View Full Version : flat spotting motor shaft...
johnb
10-27-2006, 03:21 PM
just building my first Lepton - got a Hyperion 3025/8, is it advisable to grind a flat spot on the shaft to lock the pinion in place?
toyturbo
10-27-2006, 07:53 PM
Definetly grind two flat spots on the shaft for both set screws. It will save u a headache in the future.
Voyager
10-27-2006, 08:27 PM
Remember to put the motor in a bag to prevent metal shavings from getting inside.
... Rob
4cyclic
10-28-2006, 09:11 AM
I did not file a flat myself, but I used a hardened hex tip and carefully torqued the 2 setscrews after loctite. I have 125 flights on mine , no problems.
Flats spots are addtional insurance though.
Finless
10-28-2006, 12:36 PM
If the pinion had only 1 set screw I would have done the flat spot. With 2 I have had no need either like 4cyclic.
Bob
3secondsToImpact
10-28-2006, 02:55 PM
Did not flat spot my motor shaft either, heli went full idle up in bedroom(on Desk in front of me) JUMPED on it like a live hand grenade(scars to prove) anyhow the pinion stayed solid, but not much left of the main gear($28.95 u.s.) now thats overpriced by about $25!!!