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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. PowerPoint to accompany Krar Gill Smid Technology of Machine.

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Presentation on theme: "Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. PowerPoint to accompany Krar Gill Smid Technology of Machine."— Presentation transcript:

1 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. PowerPoint to accompany Krar Gill Smid Technology of Machine Tools 6 th Edition Milling Machine Setups Unit 66

2 66-2 Objectives Mount and remove a milling machine arbor Mount and remove a milling cutter Align the milling machine table and vise

3 66-3 Milling Machine Safety 1.Be sure work and cutter are mounted securely before taking cut 2.Always wear safety glasses 3.When mounting or removing milling cutters, always hold them with cloth to avoid being cut 4.When setting up work, move table as far as possible from cutter to avoid cutting your hands

4 Be sure cutter and machine parts clear work 6.Never attempt to mount, measure, or adjust work until cutter completely stopped 7.Keep hands, brushes, and rags away from revolving milling cutter at all times 8.Do not use an excessively heavy cut or feed Cause cutter to break and fly apart

5 Always use brush, not rag, to remove cuttings after cutter has stopped revolving 10.Never reach over or near revolving cutter Keep hands at least 12 in from revolving cutter 11.Keep floor around machine free from chips, oil, and cutting fluid

6 66-6 Milling Machine Setups 1.Check if machine surface and accessory free from dirt and chips prior to mounting 2.Do not place tools, cutters, or parts on milling machine table 3.Use keys on all but slitting saws when mounting cutters

7 Check that arbor spacers and bushings clean and free from burrs 5.When tightening arbor nut, take care to only hand tighten Hammer or wrench will strip threads and bend or damage accessory or part 6.When mounting work in vise, tighten vise securely by hand and tap into place with lead or soft-faced hammer

8 66-8 Milling Hints 1.Treat milling cutters with care to prevent damage 2.Always examine condition of milling cutter cutting edges before use Replace if necessary, never use dull cutters 3.Use correct speeds and feeds for size of cutter and type of material to be cut 4.For maximum cutter life, use lower cutting speeds and increase feed rate

9 Mount end mills as short as possible to prevent breakage 6.Position arbor supports as close as possible to milling cutters for maximum rigidity 7.Climb mill wherever possible Permits use of higher speeds and improves surface finish Must have backlash eliminator for climb milling 8.Always direct cutting force toward solid part of machine, vise, or fixture

10 Make sure milling cutter rotating in proper direction for cutting action of teeth 10.Use coarse tooth cutters for roughing cuts Provide better chip clearance 11.Stop machine whenever there is discoloration of chips Indicates poor cutting action 12.Use good supply of cutting fluid for all milling operations Prolongs life of cutter

11 66-11 Milling Arbor Used to hold cutter during machine operation Must follow proper procedure of mounting or removing arbor to preserve accuracy of machine –May damage taper surfaces of arbor or machine spindle –Cause arbor to bend –Make cutter run out of true

12 66-12 The Arbor Assembly Milling cutter driven by key that fits into keyways on arbor and cutter –Prevents cutter from turning on arbor Spacer and bearing bushing hole cutter in position Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

13 66-13 Draw-in bar holds arbor firmly in place in the spindle Tapered end of arbor held securely in machine spindle by draw-in bar Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Outer end of arbor assembly supported by bearing bushing and arbor support

14 66-14 To Mount an Arbor 1.Clean tapered hole in spindle and taper on arbor using clean cloth 2.Check for cuttings or burrs in taper 3.Check bearing bushing and remove any burrs 4.Place tapered end of arbor in spindle and align spindle driving lugs with arbor slots 5.Place right hand on draw-in bar and turn thread into arbor approximately 1 in. 6.Tighten draw-in bar lock nut securely against back of spindle

15 66-15 To Remove an Arbor 1.Remove milling machine cutter 2.Loosen lock nut on draw-in bar (2 turns) 3.With soft-faced hammer, sharply strike end of draw-in bar until arbor taper is free 4.With one hand, hold arbor; unscrew draw- in bar from arbor with other hand

16 Carefully remove arbor from tapered spindle to avoid damage to spindle or arbor tapers 6.Leave draw-in bar in spindle for further use 7.Store arbor in suitable rack to prevent being damaged or bent

17 66-17 To Mount a Milling Cutter 1.Remove arbor nut and collar and place them on piece of masonite 2.Clean all spacing collar surfaces of cuttings and burrs 3.Set machine to slowest spindle speed 4.Check direction of arbor rotation by starting and stopping machine spindle 5.Slide spacing collars on arbor to position desired for cutter

18 Fit key into arbor keyway at position where cutter is to be located 7.Hold cutter with cloth and mount it on arbor Cutter teeth point in direction of arbor rotation 8.Slide arbor support in place and check that bearing bushing on arbor 9.Put on additional spacers, leaving room for arbor nut (tighten nut by hand)

19 Lock arbor support in position 11.Tighten arbor nut firmly with wrench, using only hand pressure 12.Lubricate bearing collar in arbor support 13.Make sure arbor and arbor support will clear the work

20 66-20 To Remove a Milling Cutter 1.Be sure arbor support is in place and supporting arbor on bearing bushing before using wrench on arbor nut 2.Clean all cuttings from arbor and cutter 3.Set machine to lowest spindle speed 4.Loosen arbor nut with properly fitting wrench (threads left-hand)

21 Loosen arbor support and remove it from overarm 6.Remove nut, spacers, and cutter 7.Clean spacer and nut surfaces and replace them on arbor –Do NOT use wrench to tighten arbor nut at this time 8.Store cutter in proper place to prevent cutting edges from being damaged

22 66-22 Procedure for Aligning Table on Universal Milling Machine 1.Clean table and face of column thoroughly 2.Mount dial indicator on table by means of magnetic base or any suitable mounting device 3.Move table toward column until dial indicator registers approximately one-quarter of a revolution

23 Set indicator bezel to zero by turning dial 5.Using table feed handwheel, move table along width of the column 6.Note reading on dial indicator and compare to zero reading at other end of column 7.If any movement of indicator hand, loosen locking nuts on swivel table housing

24 Adjust table for half difference of needle movement and lock table housing 9.Recheck table for alignment and adjust until there is no movement in indicator as it is moved along column Note: Always indicate from the table to the face of the column, never from the column to the table.

25 66-25 To Align Vise Parallel to the Table Travel 1.Clean surface of table and base of vise 2.Mount and fasten vise on table 3.Swivel vise until solid jaw approximately parallel with table slots 4.Mount indicator on arbor or cutter 5.Make sure solid jaw is clean and free from burrs

26 Adjust table until indicator registers about one-quarter of a revolution against parallel held between jaws of vise 7.Set bezel to zero 8.Move table along for length of parallel and note reading of indicator Compare to zero reading at other end of parallel 9.Loosen nuts on upper or swivel part of vise

27 Adjust vise to half the difference of indicator readings by tapping it with your hand or with soft-faced hammer in appropriate direction. Note: Never tap the vise so the parallel moves against the indicator plunger 11.Recheck vise for alignment and adjust, if necessary, until no movement in indicator as moved along parallel


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