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I am trying to draw a fin for my final year project, but I could not fully understand the technical drawing explanations that I marked with red markings.

especially R1.281 DEFINES TANGENCY OF R1.312 WITH FIN SURFACE, I couldn't understand the part. My goal is to make a "bubble fin holder" like in the last picture. I'm also wondering how we can draw this part of fin . high resolution image is here https://i.imgur.com/OmEKV7J.jpeg enter image description here

enter image description here

enter image description here

enter image description here

enter image description here,

enter image description here

https://i.imgur.com/OmEKV7J.jpeg

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  • $\begingroup$ Would be better if you could give higher res picture of the drawing. Its hard to read so your less likely to get answers. Anyway the shae has a 1.312 round $\endgroup$
    – joojaa
    Commented Jul 31, 2022 at 17:31
  • $\begingroup$ @joojaa yeap ı add it as a link,I didn't notice that, thanks for the warning i.imgur.com/OmEKV7J.jpeg $\endgroup$
    – Electronx
    Commented Jul 31, 2022 at 18:11
  • $\begingroup$ Are you asking two questions? 1. What does the original drawing mean? 2. How do I draw the item in the photograph? $\endgroup$
    – Transistor
    Commented Jul 31, 2022 at 20:06
  • $\begingroup$ @Transistor yeap, thats right Im asking two question.My major is electronics, but I know a bit of technical drawing, frankly I didn't understand exactly what drawing meant. The next step is drawing.I was only able to achieve a certain part of the drawing.Solidworks screenshots are mine. $\endgroup$
    – Electronx
    Commented Jul 31, 2022 at 21:50
  • $\begingroup$ I have successfully drawn the leading edge and trailing edge parts of the drawing, but I could not fully understand and draw the part that looks like a buuble, which I marked in "red". $\endgroup$
    – Electronx
    Commented Jul 31, 2022 at 22:19

3 Answers 3

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You can see in the rightmost view of the drawing that the R1.32 does not meet a spherical surface as suggested by Transistor, but in fact meets the vertical extension of the cylindrical surface beneath.

Difference between

The Quickest way to get closer to the drawn geometry (likely within the generous tolerance banding) is to use "Delete and Patch" to simply remove the dome face after you have applied the fillet

Delete Face

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  • $\begingroup$ thank you very much @JonathanRSwift i think this is the most realistic approach. i.imgur.com/tr2hZKk.png but I still don't know how to draw. I need to extrude from 0.65mm base and apply fillet. So what kind of fillet did you apply here? $\endgroup$
    – Electronx
    Commented Aug 2, 2022 at 21:24
  • $\begingroup$ You don't need to start again - just delete this face i.imgur.com/52FcNjf.png from your existing model using the delete and patch option as shown! (Roll back to before the hole in the history tree, though) $\endgroup$
    – Jonathan R Swift
    Commented Aug 3, 2022 at 9:56
  • $\begingroup$ Now I understand, I am truly grateful to you. Thanks thanks thanks. $\endgroup$
    – Electronx
    Commented Aug 3, 2022 at 16:56
  • $\begingroup$ I would like to express your support for me in my article. If you want, please contact me. $\endgroup$
    – Electronx
    Commented Sep 10, 2022 at 14:07
  • $\begingroup$ Hi - there's no need to worry about this - just credit "Jonathan R Swift on StackExchange" if you really want! $\endgroup$
    – Jonathan R Swift
    Commented Sep 12, 2022 at 11:26
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As I commented, I can't make much sense of the original drawing.

Regarding the fin photo, it's not clear from the single photo if the bulbous area is spherical or not. If so then a revolve and fillet might suffice.

enter image description here

enter image description here

Drawings done using OnShape.

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  • $\begingroup$ thanks your effort , thats great $\endgroup$
    – Electronx
    Commented Aug 1, 2022 at 18:04
  • $\begingroup$ I forgot to mention that I drew the sketch for the bulge referenced to the right plane which is the centre of the part. i.e. The top of the spherical part is in the middle of the fin. $\endgroup$
    – Transistor
    Commented Aug 1, 2022 at 18:07
  • $\begingroup$ Do you have a e-mail?I want to show results. $\endgroup$
    – Electronx
    Commented Aug 1, 2022 at 19:58
  • $\begingroup$ Sorry, you'll have to communicate through SE. $\endgroup$
    – Transistor
    Commented Aug 1, 2022 at 21:24
  • $\begingroup$ @electronx - this is incorrect! - I'm just modelling it up myself now, but this does not match the very right hand view $\endgroup$
    – Jonathan R Swift
    Commented Aug 2, 2022 at 10:12
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enter image description here

enter image description here enter image description here

I took the radius of the sphere and added a fillet of 1.312, here is the result

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