The attachment is essentially made up of right-angle gear mechanisms that transfer power from the milling machine’s spindle to a vertical spindle with no change in speed.
To temporarily convert a horizontal spindle, a vertical milling attachment or swivel attachment is used.
The attachment is bolted to the machine’s column and is sometimes supported by the overarm.
For machining angular surfaces, the head of the attachment with the spindle can be swiveled about an axis parallel to the milling machine spindle.
UniversalHead Milling Attachment
This attachment is superior to the vertical milling attachment in that the cutting spindle axis can be swiveled around an axis parallel to the milling machine’s axis as well as an axis at right angles to it.
This allows for cutting at almost any angle.
The speed of the universal head milling spindle can be equal to or greater than that of the milling machine spindle.
Normally, the attachment is supported by the overarm.
High SpeedMilling Attachment:
This attachment is similar to a universal head milling attachment in construction, but it includes a gearbox that allows the spindle to run at 4 to 6 times the spindle speed.
This attachment is required when using small diameter cutters such as end mills, which would otherwise operate at extremely low surface speeds due to their small diameters.
An eccentric or a crank housed within the attachment converts the rotary motion of the machine spindle into the reciprocating motion of a ram.
The attachment is bolted to the column’s face and supported by the overarm.
For machining at an angle, the ram and its slide can be swiveled about an axis parallel to the milling machine spindle.
The ram’s stroke length can also be adjusted. This attachment is useful for machining internal and external keyways as well as die-making.
This attachment is used for machining rack teeth and is made up of a gear train that allows the milling machine spindle’s axis to be oriented at right angles in a horizontal plane.
To position the job under the cutter for successive teeth, a rack indexing attachment is used.
When mounted on a universal milling machine, the attachment allows for the machining of slanted or skew rack teeth by swivelling the table at the required helix angle.
A work holding device is a rotary table or circular milling attachment. It is bolted to the milling machine table and provides rotary motion to the workpiece in addition to the machine’s normal longitudinal, transverse, and vertical motions. The attachment consists of a circular table that is rotated about a vertical axis by a worm and worm wheel arrangement. The worm wheel attached to the rotary vertical table shaft meshes with a worm attached to a horizontal shaft. The horizontal worm shaft can be tuned manually or powered by connecting it to the table feed drive mechanism.
The angle turned is measured using a micrometer dial or an index plate supplied with the rotary table. The rotary table’s rotary motion allows for the cutting of partial or complete circles. Profiles of any complex contour can be machined using a suitable combination of rotary and linear motions. The index plate is used to mill evenly spaced grooves or slots around the outside of a workpiece.
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