During filing, sometimes the metal chips (filings) will clog between the teeth of files. This is known as ‘pinning’ of files.
Files which are pinned will produce scratches on the surface being filed, and also will not bite well. Pinning of the files is removed by using a file brush also called a file card, with either forward or backward stroke.
40) File card is used for
Answer is:
Cleaning the file teeth
Explanation:
Related Cutting Tools MCQ - Machinist(Set-1) with Answers
Answer is:
Required to avoid friction between the blade and workpiece
Explanation:
To prevent the hacksaw blade binding when penetrating into the material, and to allow free movement of the blade, the cut is to be broader than the thickness of the hacksaw blade. This is achieved by the setting of the hacksaw teeth. There are two types of hacksaw teeth settings.
Answer is:
5.8 mm
Answer is:
Silicon carbide
Explanation:
In grinding wheel following abrasives are used
The natural abrasives are emery and corrundum,These are impure forms of aluminium oxide.
Artificial abrasives are silicon carbide and aluminium oxide.
Answer is:
Make surface flat so that bolt head can take proper seat on the surface
Explanation:
Spot facing is a machining operation for producing a flat seat for bolt head, washer or nut at the opening of a drilled hole. The tool is called a spot facer or a spot facing tool. Spot facing is similar to counter-boring, except that it is shallower. Tools that are used for counter-boring can be used for spot facing as well.
