pinion coming loose - Page 2

David H · Oct 31, 2009, 06:54 PM

PHP Code:


			
Yes, if you heat them beyond 170 degrees Fahrenheit (80 degrees Celsius) the magnets will quickly loose their magnetic properties

Steve whilst I agree using a soldering iron on the armature is not necessarily a good idea. There are several grades of NdBFe magnets some have max operating temps of 180C. The max N rating available in the magnets is lower for the higher temps. Steve Neu recently said that he was using the 180C max operating temp magnets, previously he had been using 150C, probably because the strength he was after was not available in 180C originally.

Dbox · Oct 31, 2009, 06:54 PM

Steve,try to heat up the magnets through 3.2mm shaft to even half of the not recommended temps and THEN REPORT.
Yuri.

flying evader · Nov 01, 2009, 09:30 AM

Quote:

Originally Posted by CharlieS

What model Kontronik is it, Kira or FUN? I just ordered a FUN 480-42 at Tower and will mate a 5.2 Kontronik GB to it using old loctite 638.

I the pinion on an arc 47 1 turn break loose when I switched to the g3 hyperion cells. I remembered that the shaft was smooth and a bit looser fit to the pinion than most shafts. I sanded the shaft slightly and reset the pinon and flew 24 hours later with no problem.

Charlie

Kira 480 from tower.. couldn't resist the prices..

I took the pinion from an arc motor, which by the way was a pain to get off, even with heat applied... this was applied with 648, which makes me scratch my head since it worked so well on the arc motor...

Andy W · Nov 02, 2009, 06:51 AM

Any chance the pinion is not the *exact* size?
..a

flying evader · Nov 03, 2009, 05:44 PM

i think it is.. the shaft size is the same as the fun 500.. 3.17mm

Andy W · Nov 05, 2009, 06:58 AM

Not had to do it often, but I've never had a pinion come loose using loctite sleeve retaining compound (don't have the number) - the green stuff. Up to about 1600W I think. I've never sanded down a shaft, I was told that shouldn't be necessary - you're putting less surface area in contact..
..a

wollins · Nov 09, 2009, 12:32 AM

Glad this came up ... I just got my Kontronic GB come in and will be attaching it to an ARC 28-58-1 motor.

While there is absolutely no perceptible side to side "play", I can move/slide the pinion up and down the motor shaft with no apparent friction whatsoever. Is this normal or should it be snug on the shaft?

Colin.

WimH · Nov 09, 2009, 03:56 AM

It's normal. Just clean shaft and pinion with aceton or something similar .

Carolynne · Nov 10, 2009, 11:46 PM

Hi everybody

I have a similar problem. I have a Kontonik Fun 500-48 with a 5.2: gearbox and I think that the pinion has come loose inside ( propstrike! OUCH.....). My big problem at the moment is that I cant get the gearbox off to see what is going on. Close inspection shows what looks like some locktite type goo in the area between the back of the gearbox and the front of the motor.

Any good suggestions on how a girl could get this loose? Or should i just pass it across to the engineers to fix?

Carolyn

Thekid3418 · Nov 10, 2009, 11:49 PM

Heat and twist if memory serves correctly. Should come off fairly easily

flying evader · Nov 11, 2009, 02:27 PM

removing a tightened kontronik gearbox with base hands can be difficult, even with no glue..

I've used pressure pliers with cloth over the GB as to not damage..

wollins · Nov 11, 2009, 03:47 PM

Ok this is about putting it on as opposed to removing it.

Should I just use the blue threadlocker loctite for this purpose?

Colin.

Carolynne · Nov 11, 2009, 06:25 PM

Well, I have tried some heat and some covered grips, all to no avail. So, recognising that I am at the limit of my competency, the motor is now going to go on a trip back to the fatherland where this can be fixed properly.

Carolyn

Oct 31, 2009, 06:54 PM	#16
David H Registered User Join Date: Aug 2004 Posts: 762	PHP Code: `Yes, if you heat them beyond 170 degrees Fahrenheit (80 degrees Celsius) the magnets will quickly loose their magnetic properties` Steve whilst I agree using a soldering iron on the armature is not necessarily a good idea. There are several grades of NdBFe magnets some have max operating temps of 180C. The max N rating available in the magnets is lower for the higher temps. Steve Neu recently said that he was using the 180C max operating temp magnets, previously he had been using 150C, probably because the strength he was after was not available in 180C originally.

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Oct 31, 2009, 06:54 PM	#17
Dbox One Idiot is plenty... Join Date: Jun 2005 Location: Planet Earth Posts: 2,682	Steve,try to heat up the magnets through 3.2mm shaft to even half of the not recommended temps and THEN REPORT. Yuri.

Nov 02, 2009, 06:51 AM	#19
Andy W That sickening crunch.. Join Date: Jun 1999 Location: Marietta, GA Posts: 39,809	Any chance the pinion is not the exact size? ..a

Nov 03, 2009, 05:44 PM	#20
flying evader Back in the game Join Date: May 2006 Location: DFW, Tx Posts: 1,223	i think it is.. the shaft size is the same as the fun 500.. 3.17mm

Nov 05, 2009, 06:58 AM	#21
Andy W That sickening crunch.. Join Date: Jun 1999 Location: Marietta, GA Posts: 39,809	Not had to do it often, but I've never had a pinion come loose using loctite sleeve retaining compound (don't have the number) - the green stuff. Up to about 1600W I think. I've never sanded down a shaft, I was told that shouldn't be necessary - you're putting less surface area in contact.. ..a

Nov 09, 2009, 12:32 AM	#22
wollins "ARF LOVER" in Toronto! Join Date: Aug 2004 Posts: 869	Glad this came up ... I just got my Kontronic GB come in and will be attaching it to an ARC 28-58-1 motor. While there is absolutely no perceptible side to side "play", I can move/slide the pinion up and down the motor shaft with no apparent friction whatsoever. Is this normal or should it be snug on the shaft? Colin.

Nov 09, 2009, 03:56 AM	#23
WimH Wrong side of the blue Join Date: Dec 2001 Location: Aalst,Belgium Posts: 4,475	It's normal. Just clean shaft and pinion with aceton or something similar .

Nov 10, 2009, 11:46 PM	#24
Carolynne Registered User Join Date: Apr 2007 Location: Sydney Australia Posts: 92	Hi everybody I have a similar problem. I have a Kontonik Fun 500-48 with a 5.2: gearbox and I think that the pinion has come loose inside ( propstrike! OUCH.....). My big problem at the moment is that I cant get the gearbox off to see what is going on. Close inspection shows what looks like some locktite type goo in the area between the back of the gearbox and the front of the motor. Any good suggestions on how a girl could get this loose? Or should i just pass it across to the engineers to fix? Carolyn

Nov 10, 2009, 11:49 PM	#25
Thekid3418 The Kid Join Date: Dec 2007 Location: Detroit, MI Posts: 1,832	Heat and twist if memory serves correctly. Should come off fairly easily

Nov 11, 2009, 02:27 PM	#26
flying evader Back in the game Join Date: May 2006 Location: DFW, Tx Posts: 1,223	removing a tightened kontronik gearbox with base hands can be difficult, even with no glue.. I've used pressure pliers with cloth over the GB as to not damage..

Nov 11, 2009, 03:47 PM	#27
wollins "ARF LOVER" in Toronto! Join Date: Aug 2004 Posts: 869	Ok this is about putting it on as opposed to removing it. Should I just use the blue threadlocker loctite for this purpose? Colin.

Nov 11, 2009, 06:25 PM	#28
Carolynne Registered User Join Date: Apr 2007 Location: Sydney Australia Posts: 92	Well, I have tried some heat and some covered grips, all to no avail. So, recognising that I am at the limit of my competency, the motor is now going to go on a trip back to the fatherland where this can be fixed properly. Carolyn