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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Roban main gear/pulley one way bearing failure
02-03-2016 03:35 AM  34 months agoPost 21
TailKiller

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Panama City, FL

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+++1 Steve..
That's what I'm hoping for.. Crossing fingers and toe's.. The A-star is my first Roban..

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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02-04-2016 02:47 AM  34 months agoPost 22
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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well we have another gear/pulley on the way so we will try it again.

drive a rotary, fly a rotorcraft

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02-04-2016 05:08 PM  34 months agoPost 23
Heli143

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Phenix City, Alabama

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a big box from Germany is on the way too

just got a call from Customs

Roy Mayoral

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02-05-2016 12:46 PM  33 months agoPost 24
Heli143

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Phenix City, Alabama

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Roban parts arrived yesterday.

Again, not disappointed at all with the fast shipping service I've received thus far.

Roy Mayoral

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02-05-2016 06:35 PM  33 months agoPost 25
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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Cool deal. I will get that gear swapped out and your clutch conversion done this weekend

drive a rotary, fly a rotorcraft

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02-06-2016 02:58 AM  33 months agoPost 26
TailKiller

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Panama City, FL

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I'm sorry... Was it the one way bearing or the Roban stock motor pulley that let go??

Roy.. are you using the roban head or have you upgraded.. I have had to file down hair thin brass shims to remove slop in the blade grips... I'm thinking of just getting the sab head and be done with it.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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02-06-2016 06:43 AM  33 months agoPost 27
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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the one way bearing is what let go.
the stock head is still being used and so far it has no notable slop. I like the head I just don't like the look of the "J" arms although they do make phasing a no issue and eliminate the need for a swash driver.
I have roys mechanics at my place. I am replacing the big pulley and giving it the clutch mod.
hows your machine coming along?

drive a rotary, fly a rotorcraft

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02-06-2016 04:10 PM  33 months agoPost 28
TailKiller

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Panama City, FL

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Well.. it's going well. I got a lot of work done this week. I was able to do nothing but work on it every day this past week.. I'm ready for a test flight. I designed a landing gear [contraption],, mounted it and got the CG set for the test.
I've got in a lot of bench test at 1300 rpm and got the blades tracking as well as possible. [needs turnbuckles] All the testing helped me to get the tail gear pretty quiet. I put a true goblin motor pulley on and may change the main shaft after the test.. we'll see..
All my lighting has been installed and the cockpit and cabin are done except for the flight controls.
My biggest issue is the blade grip slop... The feathering shafts need to be a hair more inward in the head. But the set screws are wanting to strip so I can't try to push them in a bit more.
I've been thinking of posting a thread. Maybe this weekend.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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02-06-2016 11:11 PM  33 months agoPost 29
Mojave

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Palos Verdes, Ca. USA

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It's pretty common for the feathering spindles to be .005-.010" too long. That's designed so that when you tighten down the grip retaining bolt it bottoms out on the spindle and doesn't put pressure on the thrust bearing races. I'd prefer long over short, because when they're short the thrust bearing will bind when you tighten down the spindle bolt. I wouldn't be too concerned with a small amount of slop, as the centrifugal force puts the grips out where they need to be anyway. How much in/out slop do you have? By the way, you never notice this little bit of slop on a 3D fBL head, because the dampers usually push out on the spacer for the grip bearing. But you'll sometimes see it on a rigid multi blade head.
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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02-07-2016 06:55 PM  33 months agoPost 30
TailKiller

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Panama City, FL

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I was aware of the slop from the start. I could move the blade grip up and down. I was getting a very large X-wing effect at the tips of the blades during spool up. Yes, it did settle down and narrow up once rpm was reached.
Makes tracking difficult.
I was able to use extra brass blade grip spacers and file / sand them down to 0.23mm and place it on the spindle first. That made all the difference. I did all 3 grips. The thrust bearings are free and there is no binding, even with extreme outward pressure on the grip.. They are very well lubed and they are free. It has made a huge difference in the tracking.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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02-07-2016 08:51 PM  33 months agoPost 31
Mojave

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Palos Verdes, Ca. USA

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OK, understand that. That kind of slop is different than what I was referring to. I just meant a tiny bit of in/out play along the axis of the axle/spindle. There must be some other slop in the grips or bearings if the grip is able to move up and down that much...
Barry

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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02-07-2016 09:28 PM  33 months agoPost 32
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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I have found that slop and play will vary from unit to unit especially when there's plastic involved. Mine was tight n smooth all around

drive a rotary, fly a rotorcraft

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02-09-2016 02:01 AM  33 months agoPost 33
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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ok heres the latest. Got the pulley from Roy yesterday and started the replacement process. this task isn't one that's any fun. getting to that pulley to remove it involves removing both side frames. that is complicated even more by the dome head screws used to hgol the side frames in place. I had to drill half of them out to remove them. I think the allen wrench of that sie is too small for any rc heli ( its one reason I don't to the 450 size stuff) its so easy to strip em and I hate cussing on the lord's day!
anyway, the task continues.

drive a rotary, fly a rotorcraft

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02-09-2016 02:54 AM  33 months agoPost 34
Heli143

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Phenix City, Alabama

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Damn Emile! Sorry to put you thru all that work

BUT on the positive side, now you'll know these Roban mechs like the back of your hand.

Roy Mayoral

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02-09-2016 06:09 AM  33 months agoPost 35
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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not a problem Roy, I want to see this ship going and going well, its a vendetta now lol!

drive a rotary, fly a rotorcraft

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02-09-2016 12:45 PM  33 months agoPost 36
TailKiller

rrApprentice

Panama City, FL

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Please let us know what you use for replacement screws... I had to drill 2 to install the motor the first time.

,Dennis
http://pcrcheliclub.com/
700 Astar Super Scale T-600 Bell 206 Trex 600 Naza H DX8

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02-09-2016 02:45 PM  33 months agoPost 37
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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On my mechanics I replaced them all form the beginning. I used 3mm screws, the same like the kit comes with, but they require a 3mm wrench instead of a 2.5mm
this is what the mechs have

this is what I replace them with on the right.

drive a rotary, fly a rotorcraft

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02-09-2016 02:55 PM  33 months agoPost 38
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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this little gem is being replaced with a 3mm nut and bolt as well. a 700 size machine shouldn't use anything smaller than a 3mm hardware in spots such as this IMO.

drive a rotary, fly a rotorcraft

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02-09-2016 09:49 PM  33 months agoPost 39
old nitroman

rrVeteran

Naples florida

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I replace mine to the 3mm before anything else, even new I had a very hard time

E5s and E7se,and a 766, Roban bell 222 800 superscale,450 bell 4 bladed head,gobby 380and 420 ,180cfx

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02-09-2016 10:16 PM  33 months agoPost 40
Mojave

rrElite Veteran

Palos Verdes, Ca. USA

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Hi Emile, sucks that you had to replace all the button head hardware. But I will say that Roban gear train looks very robust. I also agree with replacing the bolt in the gear, especially if you're swinging bigger blades.
Barry

PS. Roy will owe you a couple of cold ones...

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Roban main gear/pulley one way bearing failure
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