Which among the following is the purpose for providing bushings in a drill jig ?

For easy drilling

For determining the size of the hole to be drilled

For locating accurately and guiding the drill for precise drilling operation

For getting good finished surface in the drilled holes

Mild steel

Cast iron

Cast steel

Tool steel

Protect the jig from damage

Ensure prolonged life without wear and tear so as to guide the tool accurately

Guide the tool so that it does not go inclined

Allow the chips to come out easily

Vibrate, rotate and be withdrawn while in operation

Rotate when the tool is rotating

Vibrate while in operation

Get withdrawn with the tool

Many holes of various sizes are to be drilled on a jig in different settings

More than one operation has to be performed through the same location of the jig

One operation is to be performed in each hole but several bushings must be used during the life of the jig

No bushing change is required