Reference dimension, Assembly drawing and Y14.5 2009
Reference dimension, Assembly drawing and Y14.5 2009
(OP)
In an assembly drawing,
Do you put dimension as REF () or not in an assembly?
In 1.3.24 is clear as what is a reference dimension and it applies to assemblies.
In 1.4o gives an opportunity to leave it without ref but in an assembly this is not a feature but a stack on features.
Most of the assembly drawing I see don't have REF on dimension. It fill the drawing with useless REG or () everywhere except when you localize a part to be fixed (weld, glue, part in slot)
What do you do?
What do you thing you should do?
Robin
Montréal
Do you put dimension as REF () or not in an assembly?
In 1.3.24 is clear as what is a reference dimension and it applies to assemblies.
In 1.4o gives an opportunity to leave it without ref but in an assembly this is not a feature but a stack on features.
Most of the assembly drawing I see don't have REF on dimension. It fill the drawing with useless REG or () everywhere except when you localize a part to be fixed (weld, glue, part in slot)
What do you do?
What do you thing you should do?
Robin
Montréal





RE: Reference dimension, Assembly drawing and Y14.5 2009
"Good to know you got shoes to wear when you find the floor." - Robert Hunter
RE: Reference dimension, Assembly drawing and Y14.5 2009
For instance, it can be useful to have some kind of overall ref dimensions to get a feel for the size of the assembly.
However, I just realized you're specific about 2009 which I don't have.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Reference dimension, Assembly drawing and Y14.5 2009
Your question is "as big as life" with variety of drawings out there.
Say, overall or "envelope" dimensions usually considered not reference, even if they are "self-fulfilling".
Inseparable assemblies are technically assemblies but may contain lot of machining dimensions and be very "part-like".
How about some example?
RE: Reference dimension, Assembly drawing and Y14.5 2009
At the moment, if I feel a need for reference dimensions on my assemblies, I just put them on without the brackets, and without reference to ASME Y14.5. If I need an assembly dimension with tolerances, I reference ASME Y14.5, and I put brackets around any reference dimensions I have provided.
RE: Reference dimension, Assembly drawing and Y14.5 2009
If a dimension is not necessary for that purpose it does not belong on an assembly drawing.
If a dimension cannot be affected by the assembly process it does not belong on an assembly drawing.
RE: Reference dimension, Assembly drawing and Y14.5 2009
Peter Truitt
Minnesota
RE: Reference dimension, Assembly drawing and Y14.5 2009
Marketing needs overall dimension for selling purpose.
Client needs interface dimension (bolt pattern and thread size) and envelope of product.
Production need overall dimension for packaging purpose.
Welding need plates thicknesses to have an idea of weld power.
In common market drawing we never place those brackets since common people have no clue what it is.
In a welding assembly where it is a placement dimension, it is clear that it is not a reference but mandatory.
I use the same cartridge for every drawing so I don't want to remove the 14.5 marking.
There is no policy to work with, I am self employed and look for what we should do but it doesn't seem to be clear.
If I put no dimension on an assembly, people keep coming to ask questions about dimensions for many reasons.
May be there is another standard covering this?
I think I'll keep using brackets.
RE: Reference dimension, Assembly drawing and Y14.5 2009
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Reference dimension, Assembly drawing and Y14.5 2009
Peter Truitt
Minnesota
RE: Reference dimension, Assembly drawing and Y14.5 2009
Y14.100 - 2004 "Engineering Drawing Practices"
Peter Truitt
Minnesota