Screw Drivers

PURPOSE:- 

Screw Driver

To tighten and loosen the screws which have slots in their heads.

1.   Standard screw driver
2.   Cabinet screw driver
3.   Standard with a square tang
4.   Flat blade
5.   Electricians screw driver
6.   Motor mechanics screw driver
7.   Off set screw driver
8.   Philips screw driver( star screw driver)
9.   Retchet screwdriver
10.                     Stubby or close water screw diver
11.                     Watchmaker’s screw driver

            

                           USES

1.   Standard screw driver:

Standard Screw Driver

          This is used for general work some screw drivers of standard neck are made with stronger shank and heavy duty handles and used for heavy duety work.

2.   Cabinet screw driver:-

Cabinet Screw Driver

         The handle of this screw drive is made flat on two sides to get an extra grip.

3.   Standard screw driver with square shank:-

Standard Screw Driver with Square Shank

               The shank of this screw driver is made square so  that wrench can be used for turning the shank to get a greater force.

4.   Flat blade screw driver (London pattern):-

Flat Blade Screw Driver

              The shank of this screw drive is made out of a flat strip and in the shape of a blade to make it longer than the screw slot so thata greater driving force force can be applied. This is mostly used by carpenter’s for driving wood screws.

5.   Electricians Screw driver:-

Electricians Screw Driver

              This screw driver is like a standard screw driver but has a longer shank and it is insulated. It is very useful for driving small screw in electrical appliances.

6.   Motor Mechanic screw driver:-

Motor Mechanics Screw Driver

               This screw driver has a short shank and handle and is used where there is limited space. This shank is flat. It is mostly used by motor mechanics.

7.   Off set screw driver:-

Off Set Screw Driver

                 This screw driver has no handle. It is usually forced out of an octagonal bar and bent on both sides at 90 in opposite direction. Both sides have point that means screw driver flats one of the points is in line with the shank while the other is at 90°. It is used for driving screw which cannot be reached by the straight shank screw driver.

8.   Phillips screw driver:-

Philips Screw Driver

           The tip of this screw driver has cross shaped slots . It figs into the slots of Phillips head screws. This type of screw driver has better grip and prevents damage to the screw head.

      9.Ratchet screw driver:-     

Ratchet Screw Driver

                                                                                                

 Ratchet type of screw drivers are mostly used in production work for fast motion while tightening and loosening screw.

10.Stubby screw driver:-

Stubby Screw Driver

              This screw driver has a very short shank and handle and used where there is limited space mostly by electricians and motor mechanics.

11. Watch maker’s screw driver:-

Watch Makers Screw Driver

      These are small fully metallic screw drivers made in sets of four or six. These are used by watch and instrument repairers.

                                     

                   

MATERIAL OF SCREW DRIVER:-

  Screw drivers are made of high carbon tool steel ot chrome-Vanadium steel. The tips are hardened and tempered to about 52 HRC. (HRC- Hardened Rockwell c-scale)

SIZE OF SCREW DRIVER:-

        The length of the shank is taken as the size of the screw driver. The size of the point depends on the size of the screw for which it is to be used

CARE OF SCREW DRIVER’S:-

1.   The screw driver should not be used as a lever for opening lids of containers.

2.   Do not use the screw driver as a pin punch.

3.   Use the right size screw driver for each screw.

4.   Do not try to loosen or tighten the screws while holding job in the plam.

5.   Do not use the screw driver with oily hands.