Key Tips for Improving Technical Drawing

8 Key Tips for Improving Engineering Drawing.

The following hints will assist the way to enhance your engineering drawing skills. This way, production engineers can without problems recognize the necessities of your additives.

 

Tip 1: Include Dimensions of Only Critical and Measurable Features.

In CNC machining, the 3-D version regularly includes all dimensions wished for production. Therefore, you ought to best encompass crucial threading records and crucial inspection dimensions in your mechanical drawing.

 

Tip 2: Add Hole Tapping Needs to Your Drawing.

It is regularly difficult to degree thread intensity exactly. Therefore, you ought to constantly tread the intensity call-out as a minimum.

 

Tip 3: Consolidate Call-Outs.

If there are multiples of the equal characteristic in a view, deliver a measurement of the best one of these functions. You can then label the measurement as “#X DIM”. This method that the characteristic exists with-inside the view X wide variety of instances. For example, in the “5X 10-38 TAP” method that there are five 10-38 threaded holes in that view.

 

Tip 4: Communicate Assembly Intent of Crucial Features.

If the manufacturing includes the machining of a whole meeting, you ought to encompass a meeting practice on your engineering drawing. Also, you may offer element numbers to your machinists to appearance up. This is specifically vital if you’re putting in off-the-shelf hardware yourself.

 

Tip 5: Part Numbers are Very Important.

In a case in which hardware setup is wished, the dealer and element-wide variety ought to be furnished at the drawing. Just noting “press-healthy M4 dowel” does now no longer deliver fabric records or system store dowel length.

 

Tip 6: No Need to Include Optional Secondary Operation Call-Outs.

For non-crucial operations along with sprucing and anodizing, you may go away from your mechanical drawing. It’s regularly fine to request rates and lead instances for those operations separately. This way, you may understand the extra fee and time. You also can go away the fabric from the drawing if you’re uncertain of the sort of fabric to use. This will assist save you confusion on exceptional levels.

 

Tip 7: Avoid Over-Dimension or Over-Tolerance on Your Designs.

Usually, only a few of the functions of additives are vital to their function. Therefore, you'll need the machinist to recognition greater on those functions. Over-measurement may want to lose crucial functions with-inside the noise. It is, therefore, vital to assign tolerances to best function-crucial functions.

 

Tip 8: Tolerance Must Fall Within Standard Accuracy Levels.

It is vital that you deliver the proper degree of tolerance to your fabric. Do now no longer require tolerance that falls underneath the accuracy abilities of popular hand metrology tools. Therefore, you ought to study the commenced measurements used at your selected system store. This will assist you are making knowledgeable decisions.

 

Conclusion

 

Engineering drawing stays a large issue of a machinist’s job. These drawings make a contribution of as much as 20% of layout work time. This allows us to absolutely seize all of the geometric capabilities of products and their components. That way, you could ensure that producers can produce components that meet precise needs.

At Rapid Direct, we are trying to find to save time with the aid of using automating 3-D model studying for manufacturing purposes. This leaves engineers with the obligation to provide GD&T and meeting drawings only. The intention of this technique is to assist our consciousness of the production of higher products.

We boast strong production talents with offerings in an effort to meet your custom-designed requirements. We assist optimize your component layout and the usage of the maximum sturdy equipment to be had. All you need to do is upload your layout file, and you’ll get an immediate quote. These and lots of greater ones are to be had at competitive prices.

 

Technical Lettering

INTRODUCTION

Technical Lettering is a barren piece of engineering drawing. It gives data concerning measures, and guidelines, as notes and measurements. On a drawing, the entire of the composed data is consistently through lettering. It isn't manually written. Likewise, it very well might be added here, that Lettering is fitting and right words however not (Printing implies the creation of literature on a print machine)

• Lettering

The writing of alphabets and numerals such as A, B, C, D…………………….Z and 1, 2, 3……………9, 0 respectively is called Lettering.

Mainly, there are two types of lettering most commonly used in engineering drawing viz. Gothic Lettering and Roman Lettering.

• Classification Of Lettering
  

The lettering, in general, is classified in two categories :-

1. Gothic Lettering.
2. Roman Lettering.

• Gothic Lettering

Lettering having all the alphabets or numerals of uniform thickness is called Gothic Lettering.

1. Vertical Gothic Lettering
2. Italic or Inclined Gothic Lettering.

• Single Stroke Vertical Gothic Lettering

These are vertical letter having thickness of each line of alphabet or numerals etc. Same as the single stroke of a pencil.Since Stroke means that the letter is written with one or more stems or curves and each made with single stroke.

Single Stroke Vertical Gothic Lettering

• Single Stroke Inclined Gothic Lettering
  

These are single stroke letter inclined at 75' to the Horizontal.

Single Stroke Inclined Gothic Lettering

• Double Stroke Vertical Gothic Lettering

Vertical letter drawn by double Stroke of pencil with uniform thickness between these strokes are called Double Stroke Vertical Gothic Lettering.

Double Stroke Vertical Gothic Lettering

Double Stroke Vertical Gothic Lettering

• Double Stroke Inclined Gothic Lettering

Double stroke gothic when inclined at an angle of 75' is called Double Stroke Inclined Gothic Lettering.

Double Stroke Inclined Gothic Lettering

• Lower Case Vertical Single Stroke Gothic Lettering

Lower case vertical gothic lettering is shown along with its sizes. Which is quite self explanatory.

Lower Case Vertical Single Stroke Gothic Lettering

• Lower Case Vertical Double Stroke Gothic Lettering

It is shown along with its size which is quite self explanatory.

Lower Case Vertical Double Stroke Gothic Lettering

• Lower Case Inclined Single Stroke Gothic Lettering

It is shown with its sizes which is self explanatory.

Lower Case Inclined Single Stroke Gothic Lettering

• Roman Lettering

The lettering in which all the letters are formed by thick and thin elements is called Roman Lettering.

It may be vertical or inclined or inclined. It can be written with a chisel pointed Pencil or D-3 type Speed Ball Pen.

Roman Lettering

• Free Hand Lettering

The writing of alphabets without the use of drawing instruments and in free hand is called Free Hand Lettering.

It may be vertical or Inclined Gothic Lettering.

Free Hand Lettering

Free Hand Lettering

• Mechanical Lettering

In Mechanical Lettering, standard uniform characters that are executed with a special pen held in a scribe and guided by a template. Mechanical lettering does not normally require the use of lettering guidelines. You will use mechanical lettering principally for title blocks and notes on drawings, marginal data for special maps, briefing charts, display charts, graphs, titles on photographs, signs, and any other time that clear, legible, standardized lettering is required. One of the most popular types of mechanical lettering sets is the LEROY lettering set.

The Mechanical Lettering is some times done using special type of device called a Panto-graph.

A PANTO-GRAPH is basically a device consisting of four links which are pinned to each other in a parallelogram fashion. The links can move about the hinge. The lowermost link of the parallelogram is fixed to two rigid supports. One vertical link at one end is connected to a profile tracer which traces the profile of the letter to be drawn and the second vertical link and the other horizontal link are jointly connected to a pencil that draws the exact shape of the profile traced.

• Height Of Lettering

The height "h" of the capital letter is taken as the base of dimension.

The main requirement of lettering on engineering drawing are legibility, uniformity, ease and rapidity in execution.

Both upright and inclined letter are suitable for general use. All letters should be capital, except where lower case letters are accepted internationally for abbreviations.

The recommended size of lettering is as under :-

ITEM	SIZE h, mm
Drawing number in Title Block and letters denoting Cutting Plane Section	10, 12
Title of Drawing	6, 8
Sub-titles and Headings	3, 4, 5, 6,
Notes, such as Legends, Schedules, Material list, Dimension	3, 4, 5
Alteration, Entries and Tolerances	2, 3

• Guide Lines

The light thin lines drawn to obtain uniform and correct height of letters are called Guide Lines.

Guide line should be drawn very light and thin, so that, they need not be erased after the lettering is finished. To erase guide lines after finishing the lettering is not easily possible. Guide line for capital and lower case lettering.

Guide Lines

Guide Lines

•  How To Draw Graph For Lettering

The letters are drawn in a graph. Before drawing the alphabets or numerals of 7:4, 5:4 or any other ratio, a graph is needed.

• First of all take the height of  the lettering and draw two parallel horizontal lines.

Draw Graph For Lettering

• Draw an inclined line at A and mark, 7 or 5 or as required number of vertical squares or rhomboid, parts of any suitable size. Join B1 with B.

Draw Graph For Lettering

• Draw parallel line to B1B from 1, 2, 3, 4, 5, 6 meeting the line AB at A1, A2, A3, A4, A5 and A6.

Draw Graph For Lettering

• From A1, A2, A3, A4, A5 and A6 draw horizontal line.

Draw Graph For Lettering

• From point B draw line at 45' to the horizontal.

Draw Graph For Lettering

• Draw the vertical line for making lines for making squares and inclined line at an angle of 75' for making graph for inclined letters.

Vertical Letters

Inclined Letters

Problems For Practice

1. Rewrite the following in free hand vertical up right printing. Take height of letters = 10 mm. "GROW MORE FOOD"?

2. Print free hand 10 mm height in capital up right letters the following :- DIFFERENT MATERIALS SHOULD BE INDICATED BY NOTES ON DRAWING?

3. Write your name and the name of your institution in free hand single stroke vertical lettering, taking height of letters as 3 mm, 5 mm, 8 mm, 10 mm and 12 mm?

4. Rewrite the following in free hand vertical upright and inclined lettering. I AM PROUD OF MY COUNTRY, take height of letters = 3 mm,4 mm,6 mm, 8 mm and 12 mm?

5. Print the following neatly on the drawing sheet in vertical capital letters free hand only :- GOD HELPS THOSE WHO HELP THEMSELVES?

6. Write alphabets A to Z and numerals 1 to 9 and "0" vertical upright and inclined lettering, free hand, single stroke. Height of letters = 3 mm, 45 mm, 6 mm, 8 mm,10 mm and 12 mm?

7. Draw single stroke vertical capital letters of ratio 7 : 4 and 6 : 5, INDIAN STANDARD INSTITUTIONS?

8. Print the single stroke vertical letters in height 28 mm in 7 : 4 ratio, BUY NATIONAL SAVING CERTIFICATES?

9. Draw double stroke vertical lettering. A to Z ratio = 5 :4, Height =25 mm, ENGINEERING DRAWING? 

Questions For Self Examination

1. What is the purpose of lettering on a drawing sheet?

2. What is the purpose of Guide Line in littering?

3. What is the inclination of inclined lettering?

4. What is the height of lettering for lower case lettering?