is it ok to use scale of 2:3 so that objects can be fit on paper? Beside this i will also write "Do not scale".
Thank you, so i should select scale from this list and use 1:1 scale irespective of Sheet size.
It depends on your company and what standards they adhere to. Since almost no one takes measurements off of mechanical drawings (or their pdf equivalent) these days, the drawing scale is a mute point. (I'm not sure if that is true for architectural and civil drawings though)
I've seen plenty of drawings which use "odd scales". 2:3 is pretty common. I've be a little more hesitant to use something like 7:11, but as long as the scale is identified in the drawing, it really does not matter.
Odd scale sizes often show up in detail views where 2:1 is too large (assuming the drawing is 1:1).
Many drawings are left in electronic format for viewing. Not everyone has the ability or funding to run C, D or E sized prints, but they can view a PDF, then zoom as needed to see details.
Thank You FredSWUG, as you have a lot of experience in designing, could you please tell me How to know if drawing is fully dimensioned ?
Fully-defined sketches' colour turns black...
Drawing (Drafting) not sketches.
I believe the only way is to go back and make the model from the drawings you've made...
*Never heard of a program that checks 2D drawings
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"How to know if drawing is fully dimensioned ?"
first of all: Fully dimensioned is not the same thing as Correctly dimensioned!
A good test to check a fully dimensioned drawing is to try to make the part from the drawing (or try to make a 3D model)
Correctly dimensioned includes much more than just the dimensions; it includes the tolerances, material spec, finish, coatings, etc. The test for a correctly dimensioned drawing is can the part be made? Does it fit with the mating parts? Does it operate correctly? And does it convey the design intent.
I don't know of any easy method to know if a drawing is fully dimensioned. I'd say trying to rebuild the model as Yahya and Jack suggested is the best starting point.
Experience creating parts will also help a lot. You'll be able to see locations which are under defined, or poorly defined (usually requiring you to know the location of some other feature). Experience making drawings is nice, but making parts from drawings will teach you a lot more about where and when certain dimensions and additional views are needed.
On "simple" parts like what are often found in CAD training classes, it is a simple matter to evaluate, or remake a part from a drawing. For many real-world drawings that is a much more difficult task.
You'll often want to work closely with the people who will use the drawing. I've often be lucky in having a machinist in the shops I have worked at. I'd find out how they prefer the drawings to be made, then follow those guidelines.
Some of the main things everyone tended to like in common are:
Thank you, Actually i am a cad engineer at a startup company which makes simple parts like circular cutter, rectangular cutter etc.
But i get a job offer from a tractor manufacturing company. So i am worried how will i dimensions such a complex casting parts.
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