Just general info;

IO 540 prop shaft, star gear input shaft, and 6 planet set at 14# before lightening.

Auto trans Mazda and butchered 540 nose housing at 18#.

Milo

What does it weigh Milo?

Paul Lamar


Hi Milo,
   How did you get those holes through those hardened pins ? spark erosion ? Do you know how long it took to do each hole ?
   Cheers Chris in NZ

Paul,
The shaft and the gearing weighed in at 14 pounds (#).

The flywheel housing and the butchered nose case weighed in at 18 pounds (#), note weight on side of flywheel housing 18#.

Paul, that reminds me we are going to use the 60/45 needled roller bearings you suggested, does it go under the thrust bearing to the thrust shoulder on the shaft? Or vice/verses?

Chris,
I did not observe the spark erosion, the technician said the most difficult part was centering each pin before sparking. However the next time we do one we will try drilling in the vertical mill with carbide, but we anticipate that the pin will rotate and will have to take it to the technician to be sparked.

Milo

Paul,
The shaft and the gearing weighed in at 14 pounds (#).

The flywheel housing and the butchered nose case weighed in at 18 pounds (#), note weight on side of flywheel housing 18#.

Paul, that reminds me we are going to use the 60/45 needled roller bearings you suggested, does it go under the thrust bearing to the thrust shoulder on the shaft? Or vice/verses?

Chris,
I did not observe the spark erosion, the technician said the most difficult part was centering each pin before sparking. However the next time we do one we will try drilling in the vertical mill with carbide, but we anticipate that the pin will rotate and will have to take it to the technician to be sparked.

Milo

I am not sure I follow you. I see no way of using needle bearings in the recycle Lyc PSRU.

RL-PSRU if you like :)

It has to be an oil pressure fed thrust bearing just like the Lyc aircraft engine.
I think you will also need a larger oil pump.

Paul Lamar


Milo,
 Thanks for your reply. Drilling the planet pins with a carbide drill sounds do-able, I have a set of Bad Dog carbide drills that I bought at Oshkosh, I might give it a try, at the moment I'm a bit "chicken". It would seem to me that if the planet pin  turns it should be able to be pressed out as it would have broken the little pin that stops that occurring. The planet pin can then be drilled out in the lathe, does this sound feasible? I see in one of your photos a planet carrier on the bench with the pins out, how did you do this Milo? Press them out, smashing the retaining pins in the process? Or what?
 Cheers Chris.

Are you guys planning on doing this?

Paul Lamar

I have not done it but somebody suggested the best way the get the blind roll pins out is weld a short piece of welding rod to them.
And then pull them out. An Easy Out won't work. The roll pins are too hard.

Believe me we went round and round on this and decided the easy way was EDM. If you do EDM impress upon the shop that does it to put the planet carrier in a bucket of oil immediately (if not sooner) after it finished.
EDM does an excellent job of removing all traces of oil.
If you don't do this the shafts will rust in a matter of seconds.
EDM is done under water.

These planet shafts are worth their weight in gold as they are hardened and ground for the needle bearings.

Worse comes to worse ship it to me Chris and I will get the same shop that did mine do yours.


Paul Lamar

The end of the split pin is flush with the casting, measure the length of the split pin, we know this length because we can see that on the destroyed housing, drill a hole in the housing face just at the end of the pin and force it forward enough to grab a hold of it. The small hole may or may not affect the strength of the housing.

Steve Carlisle, and yes, I have put the body amour ON !



Hi Paul,
   Thanks for the offer to get the planet carrier EDM over there. I have found a shop locally here, we are in discussions as to difficulty and price, can you recall how much it cost you to get it done ?
   Cheers Chris.

It was about $200 as I recall.

Paul Lamar

The Rotary Engine News Letter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net You Tube http://tinyurl.com/beqqxas Copyright 1998-2014 All world wide rights reserved.