Selection of Scales for the technical drawings

  • AbhijitN
  • AbhijitN's Avatar Topic Author
  • Offline
  • Elite Member
  • Elite Member
More
10 years 9 months ago - 10 years 9 months ago #8314 by AbhijitN
Who decides upon the choice or options for number of scales to be used?

Here, there is list of standards to be used however; I feel that the scale I want to use is out of the listed one as it fits the best for the combination of sheet I am using.

Here is the list of standard scales,
1:2, 1:5, 1:10, 1:20, 1:50, 1:100, 1:200, 1:500

I am working on a overall plot plan where I need a scale of 1:2000 for A0 size drawing sheet but they say these are the standard scales to be used but I can't...the dwg can't fit in the listed scales....

Now what governs the standardization of scales? Why is the standardization as long as the scales are rounded off to next 50s or 100s scale factor?

Really, not able to understand the fundamental reason behind these standardized scales & the problems. Can anybody answer this?

Please Log in or Create an account to join the conversation.

More
10 years 9 months ago - 10 years 9 months ago #6822 by Jop
You may want to do some research on the web including these:

en.wikipedia.org/wiki/Engineering_drawing

www.eng-tips.com/viewthread.cfm?qid=160902

cad.morainevalley.edu/documents/ ... ndards.pdf

www.slideshare.net/shameem.mist/ ... ng-drawing

All of these and more are available when you Google "ANSI Standard for Drawing Scales"

Do it once and Do it Right

Please Log in or Create an account to join the conversation.

  • AbhijitN
  • AbhijitN's Avatar Topic Author
  • Offline
  • Elite Member
  • Elite Member
More
10 years 9 months ago - 10 years 9 months ago #6825 by AbhijitN
Pls help for better clarity on this....gone through all the links (done Googling before posting the Q) however still a bit of confusion....

Please Log in or Create an account to join the conversation.

More
10 years 9 months ago - 10 years 9 months ago #6826 by Jop
I am not sure I understand your problem. You have specific standard metric drawing sizes and you have specific information you need to present.

Metric Sizes - The ISO A0 size is defined as having an area of one square meter. Each smaller sheet size is exactly half the area of the previous size
• an A0 sheet cut in half gives two A1 sheets
• an A1 sheet in half you get two A2 sheets
Dimensions in millimeters
Sheet Size Sheet Drawing Area Drawing Area
(1)Designation
(2)Paper Height
(3)Paper Width
(4)Drawing Area Height
(5)Drawing Area Width

(1) (2) (3) (4) (5)
AO 841 1189 791 1139
A1 594 841 554 804
A2 420 594 380 554
A3 297 420 267 390
A4 210 297 180 267
A5 148 210 - -
A6 105 148 - -

So you need to fit your image into the Drawing Area (4) x (5)
On a Project, if possible, all drawings of the same type should be the same scale.
Example:
- Overall Plot Plan - There is normally only one so choose a scale that fits the AO drawing area
- Unit Plot Plans - There may be only one or many, so choose one scale that fits so each Unit Plot Plans will fit on the AO drawing area
- Piping Plans & Sections - Choose the area for the piping plans to match your Model sections. Make the scale the same for all Piping Plans & Sections the same.

Do it once and Do it Right

Please Log in or Create an account to join the conversation.

  • AbhijitN
  • AbhijitN's Avatar Topic Author
  • Offline
  • Elite Member
  • Elite Member
More
10 years 9 months ago - 10 years 9 months ago #6827 by AbhijitN
Thanks for your inputs Jop.

Here there is a list of standard scales as below,
1:2, 1:5, 1:10, 1:20, 1:50, 1:100, 1:200, 1:500

They say, I have to use only scales which are listed above however, logically I might need to use scales which are other than the listed once, it can be 1:1000 or 1:300, 1:400 or 1:700 (as in my case) or any other as per the logic you have mentioned "choose a scale appropriately such that fits the AO drawing area".

My question is we can use any scales as per the need & possibly it doesn't need to be only the listed standard once above by them (client).

Do you agree on this?? I would like to explain them if you say YES!

Please Log in or Create an account to join the conversation.

More
10 years 9 months ago - 10 years 9 months ago #6830 by Jop
You wrote: "They say, I have to use only scales which are listed above however...."

Who is "They?
If it is the Client then you better do what "They" say!
If it is the Project Manager or the Construction Manager then you better do what "They" say.

Use one of the established and recognized Scales, do not invent your own odd-ball scale.

Do it once and Do it Right

Please Log in or Create an account to join the conversation.

Moderators: Jop
Time to create page: 0.232 seconds