or during drilling operations and
some time machine shifts from the initial position because of vibration due to
high drilling 10ad and as a result of this drill gets broken in the holes.
The process is very inefficient and unproductive.
Object pf invention:
The objects of the invention are to deve10p a device or a fixture and a method to
avoid large costly Horizontal boring machine and a considerable number of
repetition of job settings and clamping for drilling of holes on the diode wheel
particularly holes which are perpendicular to the taper face of the said wheel.
Summary of invention:
The objects are achieved in the present invention by deve10ping a special fixture,
using a radial drilling machine and applying a method with the help of above
items for drilling in diode wheel.
Brief description with the accompanying drawings:
Fig1: Fixture for setting of diode wheel.
Fig2: Details of the components of the fixture in different views.

Detailed description of the invention:
The invention will now be described with help of the accompanying drawings
which depict an exemplary embodiments of the invention. However, there can be
several other embodiments, all of which are deemed covered by the description.
As shown in Fig 1, the fixture (A) for setting a diode wheel and drilling on it
consists of a base plate (7) which is clamped directly on radial drilling machine
bed. A flat plate (6) is fixed with the help of hinges on one side of the base plate
(7). Plate (6) can be moved in vertical plane and can be set and fixed at the
required angles.
A rotary table (2) is mounted on top of plate (6) and rotary table moves in
vertical plane a10ng with plate (6). Four number clamping plates (1) with steps
cut at different heights and diameters are fixed on rotary table. Diameters of
steps are concentric with rotary table. These different steps act as stool for
resting different types of diode wheels while clamping diode wheels on rotary
table.
A handle (3) rotates the rotary table (2) as required. An angle scale (4) is
attached to the base plate (7) for setting the plate (6) at required angle. The
fixture (A) is provided with a jack screw (8) for lifting the unit (2&6) as required
to set the plate(6).
When diode wheel is set & fixed on rotary table, it rests on clamping plate (1)
step and is clamped on rotary table with one centrally 10cated stud-clamp
arrangement. With the help of face screw (8), plate (6) a10ng with rotary table is
moved vertically to bring it at the angle equal to the angle at which taper face is
cut, on this taper face holes of 0 29.8 are marked and are to be drilled
perpendicular to the taper face. This way taper face will be parallel to horizontal
plane and perpendicular to the radial drill machine spindle. First hole is drilled in
this position.

Once a hole is drilled, for setting of position of next hole for drilling, the rotary
table (2) is un10cked for manual rotation and once the 10cation again 10cked to
avoid its movement during drilling operation.
The method of drilling in diode wheel on radial machine by the fixture are as
fol10ws;-
1) Drilling in diode wheel is carried out on radial drilling machine by deve10ping a
fixture. The job is clamped on fixture, in such a way that taper on which drilling
is required to be done remains parallel to the horizontal plane.
2) When base plate, of deve10ped fixture is clamped on M/c base, the top plate is
at 15° to the Horizontal Plane.
3) On Top of the inclined plate rotary table and diode wheel clamping plate are
mounted which can be rotated manually for setting of hole 10cation on diode
wheel.
4) Diode wheel is mounting on clamping plate fixed with rotary table.
5) Holes of 0 29.8mm are directly drilled in diode wheel.
6) For setting of position of next hole for drilling, the rotary table is un10cked for
manual rotation and once the 10cation of hole is fixed, rotary table is again
10cked to avoid its movement during drilling operation.
7) At least 20 nos. of diode wheel are drilled on this fixture successfully on radial
drill machine till date.

Fixing of diode wheel on inclined plane using the fixture for drilling on radial
drilling M/c is an improved method of invention. Clamping plate fixed on rotary
table for mounting of diode wheel is made in steps to fix different size of diode
wheels in firm position for direct drilling of 29.8 mm holes.
Drilling of diode wheel on radial drilling machine by the help of deve10ped fixture
is better substitution as compared to costly Large Horizontal Boring Machine
which are over 10aded and costlier . Whereas Radial Drill machine is 10w cost
machine and highly productive.
Drilling operation as become five times faster than previous method making
better availability of diode wheel for further operation.

We claim
1. The fixture (A) for drilling holes on diode wheel consisting;-
- a base plates (7), clamped on machine base;
- a top plate (6) being set at an inclination eg. 15° to the horizontal plane;
- a rotary table (2) mounted on top of inclined plate (6);
- a plurality of clamping plates (1) in steps fixed on rotary table(2);
- a plurality of clamping stools with clamping plate being used for clamping the
diode wheel tightly;
- a handle (3) to rotate the rotary table (2) for setting the position of the hole to
be drilled;
- a screw jack (8) for lifting and positioning the unit to set the plate (6) a10ng
with Rotary table (2) wherein the drilling of holes on diode wheel with the help
of the said fixture and radial drilling machine eliminates requirement of costly
large horizontal boring machine, and reduces job setting and clamping operation
during drilling as many times as the number of holes to be drilled, to once only
and the drill of desired diameter eg. 29.8 mm is done directly.

2. The fixture as claimed in claim 1, wherein the clamping the diode wheel is
done on fixture, in such a way that taper on which drilling is required, remains
parallel to the horizontal plane.
3. The fixture as claimed in claim 1, the said rotary table (2) is un10cked for
manual rotation for setting of position of the hole and is 10cked after fixing the
10cation of hole to avoid its movement during operation.
4. A method for drilling on diode wheel with the help of the fixture (A) as claimed
in claim 1, comprising;
- drilling in diode wheel on radial drilling machine and the fixture;

- clamping of the diode wheel on the clamping plate (1) fixed with the rotary
table (2) keeping the taper face for example 15°, on which drilling to be done,
remaining parallel to horizontal plane,
- rotating manually the inclined, rotary table (2) with diode wheel clamped on it
for setting of 10cation of hole on diode wheel,
- drilling of holes being done directly to the required diameter for example 29.8
mm,
- un10cking and 10cking of manual rotation mechanism being done to 10cate the
position of next hole to be drilled;
Wherein at least 20 nos. of diode wheel are drilled directly on this method
avoiding drilling done on three steps eg. (1) 10mmdia (2) 22mmdia and finally
diameter of 29.8mm.
5. The method as claimed in claim 4, wherein the clamping plate (1) fixed on
rotary table for mounting of diode wheel is made in steps.
6. The method as claimed in claim 5, wherein the steps on clamping are provided
to fix different size of diode wheels in firm position.
7. The method as claimed in claim 6, wherein said firm position of diode wheels
are required for direct drilling of hole with 29.8mmdia.
8. The method as claimed in claim 1, wherein the diode wheel is machined out
of a forged Ring.
Dated this 16th Day of January 2009.
LS.DAVAR & CO.
APPLICANTS' AGENT

The fixture (A) for drilling holes on diode wheel consisting;-
- a base plates (7), clamped on machine base;
- a top plate (6) being set at an inclination eg. 15° to the horizontal plane;
- a rotary table (2) mounted on top of inclined plate (6);
- a plurality of clamping plates (1) in steps fixed on rotary table(2);
- a plurality of clamping stools with clamping plate being used for clamping the
diode wheel tightly;
- a handle (3) to rotate the rotary table (2) for setting the position of the hole to
be drilled;
- a screw jack (8) for lifting and positioning the unit to set the plate (6) along
with Rotary table (2) wherein the drilling of holes on diode wheel with the help
of the said fixture and radial drilling machine eliminates requirement of costly
large horizontal boring machine, and reduces job setting and clamping operation
during drilling as many times as the number of holes to be drilled, to once only
and the drill of desired diameter eg. 29.8 mm is done directly.