Lubricant

[jtroutt19]

Originally Posted by jharkin

I'mnot getting into the oil vs. grease debate for radial bearings again.

Yes I am not wanting this either. Just want to see what people use.

Me personally on my other RC stuff have always used a lightweight oil on anything that slides(metal on metal) For bearings I will repack them with a little bit of good quality grease and thats that until it decide to service them.

[Four Stroker]

Thank you gharkin ! I have thrown away 3 BLS254 servos BECAUSE the STEEL motor shaft seized in the BRASS motor bearing UNDER THE CIRCUIT BOARD. Oilite Bronze would have been a better choice for a motor bearing in a $140 servo.

[amphibia]

Originally Posted by Four Stroker

Thank you gharkin ! I have thrown away 3 BLS254 servos BECAUSE the STEEL motor shaft seized in the BRASS motor bearing UNDER THE CIRCUIT BOARD. Oilite Bronze would have been a better choice for a motor bearing in a $140 servo.

May I learn more about how you oil the bronze sleeve bearing on the futaba brushless servo motor?

- the top bronze sleeve bearing is easily accessible under the pinion gear. I can add oil to that sleeve bearing easily.

- the bottom bronze sleeve bearing is blocked by the circuit board. The motor is soldered the circuit board and glued to the middle section of the servo. I know this because I broke open a used BLS351 servo. It had an intermittent screaming noise. The local futaba service center told me the motor was done and wanted 60 dollars to replace the motor. I couldn't justify the payment so I poked around myself. I screwed up and pulled the motor wires off and ruined it but I didnt see any non-invasive way to get to the bottom bearing.


So how did you lube/maintain it without breaking it? I have more than 12 futaba brushless servos. I could really use some help.

Thanks

[amphibia]

Originally Posted by Four Stroker

Thank you gharkin ! I have thrown away 3 BLS254 servos BECAUSE the STEEL motor shaft seized in the BRASS motor bearing UNDER THE CIRCUIT BOARD. Oilite Bronze would have been a better choice for a motor bearing in a $140 servo.

Btw, according to this study by NMB, link here, the number 1 factor that affect sleeve bearing life is the operating temperature. Their study shows life span drops by more than 60% once operating temp reaches 60degree C (140degree F) for a typical fan sleeve bearing.

For your bls254 (entirely plastic shell), heat dissipation could be an issue.

PS, now I understand why high torque futaba servos, such as the 37kg BLS172, have metal mid section and bottom plate.

[CostaRicaHeli]

I use triflow oil on shafts with moving parts on them (main, tail), synthetic grease on thrust bearings and dryfluid on gears. I also use the triflow on ball bearings which basically forces me to oil often.

[TucsonFlyer]

Thrust bearings get grease and motor bearings and OWB's get triflow every so often. Shaft bearings are all shielded or sealed and the tail shaft is always dry and clean. I clean all my unshielded/un-sealed bearings every 6 months or so.

Tucson is dust central so exposed oil/grease is just asking for premature failure.

[ERRATIC]

Finless approved...




Steve

[jtroutt19]

HAHAHA! You got a smelly and itchy tail there man!

Blue Waffle!!

[RaisedByWolves]

Originally Posted by amphibia

May I learn more about how you oil the bronze sleeve bearing on the futaba brushless servo motor?


So how did you lube/maintain it without breaking it? I have more than 12 futaba brushless servos. I could really use some help.

Thanks

Just dunk the whole works in oil.


OK, dont do that. Dont look up Blue Waffle or Sootikins either.

[jtroutt19]

Originally Posted by RaisedByWolves

Just dunk the whole works in oil.


OK, dont do that. Dont look up Blue Waffle or Sootikins either.

HAHA!!! Why not look up blue waffle......hehe

[Four Stroker]

"
- the bottom bronze sleeve bearing is blocked by the circuit board. The motor is soldered the circuit board and glued to the middle section of the servo. I know this because I broke open a used BLS351 servo. It had an intermittent screaming noise. The local futaba service center told me the motor was done and wanted 60 dollars to replace the motor. I couldn't justify the payment so I poked around myself. I screwed up and pulled the motor wires off and ruined it but I didnt see any non-invasive way to get to the bottom bearing.
"

That's why I threw it away ! JR servos have a hole in the circuit board so you can see the bearing.

[Waxxingibbous]

Scorpion bearing lube...not for the Addtl oil you'll eventually need anyway but the long nice controlled needles, I don't need oil everywhere...it always beads one to two drops nothing more and I love it...pitch pump related tail wag vanished after lubing it... Not a good idea to run a new tail shaft and main shaft with zero oil haha learned that one the hard way after about 10 flights...