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Horizontal Milling Machines and Accessories

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Horizontal Milling Machines and Accessories Session 12 Horizontal Milling Machines Manufacturing-type Cutter height is controlled by vertical movement of headstock ... – PowerPoint PPT presentation

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Title: Horizontal Milling Machines and Accessories


1
Horizontal Milling Machines and Accessories
  • Session 12

2
Horizontal Milling Machines
  • Manufacturing-type
  • Cutter height is controlled by vertical movement
    of headstock
  • Special-type
  • Designed for specific milling operations
  • Knee-and-column-type
  • Relationship between cutter height and work
    controlled by vertical movement of table

3
Manufacturing-Type
  • Used primarily for quantity production of
    identical parts
  • Distinctive features
  • Automatic cycle of cutter and work approach
  • Rapid movement during non-cutting cycle
  • Automatic spindle stop

4
Manufacturing-Type
  • Two common types
  • Plain manufacturing type
  • Small plain automatic knee and column type

5
Plain Manufacturing Type Milling Machine
6
Special-Type Machines
  • Designed for individual milling operations
  • Used for only one particular type of job
  • Completely automatic
  • Employed when hundreds or thousands of similar
    pieces are to be machined

7
Machining Centers
  • Capable of handling wide variety of work all in
    one setup
  • Straight and contour milling, drilling, reaming,
    tapping, and boring
  • Capable of high production rates while still
    maintaining high degree of accuracy
  • Rugged construction, reliable controls
  • Anti-backlash ball screws

8
Machining Centers
9
Knee-and-Column-Type Milling Machines
  • Machines in this class fall into three
    categories
  • Plain horizontal milling machine
  • Universal horizontal milling machines
  • Vertical milling machines

10
Universal Horizontal Milling Machines
  • Difference from plain horizontal machine is
    addition of table swivel housing
  • Located between table and saddle
  • Permits table to be swiveled 45º in either
    direction in a horizontal plane
  • Used for milling of helical grooves in twist
    drills, milling cutters, and gears

11
Universal Horizontal Milling Machine
12
Milling Machine Parts
  • Base
  • Gives support and rigidity to machine
  • Acts as reservoir for cutting fluids
  • Column face
  • Precision-machined and scraped section used to
    support and guide knee when moved vertically
  • Knee
  • Houses feed mechanism
  • Attached to column face and moved vertically

13
Milling Machine Parts
  • Saddle
  • On top of knee
  • Moved in or out by
  • means of crossfeed
  • handwheel (manually
  • or automatically)
  • Swivel table housing
  • Fastened to saddle on
  • universal milling
  • machine
  • Enables table to be swiveled 45º either side of
    centerline

14
Milling Machine Parts
  • Table
  • Rests on guideways in saddle and travels left and
    right
  • Supports vise and work
  • Crossfeed handwheel
  • Used to move table in and out
  • Table handwheel
  • Used to move table left and right

15
Milling Machine Parts
  • Feed dial
  • Used to regulate table feeds
  • Spindle
  • Provides drive for attachments, arbors, cutters
  • Overarm
  • Provides for correct alignment and support of
    arbor and various attachments
  • Can be adjusted and locked in various positions

16
Milling Machine Parts
  • Arbor support
  • Fitted to overarm and can be clamped
  • Aligns and supports various attachments
  • Elevating screw
  • Gives upward or downward movement to knee and
    table (manually or automatically)
  • Spindle speed dial
  • Set by crank used to regulate spindle speed

17
Backlash Eliminator
  • Eliminates backlash (play) between nut and table
    lead screw
  • Permits operation of climb (down) milling
  • Two independent nuts mounted on lead screw
  • Nuts engage common crown gear which meshes with
    rack
  • Axial movement of rack controlled by backlash
    eliminator engaging knob on front of saddle
  • Turning knob in, nuts forced to move along lead
    screw in opposite directions

18
Machine Backlash Eliminator
19
Milling Machine Accessories
  • Wide variety of accessories greatly increase
    versatility and productivity
  • Accessories classed as fixtures or attachments
  • Work-holding device fastened to table
  • Designed to hold workpieces that cannot be
    readily held in vise or when large quantities are
    to be machined

20
Milling Machine Attachments
  • Designed to hold special attachment that increase
    versatility of machine
  • Vertical, high-speed, universal, rack milling,
    slotting
  • Designed to hold standard cutters
  • Arbors, collets, and adapters
  • Designed to hold workpiece
  • Vise, rotary table, indexing (dividing) head

21
Vertical Milling Attachment
  • Enables plain or universal milling machine to be
    used as a vertical milling machine
  • Mounted on face of column or overarm
  • Angular surfaces made by swiveling head, parallel
    to face of column up to 45º either side of
    vertical
  • Used for face milling, end milling, drilling,
    boring and T-slot milling
  • Universal milling attachment modification allows
    swiveling in two planes for cutting compound
    angles

22
Rack Milling Attachment
  • Used to mill longer gear racks (flat gears) than
    could be cut with standard horizontal milling
    machine
  • Rack indexing attachment included

23
Slotting Attachment
  • Converts rotary motion of spindle into
    reciprocating motion
  • Cutting keyways, splines, templates, and
    irregularly shaped surfaces
  • Length of stroke controlled by adjustable crank
  • Tool slide may be swiveled to any angle in plane
    parallel to face of column

24
Arbors
  • Arbors
  • Used for mounting milling cutter
  • Inserted and held in main spindle by draw bolt
  • Shell-end mill arbors
  • Permit face milling horizontally or vertically
  • Fit into main spindle

25
Collets and Adapters
  • Collet adapters
  • used for mounting drills or other tapered-shank
    tools in main spindle of machine or vertical
    milling attachment
  • Quick-change adapter
  • Mounted in spindle
  • Permits such operations as drilling, boring, and
    milling without change in setup of workpiece

26
Arbors, Collets, and Adapters
27
Milling Machine Vises
  • Plain vise
  • Jaws parallel or 90º to axis of spindle

28
Milling Machine Vises
  • Swivel base vise
  • Can swivel through 360º in horizontal plane

29
Milling Machine Vises
  • Universal vise
  • Can swivel through 360º in horizontal plane and
    tilted from 0º to 90 in vertical plane

30
Fixturing Systems
Easy-to-adjust Stop
31
Indexing or Dividing Head
  • Permits cutting of bolt heads, gear teeth,
    ratchets
  • Revolve work as required to cut helical gears and
    flutes in drills, reamers, and other tools
  • When connected to lead screw of milling machine

32
Horizontal Boring Mill
33
Horizontal Boring Mill
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