Anzani Fan Type 1/4 scale model

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kenr

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The attached pdf file includes 12 pages of drawings to accompany the construction article at Anzani Fan Type 1/4 scale model



Screen Shot 2023-08-02 at 10.02.49 AM.png
 

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  • drawings.pdf
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Thank you for this great contribution! I have always liked this somewhat unusual engine. Is there any chance you'd share a 3D CAD model so that one could apply CAM and CNC the parts amenable to that process?

Oops, now that I took the time to go back the the build article, I see that the model is 2D, so 3D would have to be built before CAM can be done.
 
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I have to comment that on trying to construct this in SolidWorks I have discovered several missing dimensions whilst drawing the crankcase assembly but more so on the crankshaft/flywheel assembly where many details are missing. Photos of the build indicate the crankshafts having some form of locknuts but these details are not on the drawings and the shaft dimensions are vague.
There are also no details of the points for ignition etc so I wonder if I am wasting my time trying to build the 3D model unless I use my own artistic licence.
 

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  • Anzani Crankcase.JPG
    Anzani Crankcase.JPG
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I have to comment that on trying to construct this in SolidWorks I have discovered several missing dimensions whilst drawing the crankcase assembly but more so on the crankshaft/flywheel assembly where many details are missing. Photos of the build indicate the crankshafts having some form of locknuts but these details are not on the drawings and the shaft dimensions are vague.
There are also no details of the points for ignition etc so I wonder if I am wasting my time trying to build the 3D model unless I use my own artistic licence.
Creast: If you would point out missing dimensions as you come across them I'll attempt to update the drawings or publish corrections.

The attached image from the build shows all the crankshaft parts. There are no locknuts. Perhaps the locknuts you see are the collars used in the brazing fixture to clamp the wheels and shafts together.

You are right, the ignition drawing is missing.

I have attached ignition.pdf here. I will attempt to include it in the original post of this thread if possible.
 

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  • crank_parts.jpg
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  • ignition.pdf
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I wonder if I am wasting my time trying to build the 3D model

Creast: Doesn't that depend on your purpose for building the 3D model?

I'm happy you have done this at all and I wonder what your purpose is?

I'm certainly willing to support you with corrections if I can.

Ken
 
I wonder if I am wasting my time trying to build the 3D model

Creast: Doesn't that depend on your purpose for building the 3D model?

I'm happy you have done this at all and I wonder what your purpose is?

I'm certainly willing to support you with corrections if I can.

Ken
Hi Ken,
Thanks for the above information and offer to answer queries, I appreciate that.
I always build a 3D model when working from plans so I can check how everything goes together and moves before actually making one for real and it has proven a good checking tool in the past.
Also, I publish the final 3D model on GrabCad ( Rich Easter | CAD Models | GrabCAD ) to share with others and in addition I produce patterns for casting from the 3D models such as crankcases etc.
Rich
 
Hi Ken,
Thanks for the above information and offer to answer queries, I appreciate that.
I always build a 3D model when working from plans so I can check how everything goes together and moves before actually making one for real and it has proven a good checking tool in the past.
Also, I publish the final 3D model on GrabCad ( Rich Easter | CAD Models | GrabCAD ) to share with others and in addition I produce patterns for casting from the 3D models such as crankcases etc.
Rich
It is gratifying to have someone expand on my work.

Notice that these drawings are copyright under the Creative Commons License 3.0 which includes attribution.
 
It is gratifying to have someone expand on my work.

Notice that these drawings are copyright under the Creative Commons License 3.0 which includes attribution.
Thanks Ken,
When I finally get the model ready for publishing on GrabCad, that's if.. lol, I will consult with you and give credit to you as author of the original design. I will not include your pdf drawings unless approved by yourself.

I only just got your original build thread which explains a lot more, especially that you made the crankshaft one piece which is not obvious on the drawing.
My first query, after trying all manners of how to illustrate them, are basic dims of the shaft as indicated in my jpg.
Cheers
Rich
 

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  • Crank query.jpg
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Distance between the two crank webs will be determinded by the shoulders on the pin so does not need to be put onto the other parts.

Taper on shaft can be worked out from the mating taper in the prop driver.

No doubt I could find more if I went looking for more than the 30 seconds it took to get the above.
 
Distance between the two crank webs will be determinded by the shoulders on the pin so does not need to be put onto the other parts.

Taper on shaft can be worked out from the mating taper in the prop driver.

No doubt I could find more if I went looking for more than the 30 seconds it took to get the above.
Hi Jason.
Thanks for pointing that out.
If you were an engineering workshop you would expect to see each part fully dimensioned and not have to hunt around the drawings translating dimensions.
I fully understand that as hobbyists we don't expect the drawings to include tolerances and we use our judgement.
Rich
 
The attached crankshaft_2.pdf file is updated with the missing dimensions and the as built depiction of the counterweight shape. See .jpg above.

I didn't calculate the crank taper angle. I believe I used a sine bar on the lathe and cut the crank and prop hub tapers at the same setup to be sure they matched.

You may have some interference at the connecting rod relief on the inner side of the wheels in practice.
 

Attachments

  • crankshaft_2.pdf
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The attached crankshaft_2.pdf file is updated with the missing dimensions and the as built depiction of the counterweight shape. See .jpg above.

I didn't calculate the crank taper angle. I believe I used a sine bar on the lathe and cut the crank and prop hub tapers at the same setup to be sure they matched.

You may have some interference at the connecting rod relief on the inner side of the wheels in practice.
Ken,
Thank you for taking the time to do this.
I must say on reading your build log I am extremely impressed with your talent in the the machine shop and I am resisting asking too many questions to avoid swamping or misdirecting the thread as often happens on this forum.
Cheers
Rich
 
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