Ralph Hall Posted March 19, 2019 Report Posted March 19, 2019 I’m looking for the red mixture control knob for a 1975 M20F. It seems difficult to find. I have called various bone yards no one seems to have one. I also spoke to Laser they will only sell me the entire assembly for $500. Any ideas? Sent from my iPhone using Tapatalk Quote
Ralph Hall Posted March 19, 2019 Author Report Posted March 19, 2019 Thanks I will send him a message Sent from my iPhone using Tapatalk Quote
Marauder Posted March 19, 2019 Report Posted March 19, 2019 Thanks I will send him a message Sent from my iPhone using Tapatalk Ralph - it can be a user produced part. My mixture knob on my 75F detonated a couple of years back. A machine shop made one up for me in aluminum. If you can find a local machine shop, heck, even a trade school that does CNC machine training might be able to produce one.The knob you are looking for is unique to the 1974 F through the 1977 J models with the quadrant.Sent from my iPad using Tapatalk Pro Quote
Marauder Posted March 19, 2019 Report Posted March 19, 2019 And there is a rumor that Pipers with a quadrant also used them but I was never able to locate one.Sent from my iPad using Tapatalk Pro 1 Quote
Ralph Hall Posted March 19, 2019 Author Report Posted March 19, 2019 Marauder thanks for the help. I will see if I can have a shop cut one out. Thanks Sent from my iPhone using Tapatalk 1 Quote
carusoam Posted March 19, 2019 Report Posted March 19, 2019 There are threads around here that have discussed this before... the search function may find them... MS has a machine shop on record that is good at building aviation knobs... Find David... Best regards, -a- Quote
Hank Posted March 20, 2019 Report Posted March 20, 2019 (edited) 2 hours ago, Marauder said: Ralph - it can be a user produced part. The knob you are looking for is unique to the 1974 F through the 1977 J models with the quadrant. Is it really different from what's in my 1970 C? Looks awfully similar to me . . . @Ralph Hall, do you know anyone with a 3D printer? @Sabremech has done amazing machining / manufacturing of other small parts under the Owner Produced rules. Edited March 20, 2019 by Hank Quote
EricJ Posted March 20, 2019 Report Posted March 20, 2019 (edited) 29 minutes ago, Hank said: @Ralph Hall, do you know anyone with a 3D printer? @Sabremech has done amazing machining / manufacturing of other small parts under the Owner Produced rules. I was going to suggest 3D printing one. If any of your local high schools with a robotics or similar programs has a 3D printer (which they often do), they'll probably be happy to make you one for a little sponsorship money or mentoring time. I judge at FIRST robotics events and the teams print structural parts and all kinds of stuff for their bots. Most of them are quite good at it, and a knob would be a pretty simple project, I'd think, if they had one to make a pattern from. Last week I was at an event in Flagstaff and one of the teams had printed a model of the tournament field and put it on a white board to sort out strategy with alliance teams. Edited March 20, 2019 by EricJ 1 Quote
Ralph Hall Posted March 20, 2019 Author Report Posted March 20, 2019 Thanks Guys. I will look into local 3D printing. Sent from my iPhone using Tapatalk Quote
Robert Hicks Posted March 20, 2019 Report Posted March 20, 2019 https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F261767660292 Quote
Ralph Hall Posted March 20, 2019 Author Report Posted March 20, 2019 Robert Hicks thank you. I just bought it. Sent from my iPhone using Tapatalk 1 Quote
Sime Posted March 20, 2019 Report Posted March 20, 2019 Since you have one side of the knob, you could mould make a mould of that side using modelling clay and then make the new piece with 2 part epoxy. Then just drill a hole for the boss/locator to fit into on the new piece. I'm a spraypainter and own a bodyshop. I painted my prop control knob in blue (was originally black) and the mixture control in red direct gloss 2 pack. A local bodyshop will be able to do the same for you. 1 Quote
carusoam Posted March 20, 2019 Report Posted March 20, 2019 Sime, time to update your avatar pic... Wondering...What does a spray painter’s plane look like??? The Mathematician, Dentist, and 747 driver amongst us have some pretty nice paint schemes... Checkered flags all over their tails... and fancy paint and super high quality finish... Somebody that knows paint systems has got to have something interesting... no? Best regards, -a- Quote
Sime Posted March 22, 2019 Report Posted March 22, 2019 On 3/20/2019 at 1:54 PM, carusoam said: Sime, time to update your avatar pic... Wondering...What does a spray painter’s plane look like??? The Mathematician, Dentist, and 747 driver amongst us have some pretty nice paint schemes... Checkered flags all over their tails... and fancy paint and super high quality finish... Somebody that knows paint systems has got to have something interesting... no? Best regards, -a- The paint on my 76F is a nice scheme, but I must confess I had no hand in it! This is how I purchased her. Unfortunately, at my home airport, hangar space is extremely scarce, so she reluctantly lives outside (with a canopy cover). This photo was taken in January this year: 3 Quote
Yetti Posted March 22, 2019 Report Posted March 22, 2019 If / When my time comes it will probably be solved with a trip to the lathe and the milling machine.... If I could get a cutter small enough, I would go with one piece just cut a slot, drill a hole, run a tap. Paint and be done. Unless I wanted to play with Anodizing. Quote
TTaylor Posted April 7, 2019 Report Posted April 7, 2019 On 3/19/2019 at 7:30 PM, Ralph Hall said: Robert Hicks thank you. I just bought it. Sent from my iPhone using Tapatalk Please let me know how it worked. Mine started falling apart yesterday. Super glued it back together, but likey won't last long. Quote
Guest Posted April 7, 2019 Report Posted April 7, 2019 Wasn't there a member in Western Canada who also machined some for his Mooney? Clarence Quote
Ralph Hall Posted April 10, 2019 Author Report Posted April 10, 2019 The one bought on EBay was not a perfect match. I had to do a few modifications to make it fit. Sent from my iPhone using Tapatalk Quote
JimB Posted April 11, 2019 Report Posted April 11, 2019 You might find this helpful. All three knobs 3D printed in the color of your choice https://www.shapeways.com/product/JMG24VGE8/knob-1?optionId=56118838&li=more-from-shop Quote
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