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Discussion in 'Maintenance Bay' started by yhuubert, Jul 13, 2017.
Can you help identify the manufacturer (or exact part no) of this mixture knob:
What is it out of?
If its out of an old Piper it could be anyone from Studebaker to Volkswagon.
Do you need a replacement only for the black plastic bit at the end of the shaft?
Probably anything that fits the same screw will work. A machine shop with a 3D printer could make one to fit the screw.
Somehow I can't open it up The screw just keeps turning around, both when I keep the plastic in place or when that turns also. It's on my Pitts S2, which originally has one without the fine-tuning, which I'd like to keep.
The reason for replacement is that the push-button does not disengage the lock, so currently I can only fine-tune it by turning the knob, which takes ages.
Any recommendations for similar turn + push-button mixture controls, which are good? I assume they are all sold together with cable?
I heard of a titanium door assembly washer that Beech wanted $900 for. They probably need to sell two or three of these every decade, so they don't keep them in stock.
Will we ever be able to make parts like that using a 3d printer, or are 3d printers limited to softer materials, like plastic or nylon?
Surely, a mixture knob could be "printed".
While I know nothing of the regulations in Estonia if the plane is a certified bird a US company named McFarland makes a pma/faa approved vernier mixture replacement cable for the S2A and B.
There is a company in California that is 3d printing Ti parts.
How do you 3D print titanium? I can see plastic and even aluminum, but titanium?
McFarlane (not McFarland) is who I purchased replacement cables and knobs from when I refurbished my airplane. I do recommend them. See website link below.
Get the conditions (pressure, temperature, inert atmosphere) right and they can probably do single crystal work. I am not a metallurgist so just guessing here.
I happen to know someone who's company does this for medical device prototypes(replacement joints,etc.) It's a sintered metal processs when they can deposit small grains of metal precisely and fuse under temperature and pressure. He showed me an eyelid they made for Disney World to replace a broken one in the Pirates of the Carrabeian ride. It's not as strong as a machined part but much quicker and more flexible as to shapes. Pretty cool.
I was watching SuperVet on Netflix where 3D titanium joints for animals was made. It used titanium powder and a laser. Pretty cool.