Page 44 - CITS - Fitter - Trade Theory
P. 44

FITTER - CITS
















           Safety precautions

           1  To avoid personal injury maintain a safe distance from the clapping holding tool and work piece.
           2  Where oil and grease are required in the holding device, oil and grease should be applied.
           3  The holding device should be cleaned after use because this working smoothly.


           Introduction to tool holding devices



           Definition – A tool holding device is a device used to securely hold a tool for machining or any other work.
            Types of tool holding device’s
           1  Tool post
           2  Drill holding device
           3  Tap wrench

           Tool post
           The tool post is a lathe part which is seated on the top of the compound slide it holds and supports the tool or tools
           in position closely against the job.

           Types of tool post
           1  Pillar type tool post.
           2  Open side tool post.
           3  Quick Change tool post.

           4  Turret or multi tool post.
           Drill holding devices
           Drill chuck’s
           Taper shank drills with sufficiently large Shank are directly fitted in the tapered hole  of the spindle nose drill check
           is used for holding straight shank drills a drill with tool big taper shank is  held in socket which fits in the tapered
           hole of the spindle.

           A drill chuck is the most popular drill bit holding device in the world. You must have seen one of these in your
           workshops at least if not used one. But here is the truth: When you are working with shank-type drill  bits, drill
           chuck is the holding device you should be using. Because most industrial workers are using it every day.
           Now, to use the drill chuck, you have to fit it into the spindle of the drill machine.
           Drill chuck design
           There are three main components in that drill chuck which you should know: jaws, nut  ring, and key. Most drill
           chucks commonly have three jaws, but some can have four also. But mostly 3 jaw chuck are used by people. And
           these jaws have in-built teeth inside them that strengthen their grip over the drill bit. But when you fit the drill bit
           inside the chuck, you have to use the key to tighten the drill bit properly.







                                                           29

 CITS : CG & M - Fitter - Lesson 4           CITS : CG & M - Fitter - Lesson 4
   39   40   41   42   43   44   45   46   47   48   49