Drawing Instruments, Pencils & its Grades

Drawing Instruments, Pencils & its Grades 

What is meant by mini drafter?

It is an engineering device, is used to draw a line at an any angle. It is the combination function's of set square’s, T-square, protractor, scale. 

(Example: Nearly 50% and 30% time to save to draw a architectural & machine drawings respectively).

Why pencil is rotated in finger while drawing a long line?

The pencil is rotated in finger while drawing a long line in order to get a line of uniform thickness throughout.

What should be the grade of pencil used for lettering?

HB and H grade pencils sharpened to a conical point should be used for lettering. To keep the stroke of the letters uniform, the pencils should be rotated between the thumb and fingers while lettering. Hard pencils such as 2H or 3H should be used to draw guidelines.

What are the ways of sharpening a pencil for good and accurate work and which type of pencil is more suitable for drawing work?

There are two ways of sharpening a pencil (i) a small piece of sand paper of zero grade, pasted upon a piece of wood. (ii) Sharpeners. Usually hard pencils such as H, 2H etc are used for making the engineering drawing.

Why cello-tape is used instead of drawing pins, now a day?

Now a days, cello tapes are used in place of drawing pins for its practical convenience as the drafter and set-squares can be moved easily over the tape.

What is the necessity of folding a drawing print?

Folding marks are made on the sheet to facilitate folding of prints for the purposes of filing and binding in the proper and easy manner.

Composed by:  R.Satheesh, M.E., Asst Prof., email: rsatheeshemail@gmail.com.