Horizontal Milling Machines

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Horizontal MillingMachines and

AccessoriesSession 12


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Horizontal Milling

Machines1. Manufacturing-type

Cutter height is controlled by vertical

movement of headstock2. Special-type

Designed for specific milling operations

3. Knee-and-column-type Relationship between cutter height and

work controlled by vertical movement oftable


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Manufacturing-Type

Used primarily for quantity productionof identical parts

Distinctive features

Automatic cycle of cutter and workapproach

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 columntype


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Plain Manufacturing Type

Milling Machine


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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 bemachined


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Machining Centers

Capable of handling wide variety ofwork all in one setup

Straight and contour milling, drilling,

reaming, tapping, and boring

Capable of high production rates whilestill maintaining high degree of accuracy

Rugged construction, reliable controls

Anti-backlash ball screws


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Machining Centers


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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 HorizontalMilling Machines

Difference from plain horizontalmachine is addition of table swivel

housing Located between table and saddle

Permits table to be swiveled 45 in eitherdirection in a horizontal plane

Used for milling of helical grooves intwist 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 forcutting fluids

Column face Precision-machined

and scraped sectionused to support andguide knee whenmoved vertically

Knee Houses feed

mechanism

Attached to columnface and movedvertically


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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 45 either side ofcenterline


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Table

Rests on guidewaysin saddle and travelsleft and right

Supports vise andwork

Crossfeed handwheel

Used to move table

in and out Table handwheel

Used to move tableleft and right


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Feed dial

Used to regulatetable feeds

Spindle

Provides drive forattachments, arbors,cutters

Overarm

Provides for correct

alignment andsupport of arbor andvarious attachments

Can be adjusted andlocked in various

positions


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Arbor support

Fitted to overarm andcan be clamped

Aligns and supports

various attachments Elevating screw

Gives upward ordownward movementto knee and table

(manually orautomatically)

Spindle speed dial Set by crank used to

regulate spindle speed


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Backlash Eliminator

Eliminates backlash (play) between nut andtable lead screw Permits operation of climb (down) milling

Two independent nuts mounted on lead screw

Nuts engage common crown gear which mesheswith rack

Axial movement of rack controlled by backlasheliminator engaging knob on front of saddle

Turning knob in, nuts forced to move along leadscrew in opposite directions


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Machine BacklashEliminator


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Milling MachineAccessories

Wide variety of accessories greatlyincrease versatility and productivity

Accessories classed as fixtures orattachments

Work-holding device fastened to table

Designed to hold workpieces thatcannot be readily held in vise or whenlarge quantities are to be machined


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Milling MachineAttachments

1. Designed to hold special attachment thatincrease versatility of machine

Vertical, high-speed, universal, rackmilling, slotting

2. Designed to hold standard cutters

Arbors, collets, and adapters

3. Designed to hold workpiece Vise, rotary table, indexing (dividing)

head


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Vertical Milling Attachment

Enables plain or universal milling machine tobe 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 45 eitherside of vertical

Used for face milling, end milling, drilling,boring and T-slot milling

Universal milling attachment modificationallows swiveling in two planes for cuttingcompound 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 intoreciprocating motion

Cutting keyways, splines, templates, and

irregularly shaped surfaces

Length of stroke controlled byadjustable crank

Tool slide may be swiveled to any anglein 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 ofworkpiece


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Arbors, Collets, andAdapters


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Milling Machine Vises

Plain vise

Jaws parallel or 90 to axis of spindle


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Swivel base vise

Can swivel through 360 in horizontalplane


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Universal vise

Can swivel through 360 in horizontalplane and tilted from 0 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, gearteeth, ratchets

Revolve work as required to cuthelical gears and flutes in drills,reamers, and other tools

When connected to lead screw of milling

machine


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Horizontal Boring Mill


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Horizontal Boring Mill

Horizontal Milling Machines

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