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 Special-type Designed for specific milling operations Knee-and-column-type

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Horizontal milling machines l.jpg
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


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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


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Manufacturing-Type

  • Two common types

    • Plain manufacturing type

    • Small plain automatic knee and column type



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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


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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



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Knee-and-Column-TypeMilling Machines

  • Machines in this class fall into three categories:

    • Plain horizontal milling machine

    • Universal horizontal milling machines

    • Vertical milling machines


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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


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Universal HorizontalMilling Machine


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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


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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


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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


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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


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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


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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



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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


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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


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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


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Rack Milling Attachment

  • Used to mill longer gear racks (flat gears) than could be cut with standard horizontal milling machine

    • Rack indexing attachment included


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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


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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


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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



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Milling Machine Vises

  • Plain vise

    • Jaws parallel or 90º to axis of spindle


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Milling Machine Vises

  • Swivel base vise

    • Can swivel through 360º in horizontal plane


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Milling Machine Vises

  • Universal vise

    • Can swivel through 360º in horizontal plane and tilted from 0º to 90 in vertical plane


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FixturingSystems

Easy-to-adjust Stop


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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




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