M20F mixture knob

[David Perry]

Made a mixture knob for an F model. Did not have time to get it anodized but that would really make it look good. 

[carusoam]

Fancy machining skills you got there, David.

Best regards,

-a-

[David Perry]

I did some for a king air and the anodizing really made them look good. 

Now if I could only figure out how to keep the pictures from rotating when I upload them. 

[carusoam]

There are a couple of apps that help with the rotating photos...

a Call to the expert pic helper may work...  @Marauder?

Best rgerads,

-a-

[eman1200]

If you were thinking of doing a red and blue one for the F, I’d be interested!

[David Perry]

I did it to help out a friend. I have the model for the mixture knob saved but not the throttle knob (it was not replaced). 

[Marauder]

Made a mixture knob for an F model. Did not have time to get it anodized but that would really make it look good. 

That looks great! Where were you 3 years ago!

[David Perry]

Not sure about the legality of producing them. The ones I have done so far fall into the category of owner installed parts (one offs). I would think that for any kind of production run some kind of PMA or similar approval would be required. 

I have never tried one of the 3D printing sites. I could make the model available and you could send them the file and see how it comes out. I would still need an old throttle and prop knob to make models of. It would be plastic but better than nothing. 

[Marauder]

Not sure about the legality of producing them. The ones I have done so far fall into the category of owner installed parts (one offs). I would think that for any kind of production run some kind of PMA or similar approval would be required. 
I have never tried one of the 3D printing sites. I could make the model available and you could send them the file and see how it comes out. I would still need an old throttle and prop knob to make models of. It would be plastic but better than nothing. 

I think they fall under the user produced part. If the part is available for purchase then you are obligated to use the correct part. For something that is no longer produced, this is where it gets questionable. If I provide the specifications of the part and have someone make it for me, then I think it is not an intent to sell and doesn’t require a PMA.

21.303 contains the reg. What do you think?


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[Dream to fly]

That is an awesome design...  Sometimes it is better to ask for forgiveness than permission especially when the replacement is thousands of times better.  Back to my cave.

[David Perry]

I read that paragraph. It sounds like I had better not "produce them". 

They do look sweet though. I think I will turn some for my J. Maybe I will make the throttle gold anodized to symbolize pushing money away...

[Marauder]

I read that paragraph. It sounds like I had better not "produce them". 
They do look sweet though. I think I will turn some for my J. Maybe I will make the throttle gold anodized to symbolize pushing money away...

I took the time while here at Sun N Fun to ask a number of true manufacturers their definition of “owner produced parts”. They all said basically the same. If I have a broken part, provided this part with the instruction to duplicate it to someone and they made it for me, it would be considered owner produced. “Owner produced” doesn’t mean I need to make it.

So, if I provide someone my broken part, anyone care to make it?


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[xcrmckenna]

Those look cool!!!! I would gladly break mine if I could get someone to cut me a set. The gold color is a good idea:) I would really like a full set that upgraded my cowl flaps, heater, air vent, and break knob too. But doubt that could be done.


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[Marauder]

Made a mixture knob for an F model. Did not have time to get it anodized but that would really make it look good. 

Bump for another member


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[Hephaestus]

Yeah if @David Perry can put the file up somewhere. I know a guy

Or your local 3d printer (most libraries seem to have one now) can keep it owner supplied.

 But yeah - if someone tosses me dimensions... This took 8 minutes to draw

Edited September 29, 2018 by Hephaestus
Added render

[Jeev]

Real nice work!!!  I would think the local machine shop could make them legally as an owner produced part.

[Hephaestus]

Quote

https://www.google.ca/url?sa=t&source=web&rct=j&url=https://www.savvyaviation.com/wp-content/uploads/articles_eaa/EAA_2011-08_owner-produced-parts.pdf&ved=2ahUKEwiM-czhvOTdAhUWJjQIHbETB0oQFjAAegQIAxAB&usg=AOvVaw0zT2h4Hqm68i4yAuLfyDbL

Byrne explained that it is not necessary for 
the owner to actually manufacture the 
part himself for the part to be considered 
an “owner-produced part.” The owner 
may contract with a mechanic, a repair 
station, or even a non-certifi cated individ-
ual or fi rm (e.g., a machine shop) to 
manufacture the part for him, provided 
that the owner “participated in controlling 
the design, manufacture or quality of the 
part.” The FAA deems the part to be 
owner-produced if the owner does any of 
the following things:
• Provides the manufacturer with design 
or performance data from which to 
manufacture the part—this test would 
be met if the owner provides the manu-
facturer with the old part and asks that 
it be duplicated; or
• Provides materials to make the part; or
• Provides fabrication processes or 
assembly methods to be used in making 
the part; or
• Provides quality control procedures to 
be used in making the part; or
• Supervises the manufacture of the part.
In short, a part whose manufacture is 
contracted by the aircraft owner will qual-
ify as “owner-produced” if the owner 
participates in the production of the part in 
any meaningful way at all.

[/Quote] ??? Ok I give up - quote from faa docs above my comments below.

So you see if one sent a 3D printer outfit a request to

3D print using FDM processes - a knob shaped like <insert picture>

to fit around a lever of these dimensions X Y Z with hole a diameter M" with theads a/b"x 12 on (right/left) side

made in PETG/ABS-FR at 100% infill in ROYGBIV color. 

One would meet owner supplied criteria. I think I've said it before in less direct form

 

Edited October 1, 2018 by Hephaestus
Trying to fix formatting make understandable

[David Perry]

I printed a mixture knob just to see how it would turn out. It would need some wet sanding to get it perfect but I was very happy with the print. It does not compare to the aluminum one but still I was suprised how well it came out.  

(Pink is just what was in the printer)

I put the solid model up on "Thingiverse ". Just search mooney and you will find it. 

[RobertGary1]

On 10/3/2018 at 2:28 PM, David Perry said:

put the solid model up on "Thingiverse ". Just search mooney and you will find it. 

Can you provide a pointer? I didn’t find it. 

-Robert

[Brandontwalker]

https://www.thingiverse.com/thing:3134790


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