Engineering Drawing | Drawing Pencils

in #steemstem5 years ago

This article is all about Drawing pencils.
Logopit_1539017418828.jpg So Drawing are basically used for writing, sketching and all kind of writing purposes. Pencils basically has three main categories:

  1. Conventional Pencils
  2. Mechanical Pencils
  3. Fine lead Mechanical Pencils

Now we will be covering different categories in reverse order:

3. Fine Lead Mechanical Pencils:
It basically a special category for Mechanical Pencils which can't be sharpened further.

mechanical pencil
2. Mechanical Pencils:
It is operated by mechanical mechanism and looks similar any spring operated Pen however it uses 5cm leads of different diameters as it's refill. It is also called Clutch or Automatic Pencil.
Various size of lead available with Mechanical Pencils are 0.3mm, 0.5mm, 0.7mm and 0.9mm.

Note: Lead of one diameter cannot be used in other size of mechanical pencil.

1. Conventional Pencils
This is the most complex and most intresting category of Pencils. It is the same wooden pencil that you might have used in your primary classes. Now a days it comes in various cross section such as circular or triangle but the conventional cross section for any wooden pencil is Hexagon.
It is further categorised as
1.1 Hard Grade
1.2 Medium Grade
1.3 Soft Grade

In total conventional set of Pencils has 18 pencils of different hardness, in which 6 pencils belong to each of three categories as:

Hard Grade9H8H7H6H5H4H
Medium Grade3H2H1HHB1BF
Soft Grade2B3B4B5B6B7B

Diff grade.jpg
In above categories H is for Hard and B is for Bold. So you can easily understand that more H means more hard and less dark pencil whereas, more B means more Dark and less Hard pencil. Using different hardness level of Pencils different shades can be produced.

HB pencils is used for making notes on Drawing Sheet.
H and 2H is used for general Line work.
4H, 5H, 6H is used for construction line work.

The Lead of any pencil is composition of Graphite and Kaolin. Kaolin is a clay like material used for increasing the hardness of the Lead.

Grade Img Credit mechanical pencil credit Cover imgSource

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Helpful post, you covered almost everything.

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Great post!
Thanks for tasting the eden!

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