Subject: Lyc-based-3.17 box
From: rotaryeng
Date: 9/20/2014, 10:09 AM
To: AA-1-Me




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

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