Vertical milling machines combine the vertical spindle of a drill press with the longitudinal and transverse movements of a milling machine, allowing them to mill in one, two, or three axes. They are equipped with variable speed spindles and can perform operations like face milling, end milling, keyway cutting, dovetail cutting, drilling, boring, and more. The ram-type vertical milling machine is the most common type and consists of a base, column, overarm, head, motor, knee, and spindle. Horizontal boring mills are large machines typically used for machining large workpieces.

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. Variety of Operations 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

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