AMontembeault
Mechanical
- May 13, 2014
- 31
Hello everyone
There seems to be some confusion in our design/drafting department regarding the application of scale in drawings.
We know that its generally not a good practice to take a detail view from a section view, however, due to the nature of our product, its often the cleanest and most convenient to accurately define our design intents. The confusion we have is, when performing such an action, how should we relate the scales of the children views?
For example, lets say there is a parent view at 1:1 scale. From that parent view, a section view is taken at 2X scale. From the section, we take a detail view at 2X scale relative to the section view. So, on the drawing, do we define the detail view at 4X scale, relating it to the highest level parent view from which the children views originate, or do we leave it at 2X scale, relating it only to the previous section view with the direct callout?
Possibly complicating this issue - we actually don't specify a real scale on our parent views, so all subsequent view scales are relative, not absolute.
I looked through the Genium drafting manual, and ASME Y14.3, but couldnt find anything really definitive at a quick glance. Looking at Y14.41, it states that section views must be at the same scale as the model (appendix 1 3.4b in the 2012 edition), which would of course mean in the above example 1:1, making a detail view scale 2X anyway you look at it - but often its just not practical to leave our section views at the same scale.
Thoughts?
There seems to be some confusion in our design/drafting department regarding the application of scale in drawings.
We know that its generally not a good practice to take a detail view from a section view, however, due to the nature of our product, its often the cleanest and most convenient to accurately define our design intents. The confusion we have is, when performing such an action, how should we relate the scales of the children views?
For example, lets say there is a parent view at 1:1 scale. From that parent view, a section view is taken at 2X scale. From the section, we take a detail view at 2X scale relative to the section view. So, on the drawing, do we define the detail view at 4X scale, relating it to the highest level parent view from which the children views originate, or do we leave it at 2X scale, relating it only to the previous section view with the direct callout?
Possibly complicating this issue - we actually don't specify a real scale on our parent views, so all subsequent view scales are relative, not absolute.
I looked through the Genium drafting manual, and ASME Y14.3, but couldnt find anything really definitive at a quick glance. Looking at Y14.41, it states that section views must be at the same scale as the model (appendix 1 3.4b in the 2012 edition), which would of course mean in the above example 1:1, making a detail view scale 2X anyway you look at it - but often its just not practical to leave our section views at the same scale.
Thoughts?
