surprise!

[Jim Hartley]

Went to install axle nut from my damaged landing gear on to the gear I acquired and no go...after about three threads the nut bound. Thought maybe damaged threads,but looked good so chased them with a thread file anyway and still no go, meshed threads from the old gear to replacement gear and found that after about three threads they would no longer mesh. So I have different threads on replacement gear and need a different axle nut.

Both gears have one and one half inch straight axles. My old one has standard Cessna axles. The replacement I do not know and the Gent I bought it from is out of town for a couple more months.

I hope to be flying in a couple more weeks. I will start calling the local guys here shortly.

Any ideas will be appreciated.

Jim

[Jim Hartley]

Re: surprise!

From my research I believe I need a Taylorcraft inch an one half axle nut for the F19 straight axle landing gear. Anyone have one?

Jim

[dejh22]

Re: surprise!

From my research I believe I need a Taylorcraft inch an one half axle nut for the F19 straight axle landing gear. Anyone have one?

Jim

Jim, check with aircraftspruce.com. Maybe they can help?

http://www.aircraftspruce.com/catalog/hapages/axlenuts.php

[Larry Lyons]

Re: surprise!

Also, lay a straight edge across the threads with a white paper laying below. Count the number of crowns, (top part that touches the ruler, in one inch) that will give a T.P.I., threads per inch. When calling looking for new have the outside diameter of the threaded part and along with the thread count you should be able to match up something. Another source may be a company that does drive line repairs and or a transmission shop. Those places are one of the best for larger fine threaded and/or specialty nuts.
Larry

[Jim Hartley]

Re: surprise!

Also, lay a straight edge across the threads with a white paper laying below. Count the number of crowns, (top part that touches the ruler, in one inch) that will give a T.P.I., threads per inch. When calling looking for new have the outside diameter of the threaded part and along with the thread count you should be able to match up something. Another source may be a company that does drive line repairs and or a transmission shop. Those places are one of the best for larger fine threaded and/or specialty nuts.
Larry

I do not have a pitch gauge so a "threads per inch" measurement with a ruler is the "pitch" of the threads? The axle nuts are stocked or categorized by internal diameter and threads per inch or..."pitch"? Correct?

Jim

[mikerice]

Re: surprise!

I visited a salvage yard for aircraft- Air Salvage of Dallas, and they had a box full of axel nuts. They seemed to be mostly 1-1/2" dia. with the same thread pitch, the only variation being the thickness (depth) of the nut. My guess is your nut is not special to F19 gear, and that other suppliers and make/model will work.

[Mark Julicher]

Re: surprise!

I recently worked on a Model 19 axle and discovered the same problem ... the axle nuts were not the same thread pitch as the nuts I bought from Acft Spruce.

[Larry Lyons]

Re: surprise!

Typically the pitch is interpreted to mean TPI but there is a pitch involved in threads to. Sorry, can't help you much there, but the TPI has to be the same irregardless. The pitch and how much of the thread present is another story. There are several types of threads with the same TPI, (think precision fit) that is why over the years I have had my best luck, when on the hunt, at drive line places or transmission rebuild locations. These locations are valuable to if you are looking for different thickness's. Sometimes you can see the difference on the crown, a full crown sharp ^, verses a soft rounded, crown. A rounded crown will usually have a rounded valley too.
Larry

[Dick Smith]

Re: surprise!

Jim, in checking between Wicks Aircraft http://www.wicksaircraft.com/catalog...XRz/index.html and Wag Aero http://store.wagaero.com/product_inf...oducts_id=759I found listings for 1-1/2 x 16 and 1-1/2 x 12 nuts. I would bet that one of these would match...I'm guessing the 1-1/2 x 12. Take a piece of clay and pull an impression from the inside of the nut you have and compare it with the threads on your axle. Dick

[Jim Hartley]

Re: surprise!

Larry the TPI measured at eighteen. I will try the transmission/driveline shops if I can not find the nut at the aircraft supply houses.

Mike, unfortunately we do not have any salvage yards of any substantial size with an inventory like you were at.

Dick I may end up calling them... I tried a piper nut on my old gear axle and it spun right on so it has the same thread as the Cessna nut. I tried it on the new gear leg with the same results. It bound up after about three turns. The threads are clean an true on the axle so buggered threads are not the problem.

Are you still in hawaii? How was the hitching party?

Were all F-19 landing gears originally tapered axles and those with straight axles modified with Cessna/Piper/Maule, etc. axles, hence different axles,threads,nuts?


thanks for the suggestions guys.

Jim

[3Dreaming]

Re: surprise!

I know some of the F-19's came with straight axles.

[Jim Hartley]

Re: surprise!

Walked into the parts store and spotted one lone axle nut with a tag in the display case that said Burl's Aeronca 15 AC series. Spun right on! Search is over!

Thanks for the information guys.

Jim

[Forrest Barber]

Re: surprise!

That is a standard nut , all F-19's are straight axle . The parts book shows only the Taylorcraft Part number #2680 , the tapered axle shows AN320-12 . I will have to check my parts room.