SCREW

SCREW

• MA=rd/1
• Diameter of screw 5mm common size
• Lead of screw 1mm common size

DIFFERENT TYPES OF SCREWS

• Wood screw
• Sheet metal screws
• Round head screws
• Machine screws
• Lag screws and a few more

MECHANICAL ADVANTAGE

• Win=W out
• W out=Lfout
• The mechanical advantage of a screw depends on its lead
• Smaller the distance between its thread the more advantage it has
• Most screws has a lot of friction causes the advantage to be less

Screw video

http://m.youtube.com/watch?v=3c44hz1WXB8

THE END

USAGE

• Tables
• Beds
• Rails
• Chairs
• Phones and exc.screws are used a lot.