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    Drilling and Tapping

    Uploaded by

    Surendra Mallu
    This document provides instructions for drilling and tapping a mild steel workpiece. It describes calculating the tap drill size based on the tap size and pitch. The process involves marking dimensions on the workpiece, drilling pilot holes, and tapping threads into the holes. Drilling requires using the appropriate drill bits while tapping requires inserting the tap into the pre-drilled holes and rotating it clockwise to cut threads into the steel. Dimensional measurements and perpendicularity checks are made during preparation to ensure accuracy.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Drilling and Tapping

    Uploaded by

    Surendra Mallu
    426 views5 pages
    This document provides instructions for drilling and tapping a mild steel workpiece. It describes calculating the tap drill size based on the tap size and pitch. The process involves marking dimensions on the workpiece, drilling pilot holes, and tapping threads into the holes. Drilling requires using the appropriate drill bits while tapping requires inserting the tap into the pre-drilled holes and rotating it clockwise to cut threads into the steel. Dimensional measurements and perpendicularity checks are made during preparation to ensure accuracy.

    Original Title

    DRILLING AND TAPPING

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    © © All Rights Reserved

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    This document provides instructions for drilling and tapping a mild steel workpiece. It describes calculating the tap drill size based on the tap size and pitch. The process involves marking dimensions on the workpiece, drilling pilot holes, and tapping threads into the holes. Drilling requires using the appropriate drill bits while tapping requires inserting the tap into the pre-drilled holes and rotating it clockwise to cut threads into the steel. Dimensional measurements and perpendicularity checks are made during preparation to ensure accuracy.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    426 views5 pages

    Drilling and Tapping

    Uploaded by

    Surendra Mallu
    This document provides instructions for drilling and tapping a mild steel workpiece. It describes calculating the tap drill size based on the tap size and pitch. The process involves marking dimensions on the workpiece, drilling pilot holes, and tapping threads into the holes. Drilling requires using the appropriate drill bits while tapping requires inserting the tap into the pre-drilled holes and rotating it clockwise to cut threads into the steel. Dimensional measurements and perpendicularity checks are made during preparation to ensure accuracy.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
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    DRILLING AND TAPPING

    RAW MATERIAL MARKING AND PUNCHING

    FORMULA
    TAP DRILL SIZE =TAP SIZE PITCH SIZE
    = 10-1.5

    8.5 mm.

    DRILLING OF HOLES

    TAPPING
    ALL DIMENSIONS ARE IN mm.
    DRILLING AND TAPPING

    Exno:
    Date: 2 1/u/21

    Aim:
    To make drill and tap on given mild steel work piece.

    Application:
    Fitting industries, Fasteners industries, Automobile industries

    Supplied Material Specification:


    Mild steel metal plates of dimension is 5Omm x 50mm x ómm

    Tools Required:
    1) Steel rule 2) Try square 3) Jenny caliper 4) 12" Flat rough File 5) Center punch
    6) Bench vice 7) ball peen hammer 8) Drilling M/c 9) 6mm, 8.5 mm 13mm Drill bits
    10) 10 mm X 1.5 mm Hand Tap set 11) Adjustable tap wrench 12) Thread pitch gauge

    Calculation:
    Tap drill size = tap size - pitch size

    = 10 mm - 1.5 mm =8.5 mmn

    Sequence of operation
    1) Preparation 2) Marking 3) Drilling 4) Tapping 5) Finishing
    Working Steps:
    1) Preparation
    a) Check the initial dimensions using steel rule.

    b) Fix the job on a bench vice and file the two adjacent sides using a flat file to formm right angles.
    C) Check for the perpendicularity with try square
    2) Marking:
    work surface.
    a) Apply chalk on the
    from the steel rule.
    b) Measure 20mm using jenny caliper
    12mm.
    measured dimensions to the work piece with edge
    c) Transfer the
    work piece with scriber.
    d) Draw lines along the dimensions on
    center punch.
    e) Make dots inter center point using

    3) Drilling:
    machine platform.
    a) Place the work piece on the drilling
    make two holes on place made by center punch.
    the dotted
    b) Using drilling machine
    the pilot.
    oil for smooth drill and drill the work piece properly by adjusting
    c) Pour some

    better finishing.
    d) Repeat the steps twice for
    the work
    complete the drilling procedure
    on

    e) Lastly go to the thread pitch gauge machine &

    piece
    4) Tapping:
    not
    way that it should
    move.
    a. Fix the work piece in the bench vice in such a

    b. Using Tapping tool 1 make threads in the holes.

    take the taping tool 2 and use it carefully by


    C. Repeat the procedure for both .holes, then
    this process for both holes.
    rotating in clockwise, simultaneously do

    5) Finishing:
    finish.
    a) Using a 10mm screw, check the accuracy of the

    Pre Lab Question:

    1) Define drilling?

    Ans) Deing cutiing froces MaÍ ases


    deIA t to hsla, citeudat
    C 3eiion in selid maltiiols
    2) List out the types of drilling machine?

    Aro)i) LoRa diing marhins


    BenchArillin machin
    (it) elr dilling mahint
    iRdiak s l in machin
    dallins marchint
    Aan
    Mention the type of drilling tool?
    u t d drilk,
    3) aight countes
    c o u n t e r sinr
    Elal bell,
    sink

    Arnd
    Ars) sAlldull,
    Rine ill,
    doill, Tik Aits t c .
    drill, amnR Ait,
    What is mean by tapping? - th
    h saad
    d
    4)
    fio-coss
    Cuii
    uiing a

    he
    Art 9t is
    Ane
    hol.
    he Aheaadd ints h e
    AetCan
    How to calculate tap drill size?
    5)

    Tah bill siz Lnp iz - pith ze


    Artb
    Ars)

    Post Lab Question:

    What is twist drill cutting angle?


    1)

    Ar The angl 32fo peraal uthese.

    Mention the center punch angle?


    2)

    How to hold the drill bit?


    3)
    9rset the daill At into dill cAuwek
    Ar
    Ars)
    Lahten tll chichs sinreral
    times.
    imes Ratte the churk n e k tAe
    hesite
    cich, drill At s lo-cked casely
    indo f a c e .
    the hole diameter
    in drilling process?
    eecods the hole diarete
    measure
    How to
    4)

    Ars
    Ars) A nlipes loz koaded c a l i A e
    asakid asing

    the pitch for tapped holes?


    How do you determine
    5)

    Ar Ptch =af
    Ans) size

    esult:
    The required holes with proper measurements has been obtained
    using Drilling & Taping
    techniques.

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