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HomeScaleAircraftHelicopterScale Model RC Helicopters › Roban Superscale flyers.... Service BuLLETIN..
08-24-2014 07:22 AM  3 years agoPost 21
Heli143

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Phenix City, Alabama

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Hi spy29
That's what confused me...
My motor has a long shaft and it went thru the pulley went all the way.
Can't explain the difference between your pulley and mine.

Barry,
Thank you for the advice. I thought about doing that but wasn't sure. First modern heli I've had with a drivetrain belt.

Thanks for the reassurance!

Roy Mayoral

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08-25-2014 05:47 AM  3 years agoPost 22
JestRR

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Florence, Oregon

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First of all this is NOT a service bulletin!! This is builder error.If you had asked others if they had encountered this problem, a better solution may have come about.

Some of the pulleys were reamed incorrectly or the reamer was worn or had a taper. That being said, to fix it correctly is not hard. I had the same pulley and drilled out the part that was slightly smaller but not all the way through. just enough to let the shaft of the motor through, but as to retain the integrity of the hole. a simple drill bit just slightly smaller than the original hole worked just fine.

Now i see two things wrong with the pulley flange that has come off.
I see belt wear marks indicating the belt had been rubbing on the flange excessively for quite some time, being miss aligned, and at only 40 flights, it was detrimental to the life of the belt. Most all pulleys have press fit flanges.

The other problem i see is the half moon cuts that were ground into the flange to try and align the improper tool to tighten the motor bolts.( I.E. a ball hex wrench was the tool that needed to be used) this is more to the reason as to why your belt failed shown by all the shavings that are on the underside of the mechanics.

There are several of us in my area with the same mechanics, belts and pulleys in several different types of scale helis, with hundreds of flights, with the same pulleys. the point is to make sure the pulley is lined up ether way, and check it for wear! if i had seen shavings like the ones i see in your pictures, those mechanics would have been pulled immediately.

The Roban line of mechanics and helicopters are not with out some problems, but so are all manufacturers. You only hear about the problems and not the ones that are flying correctly.

Mike Spinner
Florence OR
SCALE JUNKIE!!
NORTHWEST SCALEWORKS

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08-25-2014 07:30 AM  3 years agoPost 23
spy29

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USA

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Yes its a service Bulletin..to warn roban flyers..to double check....their untrue poorly made/reamed pulleys.,
( Means > DIS ASS emMBLE THE WHOLE HELI.for a PUlley!)

JEST RR >> i did not grind the thoee cutouts it was like that when i got it and I DO NOT NEED THE CUTOUTS TO TIGHTeN THE SET SCREWS,plenty of space about 15mm wide. U NEED TO LOOK AGAIN

Also the "Half moon cuts" are directly opposite each other top and bottom >While the Set Screws are 45degrees of each other then "Half Moon cuts".and also FOUND on the bottom flange.??why??
>> why not Enlighten us more with your KEEN EYE, skill and ezpertise?

.You make it sound like THE BUILDER AND pulley are the only Problems the Roban mechanicxs have. in FACT after building 3 roban 700 helis..i AM NOT THE only one who feels THAT "EVERYTHING" ON THE ROBAN MECHANICS IS A PROBLEM..YES EVERYTHING.. I HAVE BUILT MY SHARE OF SCALES FROM VARIO TO SMART MODELS.,QUALITY AND RELIABILITY IS WHAT THE ROBAN MECHS.DO NOT POSSESS....
...
p.s i pulled the pulley..from my ROBAN AH-1W. WOW.IT ALSO A little different.it has BOLTS on the bottom! So before you start Clairvoyant Accusations..I DID NOT PUT THOSE Bolts..IT CAME That WAy.From the Factory...!! makes me wonder why????

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08-25-2014 01:21 PM  3 years agoPost 24
doorman

rrProfessor

Sherwood, Arkansas

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Just Following Along!!
I have been watching this thread, and it sounds to me as if an improperly made pulley was supplied with this kit.. bottom line, defective part..
As far as who did what, with what tool was used, sounds like a very long strech to me!!!! I have built a lot of scale helis, and agree that they all have some "quarks"(for no better term) and sometimes it takes a failure
of this type to find it..
From reading both sides, it doesn't sound like it is/was a common problem, and Spy just got lucky enough to get a bad one..
Is it a service bulletin? I would certainly look my machine over to see if I had an improperly made part on mine, after reading this thread..
I do not have any experience with the Roban kits, but if I were to build one, I would be thankful for the info found here.. I have seen a lot ofthese machines fly, and they seem to be nice flying, and have gotten a lot of people to try sport scale, that might not want to do a competition quality scale machine... but wanted a great looking sport scale model...these fit the bill, even with some minor issues..
Remember to have fun... thats what hobbies are for!!

Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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08-25-2014 03:33 PM  3 years agoPost 25
JestRR

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Florence, Oregon

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Spy,
Did you buy it new or used?

Curiously, the one from your AH1 had no half moons...Haven't heard of any others with half moons....Not being "Clairvoyant" or making "Accusations" just pointing out the obvious.

The whole point of all these forums is to get information to and from others. Thanks for the "SERVICE BULLETIN" And just FYI, i did go out and look at my heli and check for any weird situation i could find. I must have gotten a good one and yours is just all F-ed up! Sorry to hear you needed to buy three of these helis to come to the conclusion that ""EVERYTHING" ON THE ROBAN MECHANICS IS A PROBLEM..YES EVERYTHING..."

Most of us in the scale side of RC Helis has figured out that Nothing fits just right the first time and you may have to adjust to get it to work properly. But we usually ask if anyone else has seen a particular problem before we go out and bash a whole manufacturer.

Maybe a better way for you would have been to contact ROBAN about your situation, and they could have given you better information....just a thought!

Mike Spinner
Florence OR
SCALE JUNKIE!!
NORTHWEST SCALEWORKS

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08-25-2014 05:48 PM  3 years agoPost 26
spy29

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USA

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DID I buy it New or Used? HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAH!!!

Doorman ..gets its right everytime ...thanx Stan

UPDATE TO Roban Service bulletin;
>>>>>>> >>ther are 2 kinds of 22T ROBAN PULLEYS.(that I know)
ONes WITH BOLTS @ the Bottom AND AND ONES WITHOUT.,The ones Without bolts, are Pressed fit will eventually fail due to the loads from the belt..I would recommend replacing it.when u get the chance, or Chance that it wont Fail.and damage ur heli
>>>and also maybe getting a better gear ratio depending on Headspeed and MOTOR KV used >THE Goblin 630/700 pulley Matches up well..

After BUILDING 3 ROBAN 700'S..The PULLEY is the LEAST OF aLL ITS PROBLEMS..,,,this Model did not reach 40+ flights by being built stock.. from bearings to ball links..and sloppy main shaft..all have been replaced/Fixed.and then THIS.PULLEY!!.and don't even get started on Gear mesh..and runout.,,,
,
>> if the pulley did not fail this heli would still be flying just fine..
10 consecutive "problem free" flights on Stock Roban is a milestone.

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08-26-2014 12:46 AM  3 years agoPost 27
JestRR

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Florence, Oregon

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well good for you for reaching 10 flights. Glad its working for you! But it seems if you are so unhappy with the robin line of helis, why did you keep buying them? and you never did answer my last question....Did you buy it New or Used? Cause i'm still trying to figure out where the half moon cut outs came from.....

And how were your bearings? Did you replace them with the right type? They are specific you know!!

Mike Spinner
Florence OR
SCALE JUNKIE!!
NORTHWEST SCALEWORKS

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08-26-2014 01:16 AM  3 years agoPost 28
spy29

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USA

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quote "And how were your bearings? Did you replace them with the right type? They are specific you know!! "
>> HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA<<<<<
please someone tell this guy its in the manual and welcome him to the world of Common sense...HAHAHAHAAHAAA

I was trying to Alert Roban owners about certain problems., not bash or Attack anyone..
wih your "not so Keene eye" and Flawed observations and expertise,i find I should not even stoop to your level,its just not PRODUCTIVE or helpful...not even informative..LOL
.
although patethic and besides the point>> all my RoBANS WHER BOUGHT BRAND NEW IN BOX...

fyi: not very many robans make it to the USED for sale ADS,,,.because they are usually destroyed.or Damaged.before Resale due to the fAILURES IN THE MECHANICS.. ..at least 14 b-new ones on my field all destroyed or damaged..non repeat customers too.

>>im actually one of those that is still trying to make it work..a <<<

please share some of you hundred flight hour Roban scales that you speak highly of...please share.. enuff of the YIPYAP

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08-26-2014 02:21 AM  3 years agoPost 29
JestRR

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Florence, Oregon

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HAY DUMB ASS!!! Do i have your attention yet?! OK good. Finally a simple answer to a simple question, "Was this a new or used Heli?"

" although patethic and besides the point>> all my RoBANS WHER BOUGHT BRAND NEW IN BOX..."

I swear your typing is worse than mine and all my friends know how bad i am. They are rollin reading this thread!!!

Its always fun to keep stirring the pot with people like you. Your typing keeps getting worse and BIGGer the more pissed off you get. Check your blood pressure lately? might be do for some medication!!

If you are not trying to bash Roban, then why are you saying that "EVERYTHING IS WRONG WITH THEM!" I still say it took you WAY to long to figure that out.

OK...here is another OBVIOUS question for ya. see if you can answer this....Where did the half moon cut outs come from? NO ONE has them on any of theirs??!!
As for the bearings, just go replace them with the run of the mill type that you THINK they are and see how it goes for the next 10 flights. That is if you make it that far with your AWESOME SKILLZ and Knowledge of flight and maintenance....

IF you'd like to see my scale heli's fly, go do a search and see for your self. Its really not that hard.

Mike Spinner
Florence OR
SCALE JUNKIE!!
NORTHWEST SCALEWORKS

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08-26-2014 03:13 AM  3 years agoPost 30
JestRR

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Florence, Oregon

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Hay ">> HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA<<<<<"

can you tell me what bearing i should buy?? I can see the size but do you know what type it is???

Here is the manual details in the back...

Here is the breakdown image.

Mike Spinner
Florence OR
SCALE JUNKIE!!
NORTHWEST SCALEWORKS

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08-26-2014 03:30 AM  3 years agoPost 31
Mojave

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Palos Verdes, Ca. USA

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I wasn't going to enter this mix, but here's my .02 I have seen the Roban helis up close and they are NOT a total POS as you might believe. Mike is absolutely CORRECT regarding the main shaft bearings. If you'll notice, Roban doesn't use a thrust bearing and collar under a standard radial bearing at the top main shaft bearing location, like vario etc.. They use a specially designed bearing that takes a radial load and thrust load. So if you just replace the top bearing with a standard radial bearing, your heli is sure to be short lived... Just FYI...
Also, your motor drive pully IS mounted upside down. Look at the manual, the flange with grub screws faces down, away from the motor can, not against the motor can. The stock pulley doesn't have 1/2 moon cut outs, because if installed properly it doesn't need them. I'm guessing that the cut outs were done in an attempt to gain better access to the motor mounting screws (for belt tension adjustments). I say this because both cuts are in line with each other, 180 degrees apart and directly under the motor mount screws, so it makes sense. Not saying that you did this mod, just that I think that's why it was done. If you bought this kit new (as stated), then who else made these cuts?? All pulleys of this style typically have pressed on belt guides, this is because it's not possible to properly machine the teeth of the pulley without designing them this way.
Barry

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

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08-26-2014 03:35 AM  3 years agoPost 32
JestRR

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Florence, Oregon

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Here is what i have and it looks like your pulley was put on upside-down.......Hummmmm

Here is another Forum member who has the same heli as you and LOOK.....His is right side up too......

CURIOUSLY....NO half moon ground in cut outs.....?
How did those get on your's??

Mike Spinner
Florence OR
SCALE JUNKIE!!
NORTHWEST SCALEWORKS

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08-26-2014 03:37 AM  3 years agoPost 33
JestRR

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Florence, Oregon

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Hay Mojave...
Is this the picture in the manual you were talking about???
Hummmmmmmm.....

Mike Spinner
Florence OR
SCALE JUNKIE!!
NORTHWEST SCALEWORKS

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08-26-2014 03:58 AM  3 years agoPost 34
Mojave

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Palos Verdes, Ca. USA

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Yup, that's the correct page from the manual. IMHO, if you mount the pulley upside down, it puts the centerline of the pulley too far away from the motor can (off center from the driven pulley), so the belt won't properly center while running. So what ends up happening is the belt rubs the pulley flange, putting an unwanted load on the flange (it's not designed for this). To the naked eye it might look like it's lined up properly, but when it runs, the belt will try to center itself and will end up riding up and rubbing the flange at higher RPM. My best guess is that this misalignment, along with the 1/2 moon cut outs, probably weakened the press fit of the flange to the pulley and it eventually failed.
Barry

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

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