FIELD OF THE INVENTION
Machining of components mounted on Rotary Table 5 able on Horizontal CNC
Machining center where part is required to be machined at some angle on faces, it
requires complex calculation for X and Z reading. Manual calculation is cumbersome
and time taking and need expertise. New invented procedure for setting angular work
offset eases the calculation and is time saving.
10
BACKGROUND OF THE INVENTION
During planning activity & part program preparation of any component, position of
component is not clear with reference to the machine zero position (Machine Home
Position). For multi face machining operation & machining at indexed position this
15 calculation work becomes very cumbersome. As calculation of work offset for angular
position is very tedious and time consuming it is decided to develop one common
procedure which may result for automatic calculation of work offset irrespective of
positioning of component in any quadrant. Based on machine work offset system, a new
procedure is developed.
20
SUMMARY OF PRESENT INVENTION
In accordance with one aspect of present invention part programmer assumes a
work coordinate system in which the zero point is on the work piece and gives various
25 coordinates at any angular position with respect to this set datum. The floating zero
facility enables the operator to shift the machine zero to coincide with the programmer’s
assumed zero point.
In accordance with second aspect of present invention angular work offset is
calculated for any types of CNC machining center.
30 In accordance with another aspect of present invention work offset for any
component is determined for any CNC machine control system.
In accordance with another aspect of present invention work offset is calculated
for any angular position.
In accordance with another aspect of present invention work offset for any
35 component is determined by less skilled machine operator.
Annexure‐II
BRIEF DESCRIPTION OF THE DRAWINGS
With the help of drawings /sketches the present invention may be well
understood very clearly.
5
Figure/sketch 1: shows the component clamping position at X1, Z1 from machine center.
Figure/sketch 2: shows the component clamping position at X1, Z1 at 90°, 180°& 270°
index angle
Flow chart-1: step by step procedure for angular work offset calculation.
10 DETAIL DESCRIPTION
Part programmer assumes a work coordinate system in which the zero point is
on the work piece and gives various coordinates with respect to this set datum. The
floating zero facility enables the operator to shift the machine zero to coincide with the
15 programmer’s assumed zero point.
Job is mounted at any desired position of work table either on Angle Plate or on
the Raiser Block. Fixtures which are mounted on Raiser Block generally require
centering. This involves much human interference and time consumption. The centering
is done to avoid lengthy and complex calculation required for angular offset
20 determination.
Procedure is capable of calculating the X and Z machine coordinates at any
angular position. Logic and methodology for the same is as per flow chart -1.
The developed procedure is designated as “O” xxxx and fed to the machine.
25 Components are mounted either on angle plate or on rotary plate depending on the
shape, size and machining operation required to be performed.
Procedure is developed considering known zero point on the component. All the
coordinates for machining is calculated considering that zero only. This zero point of the
work is stored in the machine memory. Initial reading in X & Z direction is known point is
30 taken from the Dial gauge / DTI. Incremental distance of that known point with respect to
machine center is calculated. Using trigonometry inclination of that point with respect to
machine center is calculated. This angle is either added or subtracted from the initial
dialed B reading depending on the rotation of desired point either in clock wise or anti
clock wise direction. After finding the new inclination angle, distance component in X
35 direction and distance component in Z direction is determined. This incremental distance
in X and Z direction is added or subtracted depending the desired known point lying in
which quadrant. Absolute value in X and Z are calculated and these values are fed to the
machine as work offset for that face.
For finding the other offset, the above process is repeated for the new angle of
40 inclination and new absolute value in X and Z is calculated through program. In this way
all desired work offset for all faces is calculated and work zero is fed to the machine
registry.

WE CLAIMS:-
Accordingly, the description of the present invention is to be considered as illustrative only and is for the purpose of teaching those skilled in the art of the best mode of carrying out the invention. The details may be varied substantially without departing from the spirit of the invention, and exclusive use of all modifications which are within the scope of the appended claims is reserved. We claim

1. Procedure developed is for automatically calculating angular work offset (X and Z coordinates) at any indexed position of rotary/ angle plate CNC control of horizontal machining center having B as fourth axis.

2. Procedure at claim 1 further elaborate or upgraded for use on other CNC machines like CNC Grinding machine, CNC EDM machine.

3. Procedure as per claim 1, wherein suitable modification lead to use on any two axes (XZ, YZ, and XY) depending on fourth axis configuration of machining center.

4. Procedure as per claim 1, wherein angular work offset is calculated for any types of CNC machining center.

5. Procedure as per claim 1, wherein work offset for any component is determined for any CNC machine control system.

6. Procedure as per claim 1, wherein work offset is calculated for any angular position.

7. Procedure as per claim 1, wherein work offset for any component is determined by less skilled machine operator. ,TagSPECI:As per Annexure-II