Work Holding Devices In Milling Machine Pdf Download
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How to Use Work Holding Devices in Milling Machine
Milling machine is a versatile tool that can perform a variety of machining operations on different materials. However, to achieve the desired accuracy and quality of the workpiece, it is essential to use proper work holding devices that can securely hold the workpiece on the milling machine table and prevent any vibration or movement during the cutting process.
In this article, we will discuss some of the common work holding devices that are used for milling machine operations and how to use them effectively.
T-bolts and clamps
T-bolts and clamps are the simplest and most widely used work holding devices for milling machine. They are used to clamp bulky or irregular shaped workpieces directly on the milling machine table by using T-shaped bolts that fit into the T-slots of the table. The clamps have a long hole that allows the adjustment of the bolt according to the size and shape of the workpiece.
To use T-bolts and clamps, first place the workpiece on the table and align it with the desired position. Then insert the T-bolts into the T-slots and tighten them with nuts. Next, place the clamps over the workpiece and secure them with nuts on the T-bolts. Make sure that the clamps do not interfere with the cutter or the feed movement of the table.
Angle plates are used to support workpieces that need to be milled at right angles to another face. They are made of high-quality cast iron that has been stabilized to prevent distortion. They have slotted holes or T-slots on their surfaces that enable the attachment of workpieces or clamps.
To use angle plates, first mount them on the table with T-bolts and nuts. Then place the workpiece on the angle plate and secure it with clamps or bolts. Make sure that the workpiece is square to the table and parallel to the angle plate.
V-blocks are used to hold cylindrical or round workpieces on the milling machine table. They are shaped like a letter V with a groove along their length that can accommodate different diameters of workpieces. They have holes or slots on their base that allow them to be mounted on the table with bolts or clamps.
To use V-blocks, first mount them on the table with bolts or clamps. Then place the workpiece in the groove of the V-block and secure it with a strap clamp or a screw clamp. Make sure that the axis of the workpiece is parallel to the table and perpendicular to the cutter.
Machine vices are used to hold small or medium-sized workpieces on the milling machine table. They are similar to bench vices but have a swivel base that can be rotated and locked in any position. They have jaws that can grip different shapes of workpieces with a screw mechanism.
To use machine vices, first mount them on
the table with bolts or clamps. Then place
the workpiece between the jaws and tighten
the screw until it is firmly held. Make sure
that the workpiece is aligned with
the cutter and does not overhang
Dividing head is a special device that is used
to divide a circle or a cylindrical workpiece
into equal parts or angles. It consists of a
headstock, a tailstock, an index plate, a crank
handle, and a worm gear mechanism. It can
be mounted on either end of
the table or on an angle plate.
To use dividing head, first mount it on
the table or an angle plate with bolts or
clamps. Then attach
the workpiece to
the headstock spindle with a chuck or a faceplate.
Next, select an index plate that has
the required number of holes for
the division required.
Then insert an index pin into one of
the holes and lock it with a spring clip.
the crank handle by a certain number of turns or fractions of turns according to
the division required.