Maintenance of Machine tools - PowerPoint PPT Presentation

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Maintenance of Machine tools

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Title: Maintenance of Machine tools


1
Maintenance of Machine tools
Prepared By Dr.K.Elangovan
Nizwa College of Technology
2
Maintenance of Machine tools
  • Objective
  • Equipments and machine tools are very
  • important component of production activity
  • Break down of machines resulted in reduced
    production and it will be great loss
  • It is very important to maintain machine tools to
    minimize loss and to improve the production

3
Maintenance
  • Definition
  • Maintenance is the process of keeping the
    machine and equipment in good working condition
    so that the efficiency
  • and life of the machine is increased
  • Advantages of good maintenance
  • Increased life of the machine
  • Ensured quality of the product
  • No production loss
  • Machinery is not damaged
  • Disadvantages of bad maintenance
  • Loss of production
  • More wastage of material
  • Reduced life
  • Leads to accidents
  • Cost of production is increased

4
Lathe maintenance
  • The lathe is a precision machine tool and
    must be treated with great care. Regular cleaning
    and maintenance will help to assure that the
    lathe will maintain its service life and accuracy
    for many years
  • Lathe maintenance involves maintenance of
  • Drive belts
  • Gib Adjustment( cross slide, Compound slide)
  • Wipers Pads
  • Adjusting the Tailstock Clamp

5
Drive belts

Removal of guard
Checking belt Tension
6
Adjusting belt tension
  • Drive belts come in matched sets and should only
    be replaced with a matched set of belts.
  • Visually inspect the drive belts for excessive
    wear and cracking.
  • If you notice that one or more of the drive belts
    appear to be excessively worn replace it with new
    one
  • Check the belt tension by applying finger
    pressure to each belt at a point midway between
    the two pulleys
  • For correct tension a deflection of about 6-8mm
    should be evident in each belt.
  • If the amount of deflection is more than 6-8mm in
    any one or more of the belts adjust it with belt
    tensioner

7
Gib Adjustment
  • All lathes employ precision slide ways.
  • The saddle, cross slide, and the compound slide
    all ride along a box slide way or dovetail slide
    way
  • After time the parts that ride along the slide
    ways begin to wear
  • To compensate for this wear, machine tools are
    equipped with adjustable parts called gibs that
    allow you to eliminate the space that has been
    created by the wear between the slide ways

8
Gib Adjustment
Cross slide (Tapered Gib)
9
Gib Adjustment Procedure
  • The procedure is to first loosen the similar gib
    screw in the rear face of the tool slide
  • Then re-tighten the front screw to lock or
    adjust the Gib in its new position
  • After making the adjustment, traverse the
    compound slide over its entire travel to be sure
    of smooth, even operation

10
Cross slide (Tapered Gib)
Front gib screw
Tapered gib with screws
11
Compound slide (straight Gib)
  • There are two types of gibs, straight gibs and
    tapered gibs
  • Straight gibs are adjusted by screws spaced out
    along the length of the gib.
  • The screws push the gib in to create more contact
    with the sliding mechanisms

12
Wipers Pads
13
Wipers Pads
  • Wipers are designed to keep out small chips and
    dirt between the slides and the ways.
  • Wipers are saturated with oil to catch the fine
    particles of dirt or debris before they get
    between the two sliding surfaces.
  • The wipers should be removed, cleaned, and
    re-saturated with oil regularly.
  • Never use compressed air for cleaning a lathe
    Compressed air will push the fine particles
    trapped in the wiper between the mating surfaces
    of the slides, causing premature wear on these
    precision surfaces

14
Scheduled maintenance
  • Maintenance carried out in accordance with the
    schedule defined by the manufacturer of the
    machine
  • Usually carried out in predetermined dates
  • It involves inspection, Cleaning, lubrication,
    repairing and replacing the parts of the machine
    as per the recommendations of the manufacturer

15
Scheduled maintenance- Lathe
  • Daily
  • - Cleaning chips from carriage, cross slide,
    compound rest and bed
  • - Check the head stock oil level through
    inspection glass
  • Weekly
  • -Check auto drain on filter regulator
  • -Clean out small chip catch pan in coolant tank
  • Monthly
  • -Lubricate the way covers
  • -Remove pump from coolant tank and clean it
  • -Check the gear box oil level, top up if
    necessary
  • Six months
  • -Remove the coolant and thoroughly clean the
    coolant tank
  • -Replace the hydraulic unit oil filter
  • - Check all hoses and lubrication lines for
    cracking
  • Annually
  • -Replace gear box oil
  • -Check and replace drive belts
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