Interpretation of Isometric Drawing

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Discussion Overview

The discussion revolves around the interpretation and creation of a third angle projection from an isometric drawing, specifically focusing on the placement of a circle with a radius of 25 mm to achieve the correct curvature in the drawing. Participants explore methods for connecting lines to circles in a way that maintains the intended design without awkward transitions.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested, Experimental/applied

Main Points Raised

  • One participant expresses difficulty in positioning a circle of radius 25 mm to achieve the correct curvature in their isometric drawing, noting issues with line connections resulting in awkward transitions.
  • Another participant suggests that the second attempt at the drawing is the closest to the intended design and emphasizes the importance of making the lines tangent to their respective circles.
  • A different participant proposes a traditional method using construction lines to determine the center of the radius, indicating a preference for manual techniques over CAD software.
  • There is a mention of the symmetry of the web concerning a 38 mm diameter hole, suggesting that this aspect should be considered in the drawing interpretation.

Areas of Agreement / Disagreement

Participants have differing views on the correct interpretation of the isometric drawing and the methods to achieve the desired curvature. While some agree on the effectiveness of the second attempt, others suggest alternative approaches, indicating that the discussion remains unresolved with multiple competing views.

Contextual Notes

The location of the R25 is poorly specified in the isometric drawing, which contributes to the challenges faced by participants in achieving the correct projection.

Sirsh
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I am trying to create a third angle projection of this isometric drawing and for the most part it is very straight forward. However, I cannot figure out where to position a 'circle' of radius 25 to give me the correct curvature that is required for this drawing.

Whenever I locate a circle and then try to connect a straight line to it, I get some awkward connection as seen below where it seems like there is a 'jump'.

Here is the isometric drawing that I have (red is the dimension I'm having issues with):
4vfn2b.png


Attempt 1:
Screen_Shot_2016_03_29_at_12_30_07_pm.png


Attempt 2:
Screen_Shot_2016_03_29_at_12_30_31_pm.png


Any help is much appreciated!
 
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Sirsh said:
I am trying to create a third angle projection of this isometric drawing and for the most part it is very straight forward. However, I cannot figure out where to position a 'circle' of radius 25 to give me the correct curvature that is required for this drawing.

Whenever I locate a circle and then try to connect a straight line to it, I get some awkward connection as seen below where it seems like there is a 'jump'.

Here is the isometric drawing that I have (red is the dimension I'm having issues with):
4vfn2b.png


Attempt 1:
Screen_Shot_2016_03_29_at_12_30_07_pm.png


Attempt 2:
Screen_Shot_2016_03_29_at_12_30_31_pm.png


Any help is much appreciated!
I think your Attempt #2 is the closest to what the iso shows.

In drawing the line between the two circles, you want each end of the line to be tangent to its respective circle. Most CAD programs allow you to specify lines in this manner.

You can't do much else with the side view because the R25 location is so poorly specified on the iso.
 
SteamKing said:
I think your Attempt #2 is the closest to what the iso shows.

In drawing the line between the two circles, you want each end of the line to be tangent to its respective circle. Most CAD programs allow you to specify lines in this manner.

You can't do much else with the side view because the R25 location is so poorly specified on the iso.

As always, thank you for your help. I went with drawing #2 as there isn't anyway the other is the correct interpretation of the drawing, in my opinion.
 
The old fashioned way using paper an pencil would be to draw two construction lines parallel to and 25mm away from the lines you are blending together. Where they cross is the centre of the rad.

PS I believe the web should be symmetrical about the 38mm diameter hole as per your second attempt?
 

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