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04-28-2013 06:36 AM  7 years ago
Topic Vote0Post 1
Santiago P

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Dayton

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main blade axle too short.
Almost finishing the R30

Took the head apart, had to loctite all its bolts and screws, grease the thrust bearings.

In the process of putting it back together, It seems the axle is about 1mm too short.
As a tighten the two axle bolts the head jams and it wont rotate.

I am bummed out having to order an axle to finish the heli.

or
Is there a trick to the head bearing stack?

S
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04-28-2013 12:27 PM  7 years ago
al_voisine

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Grand Falls, New Brunswick, Canada

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Have you possibly reversed the order of the thrust bearings??
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04-28-2013 04:02 PM  7 years ago
Santiago P

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Dayton

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Enlight me please.

Is the large ID thrust plate inside or out?

Santiago
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04-28-2013 05:10 PM  7 years ago
James Kovach

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canton, oh - US

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Did you install all the shims. They do not all need to be installed*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip
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04-28-2013 08:21 PM  7 years ago
Santiago P

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Dayton

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Even without any shims, the moment one start to set the spindle screws, the grips become solid, they wont rotate.

All I can think is this spindle is out of length tolerance, or there is something wrong internaly with the grips.

Can someone tell me what length dimensions the spindle should be?

S
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04-28-2013 08:28 PM  7 years ago
adamsz06

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Geilenkirchen Germany

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Are the grip bearings fully seated and square with the pockets?R.I.P. Roman
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04-28-2013 09:01 PM  7 years ago
Santiago P

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Dayton

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Grip bearings are factory installed, and yes they are seated.

S
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04-28-2013 09:10 PM  7 years ago
Santiago P

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Dayton

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Here's a picture for you:

If I bottom out the grips against the main hub, basically no dampeners, no shims, the spindle still comes short 1mm below the bearing stack.

S
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04-29-2013 03:09 AM  7 years ago
James Kovach

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canton, oh - US

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Sounds like they put the wrong spindle in your kit. Sorry, but you will need to get ahold of Heli-World/Century. They will send you the right spindle.*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip
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04-29-2013 11:30 AM  7 years ago
rapidity

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ohio

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If these are the plastic grips, I ran into the same problem on my multihead. They say you need a different shim package. I said screw it and got the metal grips. I think they have a problem with their plastic.
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04-29-2013 02:34 PM  7 years ago
Santiago P

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Dayton

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They are aluminum grips.

I did a work around after staring at all the shims and the spindle lenght.
Out came the 2 shim washers.
I removed the 1mm spacers and placed the large 0.12mm washer in their place, they seem to work in trasfering the grip load from the radial bearing oute case to the thrust bearing.

The small washers were still too thick to take the small gap, so I made two 0.05mm copper shims to put between the dampener and the grip.
That does a perfect stack with just a smidgen of preload on the grip, and maintaining smooth rotation.

Thanks Bob and James for your replies.
Look fwd to get this hog in the air in the next two days.
WAS Really starting to like this kit.

Santiago
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05-14-2013 06:24 AM  7 years ago
thedrill

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Reno, NV, U.S.A.

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I ran into this also. And yes I found out of three shafts I had, they were 3 different lengths. Go figure. Just used the longest one and it worked. Also had one bent right out of the package. How does that happen??Vote the bastards out!!All of em T-rex 450Pro, T-rex 500 Radical G20
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06-25-2013 04:34 AM  7 years ago
RM3

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Killeen, Texas - USA

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How does that happen??
the same way that they don't sell a feathering shaft for the all metal FBL head for the G20...the ends on it are for the smaller set of axial bearings, ordered a feathering shaft and it turns out to have the thicker ends that use the P90 size head axial bearings...BS!

Centurys got thier heads up thier ....
showing a preference will only get you into trouble, 90% of everything is crap...
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06-27-2013 02:32 AM  7 years ago
Gearhead

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Vt

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I just research this for you guys, this is what I found,

Part# HW6180BS 97mm new FBL metal grips
Part# HW6180AS 94mm plastic and older metal grips
Part# HW6180A 94mm (black) plastic grips
Jim
Buzz Buzz Buzz
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06-27-2013 03:01 AM  7 years ago
RM3

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Killeen, Texas - USA

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I ordered the *AS part # as it was in the G20s list of spare parts...it did not fit the FBL for the G20,

6180BS uses all sorts of shims to get it to fit...unlike what I had before, just the standard aluminum spacer between the dampener and the grip bearing.

I ended up just putting the old feathering shaft on the lathe and spending 30 minutes getting it strait again.

On that note, were in the world are the manuals for the G20s FBL metal head?
showing a preference will only get you into trouble, 90% of everything is crap...
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07-09-2013 03:46 AM  7 years ago
turboomni

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East of the Equator

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I ordered a Hobby;;;King crap DFC head to go FBL on my lowly OLD Trex 450 V2,,the same thing happened . I tightened the loose spindal screws and she locked up,,,WTF??? Thank god I had my hobby shop guru with all shims available in house to dissect the piece of crap and make it work. Many times you need alot of different shims to make these things work. I went to an Align DFC head and everything worked as advertised. I threw the hobby king crap in the garbage. I do not know of Century having this problem personally but it sure rings a bell. Sorry about your problems,,,,they are maddening. Many people have used different heads like from ALIGN on Century's I believe with great successSetup is everything, All my heli's can fly far better than I can pilot them
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07-09-2013 04:01 AM  7 years ago
JKos

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Redondo Beach, CA

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In this day and age of precision machining it simply astounds me some of the issues we have.

- John
RR rules!
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07-09-2013 04:34 AM  7 years ago
Gearhead

rrMaster

Vt

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wow,
just like Hirobo, MA and Robbe and JR as well as other brands that make differnt spindles for different heads
Jim
Buzz Buzz Buzz
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07-09-2013 04:59 AM  7 years ago
turboomni

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East of the Equator

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1mm difference,,,CNC machines WTF?? What other model in their lineup would require a 1MM difference in length,,I Doubt this very much,,some guy in asia punched in the wrong numbers,,,or his CNC machine is due for a checkup,,or he got bad information,,,like my crap Hobby King DFC head,,,which is total junk...Setup is everything, All my heli's can fly far better than I can pilot them
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07-09-2013 06:09 AM  7 years ago
Santiago P

rrProfessor

Dayton

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What does the HK DFC junk has to do with the topic?

We are talking about the quality control in many G30 and G20 Century heads is bad as many folks building new heads are discovering spindles with wrong lenghts.

And yes, 1mm too short does result in jamming the bearing stack in a 700 size machine.

Never had this happened in a Hirobo, MA, JR, or Schluter.

S
Team Minicopter - PeakAircraft.com
FUTABA.USA - Team Kontronik - Scorpion Motors-
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