Tuesday, March 29, 2011

MILLING OF HEXAGONAL SURFACE

MILLING OF HEXAGONAL SURFACE

AIM :

To machine a given hexagonal surface in a given workpiece using milling machine.

TOOLS AND EQUIPMENTS REQUIRED :

Milling Machine, Vernier caliper, Steel rule, Mandrel

PROCEDURE :

1.    The given workpiece is checked for its dimensions.

2.    The width across the flat is first determined ( Across flat = 1.5 S + 3 mm )

3.    A universal dividing head is mounted on the table with its spindle swiveled to the horizontal position.

4.    The workpiece is mounted at the nose of the dividing head spindle by the help of a suitable chuck.

5.    The workpiece is centred below the cutter and the first cut is taken.

6.    The workpiece is rotated through one sixth of a revolution by using the indexing mechanism and then the second cut is taken. It is to be repeated for six number of times to finish six faces of the workpiece.

RESULT :

Thus the required hexagonal surface is machined using the milling machine to the given dimensions.

CALCULATION :

Diameter, D = 2 x S

Distance across the Flat           =        (1.5 x S) + 3mm

Diameter (D) – Distance across the Flat
Depth of cut                    =        -----------------------------------------------------
2

INDEXING CALCULATION :

For Hexagonal surface, the number of faces, Z = 6.

40
Simple Indexing     =        ----
Z

40
=        ----
6

26
=        6   ----
39