Portable drilling machines are those which can be used very easily and can drill holes anywhere in the workshop. This type of drilling machine is used for drilling holes on the objects which cannot be moved. Portable drilling machines are operated either by hand power or by engaging a separate motor. All the parts of this drilling machine are small and compact. The motor used here is of universal type that means it can be given either D.C power or A.C. The depth of holes which can be obtained by a portable drilling machine are of range 12mm to 18mm. The width of hole which is obtained through the portable driller is very small in size. High speeds are employed and small drill bits are used. In some cases these drilling machines may also work on pneumatic power.
