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Joseph T. · 05-22-2010, 05:42 AM

I thought i read on here the other day that one of our forum users here had luck with taking the wobble out of the center hub? My SR came shipped from the factory with a decent wobble but i just dealt with it for 3 months.

Well i finally shredded that center hub and I install a brand spanking new one and its twice as bad as the original was, wtf !

Anyone have any tips or do i just live with it? I couldnt imagine seeing my SR's head spin true at low rpms.

scoti333 · 05-22-2010, 01:10 PM

Here's what I do since each hub I put on seems to wobble worse than the one before. I take the whole head assembly off and leave just the hub. Then I tape an Allen wrench to the antirotation bracket to where the short end of the wrench is closest to the top of the hub without touching it. After that I spin the main gear slowly to see where it's bent, give it a little heat from a hairdryer, and carefully bend it until when you spin the main gear and the Allen wrench stays a roughly equal distance to the top of the hub all the way around. It probably will take a couple of tries and, wa-la! It's as close as a piece of molded plastic's gonna get to being true. Hope that helps

John Shipley · 05-22-2010, 06:11 PM

S, That is very interesting....I'm going to have to try that......thank, john

Joseph T. · 05-22-2010, 08:53 PM

Nice scoti, thats some real good info. I'm gonna try that next time i gotta re-build the head.

THANKS

scoti333 · 05-22-2010, 09:43 PM

No prob!

E-fanatic · 05-23-2010, 06:42 AM

I wish that someone would come out with an aluminum hub so we wont have to worry about this. Mine has the darn wobble to it too.

Mojappa · 05-23-2010, 07:36 AM

Quote:

Originally Posted by E-fanatic

I wish that someone would come out with an aluminum hub so we wont have to worry about this. Mine has the darn wobble to it too.

+100. Hurry up E-flite, then get back to work on my MCP! Been flying my dad's Novus 125CP and it's getting harder to talk myself into waiting for an E-flite one. If only the novus didn't have such a crappy Tx, no TH and IU is on the wrong side! That could end badly.

DKS_ONE · 05-23-2010, 03:53 PM

Quote:

If only the novus didn't have such a crappy Tx, no TH and IU is on the wrong side! That could end badly.

Lmao! No joke!! "Ok, coming in for a landing, touch down in 12 inches. Engage throttle hold... correction, compensating for unanticipated rpm increase and changing shorts!"

+1 to the wobbly head, what gives on these things? Waited a month and a half for my new parts and took my precious time rebuilding. Spool up and at the low rpm sweet spot got a vibe that dances the heli from side to side. A little more juice and she's smooth as silk... annoying. I'm gonna try that allen key thing scotti, thx for the idea!

scoti333 · 05-24-2010, 12:17 PM

Just payin it forward! Glad I could help.

BrandonB · 05-24-2010, 12:36 PM

The last head rebuild I did on my SR, I didn't tighten the jesus bolt down all the way. I just screwed it in until the bottom of the allen head bottomed on the hub. I didn't want to deform the base of the hub and it seemed to help as I didn't need to straighten this one. I've had 2 wobbly hubs before this one and the only thing I did differently on my current hub was not torque down the jesus bolt. Coincidence?

nuke · 05-24-2010, 12:41 PM

Quote:

Originally Posted by BrandonB

The last head rebuild I did on my SR, I didn't tighten the jesus bolt down all the way. I just screwed it in until the bottom of the allen head bottomed on the hub. I didn't want to deform the base of the hub and it seemed to help as I didn't need to straighten this one. I've had 2 wobbly hubs before this one and the only thing I did differently on my current hub was not torque down the jesus bolt. Coincidence?

I did this as well. Seems if you tighten it down, it will deform the shape. I just left mine a little loose, (but in though), and it helped.

SeanM · 05-24-2010, 12:41 PM

That's a likely possibility. The plastic used with these parts is easy to deform when you over tighten the screws.

scoti333 · 05-24-2010, 02:18 PM

I definitely noticed this, too. That, along with checking and correcting how bent (or not bent because they're all different) it is will take most or all the wobble out of your hub. Can't wait for a cnc hub!

BrandonB · 05-24-2010, 05:54 PM

The main gear will also deform if you tighten the lock nut / bolt down too much. I just let the lock nut do its job and leave it practically loose. Doesn't look like it will ever vibrate free cause of the nylon in the nut.

Hutch76 · 07-03-2014, 12:21 PM

Quote:

Originally Posted by E-fanatic

I wish that someone would come out with an aluminum hub so we wont have to worry about this. Mine has the darn wobble to it too.

Microheli has CNC aluminum center hubs. However, you will also need to buy the aluminum flybar system as well since the original system won't fit on the CNC hub (sounds like a money grab to me).

Dubbin1 · 07-04-2014, 10:30 PM

Quote:

Originally Posted by Hutch76

Microheli has CNC aluminum center hubs. However, you will also need to buy the aluminum flybar system as well since the original system won't fit on the CNC hub (sounds like a money grab to me).

Thread is over 4 years old

nighttrain06 · 07-05-2014, 04:17 AM

Quote:

Originally Posted by Dubbin1

Thread is over 4 years old

Thats ok, some of us still messing with the SR......

therick04pp · 11-09-2014, 01:21 AM

Yup.. still messing with it...

It's like the energizer bunny.

05-22-2010, 05:42 AM	#1 (permalink)
Joseph T. Registered Users Join Date: Mar 2010	Straightening out the center hub? I thought i read on here the other day that one of our forum users here had luck with taking the wobble out of the center hub? My SR came shipped from the factory with a decent wobble but i just dealt with it for 3 months. Well i finally shredded that center hub and I install a brand spanking new one and its twice as bad as the original was, wtf ! Anyone have any tips or do i just live with it? I couldnt imagine seeing my SR's head spin true at low rpms.

05-22-2010, 01:10 PM	#2 (permalink)
scoti333 Registered Users Join Date: Apr 2010	Straightening out the center hub? Here's what I do since each hub I put on seems to wobble worse than the one before. I take the whole head assembly off and leave just the hub. Then I tape an Allen wrench to the antirotation bracket to where the short end of the wrench is closest to the top of the hub without touching it. After that I spin the main gear slowly to see where it's bent, give it a little heat from a hairdryer, and carefully bend it until when you spin the main gear and the Allen wrench stays a roughly equal distance to the top of the hub all the way around. It probably will take a couple of tries and, wa-la! It's as close as a piece of molded plastic's gonna get to being true. Hope that helps __________________ -Goblin 700: Crashed but re-building, still needing electronics -Goblin 630: CC Ice 120HV, vBar

05-22-2010, 09:43 PM	#5 (permalink)
scoti333 Registered Users Join Date: Apr 2010	Straightening out the center hub? No prob! __________________ -Goblin 700: Crashed but re-building, still needing electronics -Goblin 630: CC Ice 120HV, vBar

05-24-2010, 12:17 PM	#9 (permalink)
scoti333 Registered Users Join Date: Apr 2010	Straightening out the center hub? Just payin it forward! Glad I could help. __________________ -Goblin 700: Crashed but re-building, still needing electronics -Goblin 630: CC Ice 120HV, vBar

05-24-2010, 12:36 PM	#10 (permalink)
BrandonB Registered Users Join Date: Mar 2010	Tight Jesus The last head rebuild I did on my SR, I didn't tighten the jesus bolt down all the way. I just screwed it in until the bottom of the allen head bottomed on the hub. I didn't want to deform the base of the hub and it seemed to help as I didn't need to straighten this one. I've had 2 wobbly hubs before this one and the only thing I did differently on my current hub was not torque down the jesus bolt. Coincidence?

05-22-2010, 06:11 PM	#3 (permalink)
John Shipley Registered Users Join Date: Sep 2008	S, That is very interesting....I'm going to have to try that......thank, john

05-22-2010, 08:53 PM	#4 (permalink)
Joseph T. Registered Users Thread Starter Join Date: Mar 2010	Nice scoti, thats some real good info. I'm gonna try that next time i gotta re-build the head. THANKS

05-23-2010, 06:42 AM	#6 (permalink)
E-fanatic Registered Users My HF Map location Join Date: Dec 2009	I wish that someone would come out with an aluminum hub so we wont have to worry about this. Mine has the darn wobble to it too.

05-24-2010, 12:41 PM	#12 (permalink)
SeanM Registered Users Join Date: Jan 2010	That's a likely possibility. The plastic used with these parts is easy to deform when you over tighten the screws. __________________ - 6S TREX 450 Pro FBL - µBeast, MKS, Castle Creations - Goblin 500 - Kontronik Pyro 600-12, Jive 100lv, iKon, BK servos - TBS Discovery - Pixhawk - Spektrum DX7

05-24-2010, 02:18 PM	#13 (permalink)
scoti333 Registered Users Join Date: Apr 2010	Straightening out the center hub? I definitely noticed this, too. That, along with checking and correcting how bent (or not bent because they're all different) it is will take most or all the wobble out of your hub. Can't wait for a cnc hub! __________________ -Goblin 700: Crashed but re-building, still needing electronics -Goblin 630: CC Ice 120HV, vBar

05-24-2010, 05:54 PM	#14 (permalink)
BrandonB Registered Users Join Date: Mar 2010	Main gear will also deform The main gear will also deform if you tighten the lock nut / bolt down too much. I just let the lock nut do its job and leave it practically loose. Doesn't look like it will ever vibrate free cause of the nylon in the nut.

11-09-2014, 01:21 AM	#18 (permalink)
therick04pp Registered Users Join Date: Oct 2014 Location: Massachusetts	Yup.. still messing with it... It's like the energizer bunny. __________________ Spek iX12 \| DX7G2 \| NANO CPX \| NANO S2 \| MCPX BL2 \| 120SR \| Fusion 270 \| AH64 Apache (450) \| D380TBR \| 450X \| OXY 4 "360" \| Goblin 420 \| 500X \| 550X \| AGILE 5.5 \| OXY 5 \| AMA# 1157132

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