Graphite lead pencils the basic instrument in mechanical drawing
Comes in varying degrees of hardness
Graded in numbers and letters from 6B, very soft and black to 5B, 4B, 3B, 2B, and HB to F the medium grade; then H, 2H, 3H, 4H,5H, 6H, 7H and 8H to 9H, the hardest
The soft (B) grades are used for sketching and rendering hard
Made of clear plastic and come in a variety of symbols ( curves, hexagon, bolt heads, and nuts, circle thread forms, chemical apparatus, electrical symbols, etc. )
2. Always start with very light construction lines and apply the appropriate line weights when you are definite about the figures.
3. Minimize the use of an eraser.
4. Use the dusting brush to remove eraser crumbs and other particles from the drawing surface. Using the palm of the hand, tissue paper, or rags can leave smudges on the surface.
5. Keep a cloth or a piece of clay handy to wife the excess graphite powder from a newly sharpened lead.
Graphite lead pencils the basic instrument in mechanical drawing
Comes in varying degrees of hardness
Graded in numbers and letters from 6B, very soft and black to 5B, 4B, 3B, 2B, and HB to F the medium grade; then H, 2H, 3H, 4H,5H, 6H, 7H and 8H to 9H, the hardest
The soft (B) grades are used for sketching and rendering hard
Made of clear plastic and come in a variety of symbols ( curves, hexagon, bolt heads, and nuts, circle thread forms, chemical apparatus, electrical symbols, etc. )