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Milling Machines

Milling Machines. Session 13. Vertical Milling Machine. Developed in 1860's Combines vertical spindle of drill press with longitudinal and traverse movements of milling machine Milling process may be vertical, horizontal, angular, or helical

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Milling Machines

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  1. Milling Machines Session 13

  2. Vertical Milling Machine • Developed in 1860's • Combines vertical spindle of drill press with longitudinal and traverse movements of milling machine • Milling process may be vertical, horizontal, angular, or helical • Can be used for milling, drilling, boring, and reaming • Can machine in one, two, or three planes • X, Y, Z

  3. Vertical Milling Machines • Equipped with variable speed spindles • Permits wide range of speeds • Spindle head housing swiveled as much as 90 degrees right and left, and limited backward and forward for angular operations • Longitudinal and crossfeed movements of table operated by hand or automatic feeds

  4. Face milling End milling Keyway cutting Dovetail cutting T-slot and circular slot cutting Many facing operations done with fly tool Gear cutting Drilling Boring Jig boring Variety of Operations

  5. Types of Vertical Milling Machines • Ram-type • Most common • Features of horizontal milling machine • Cutter spindle mounted in vertical position • Spindle head may be swiveled allowing machining of angular surfaces

  6. Types of Vertical Milling Machines • Ram-type

  7. Parts of Ram-Type Mill • Base • Made of cast iron • May contain coolant reservoir

  8. Parts of Ram-Type Mill • Column • Machined face provides ways for vertical knee movement • Upper part machined to produce turret for overarm mount

  9. Parts of Ram-Type Mill • Overarm • Round base • May be adjusted toward or away from column and rotated • Locked into position

  10. Parts of Ram-Type Mill • Head • Attached to end of ram • Universal-type machines allow swivel in 2 planes

  11. Parts of Ram-Type Mill • Motor • Mounted on top of head • Provides drive to spindle through V-belt

  12. Parts of Ram-Type Mill • Spindle speed • Speed changed by variable-speed pulley/crank or by belt changes and reduction gear

  13. Parts of Ram-Type Mill • Knee • Moves up and down on face of column • Supports saddle and table • Does not contain gears for automatic feed

  14. Heavy-Duty Vertical Milling Machine • Used for machining operations that require larger cutters and good rigidity • Adapted to operations with both end mills and face mills • Profiling interior and exterior surfaces • Milling dies and molds • Locating and boring holes in vises and fixtures

  15. Heavy-Duty Vertical Milling Machine

  16. Horizontal Boring Mill • The Horizontal Boring Mill (HBM) is classically a large machine. Although small items can be machined on them, they are usually reserved for the large to very large workpieces.

  17. Typical Boring Mill Operation

  18. Typical Boring Mill Operation

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