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RE: Plettenberg maintenance? - 2/26/2012 8:21 PM   
nonstoprc



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Status: offline 		Thanks for the pictures.

Wonder if you can make a "sizable" hardwood dowel that matches the OD and the shape of the ring perfectly from the back side, and use it to gently hammer the ring out. The bearing has to be sit on a wood block with the round cutout in the middle to allow the ring to pass through.

You may freeze the assembly. Maybe it helps the process.

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RE: Plettenberg maintenance? - 2/26/2012 8:25 PM   
wagen017


 

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Status: offline 		Interesting. On my 30-10, it just fell off. Can't imagine on the 30-09 it is a different design.

You might want to check with Plettenberg if they can send you a spare one. It can't be a very expensive part.

It might actually be that if you heat it, the ring will expand more then the bearing, because it is not a very hard metal. So, following that logic you might want to put it in the freezer. Maybe then it comes out easy.

Volkert

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RE: Plettenberg maintenance? - 2/26/2012 8:34 PM   
Jason Arnold


 

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Status: offline 		Have you tried heating the whole assembly up? The centre part may have a different expansion characteristic. Also, you could try using sockets to press it out on a vice. A big socket on the back and a smaller one to push the part through the bearing. If that fails, have a dremel party with it... :-)

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RE: Plettenberg maintenance? - 2/26/2012 8:50 PM   
dando


 

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Status: offline 		Guys, thank you all!
nonstoprc, that's just what I tried when I was on it a few weeks ago. Maybe the diameters of the dowels weren't that perfectly sized.
wagen017, Plettenberg didn't have any available, but quoted about 12 euros for the ring + 5 euros for regular shipping to Bulgaria. Maybe this would be a nice bet, because I bent and then straightened the original one, despite so far the motor seems to be running axially.
Aussie_Knife_Edge, I may try the heating or freezing method. I don't have a Dremel

Thanks!
Nickolay

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RE: Plettenberg maintenance? - 2/26/2012 8:54 PM   
wagen017


 

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quote:

ORIGINAL: dando

Aussie_Knife_Edge, I may try the heating or freezing method. I don't have a Dremel




hahaha!!! Dutchie says put it in the freezer, Aussie says heat it! I guess it has been a long winter here and a long summer there!!

cheers!

volkert


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RE: Plettenberg maintenance? - 2/26/2012 9:20 PM   
Jason Arnold


 

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Status: offline 		If all else fails, use a BFH (Bigger Fcuken Hammer)....

Seriously, consider using the big and small sockets in a vice. It will ensure things are pushed out squarely.

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RE: Plettenberg maintenance? - 2/27/2012 1:59 AM   
cmoulder


 

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quote:

ORIGINAL: dando

Guys, thank you all!
nonstoprc, that's just what I tried when I was on it a few weeks ago. Maybe the diameters of the dowels weren't that perfectly sized.
wagen017, Plettenberg didn't have any available, but quoted about 12 euros for the ring + 5 euros for regular shipping to Bulgaria. Maybe this would be a nice bet, because I bent and then straightened the original one, despite so far the motor seems to be running axially.
Aussie_Knife_Edge, I may try the heating or freezing method. I don't have a Dremel

Thanks!
Nickolay


It doesn't matter if you damage the bearing, so just cut it out with a bolt cutter.

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RE: Plettenberg maintenance? - 2/27/2012 2:29 AM   
nonstoprc



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Status: offline 		If the ring serves the purpose of preventing something from moving, it may be a construction of aluminium. Assume the bearing is stainless steel, then freeze the whole assembly first as I suggested should help.

< Message edited by nonstoprc -- 2/27/2012 5:51 PM >

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RE: Plettenberg maintenance? - 2/27/2012 5:30 PM   
dando


 

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Status: offline 		Guys, thank you!
I hope to have some spare time for trial during the weekend and will post back my results.

Thanks!
Nickolay

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RE: Plettenberg maintenance? - 3/3/2012 2:34 PM   
dando


 

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Status: offline 		Hello all!
I tried freezing the assembly for a few hours and then putting it along with some nicely aligned round wooden blocks in my vice, but that didn't help.
What would you recommend? Maybe heating it all in an oven? But at what temperature?
The ring is not made from aluminium, I think.

Thanks!
Nickolay

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RE: Plettenberg maintenance? - 3/3/2012 3:11 PM   
nonstoprc



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Status: offline 		That is too bad. They may have applied some locking compound before putting the ring on. Maybe lightly torch the boundary line?

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RE: Plettenberg maintenance? - 3/3/2012 8:11 PM   
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Status: offline 		Dando: The thermal expansion of aluminum is greater than steel. This means the aluminum case holding the bearing will expand more than the steel bearing when they're heated. When changing bearings in 2/4 stroke motors, the aluminum case is heated, not frozen. Years ago, prior to my transition to electric, I used a 300 degree oven to heat the engine crankcase. Afterwards, the bearings would normally just drop out of the crankcase. Suggest you place the Plettenberg backplate/bearing in the oven for a while and heat it. Alternatively, you can use a propane/butane torch to heat the aluminum. You shouldn't need to apply the heat for too long, just long enough to get the aluminum hot. The bearing should be much easier to remove. When you install the new bearing, get the aluminum hot and the new bearing should slip right in.

Mike

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RE: Plettenberg maintenance? - 3/10/2012 2:58 PM   
dando


 

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Status: offline 		Guys, thank you all!
Today I made some tests. I used our kitchen oven. First, I set it to 200 ⁰C and put the assembly in it for about 5-7 minutes. I tried to separate the ring and bearing, but I didn't manage to. I then tried 300 ⁰C, but that didn't help too, maybe I didn't wait enough. Finally, on the third approach at 350 ⁰C (the maximum temperature of the oven) and some more time in it, I could hammer gently the ring out, using the round wooden blocks. It seems the bearing and ring were glued together.
I have another concern, though. On the pictures you could see the ring changed it's color to much darker. Maybe an oxide built up. Do you have any recommendations on how to clean it or I should buy a new one? I'm thinking about some alcohol and maybe acetone to clean the glue residue. Afterwards, if the new bearing doesn't fit, I'd have to heat the ring again and try again, but I'd like to get it cleaner first.

Thank you!
Nickolay

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RE: Plettenberg maintenance? - 3/10/2012 5:12 PM   
nonstoprc



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Status: offline 		Good to know that you have taken the ring off.

To mount it, you may need to consider the same mount method with good high-temperature locking liquid. The ring probably should be put in the freezer prior the mount.

The 350 degree heat should destroy the integrity of the glue and maybe you could lightly sand it clean with 400grit sand paper?

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RE: Plettenberg maintenance? - 3/11/2012 3:53 AM   
NJRCFLYER2


 

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quote:

ORIGINAL: klhoard

.
Try to do that with a YS . . .
.

I made it to about 400 flights before getting the rear bearing replaced in one of my 170 DZ's.  Probably should have stopped at 350. 

Hey Keith, you may be interested to know that I finally have a 2M electric bird almost ready to go. Might be ready to fly tomorrow if I can stay awake a few more hours.   I'm slow rolling my transition to coal powered pattern.  I'll wear all the metal off the cylinder linings of my 5 170's before I buy switch over to e-power 100%!  I just like the 4C sound and smoke trail too much to let it go all at once.  And to think, just 2 years ago all I flew was 2C glow.

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RE: Plettenberg maintenance? - 3/11/2012 4:22 AM   
icicles


 

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Status: offline 		5 x 170's wow.
I thought you only needed 3. Fly one of them, the other is in transit going to be repaired and the last one is coming back from being repaired.

Sorry i couldn't help myself

Chris

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RE: Plettenberg maintenance? - 3/11/2012 4:38 AM   
NJRCFLYER2


 

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ORIGINAL: icicles

5 x 170's wow.
I thought you only needed 3. Fly one of them, the other is in transit going to be repaired and the last one is coming back from being repaired.

Sorry i couldn't help myself

Chris

Actually, you can get them for a song now that you guys have all flipped to coal power.  So I did.  Nice to have spares, eh?

I've never seen a glow motor spontaneously combust
I've never seen anyone eject their fuel tank through the canopy
I've never had a fuel tank "puff" on the 2nd to last maneuver in the sequence at the Nats. Or any other time, for that matter.
My fuel supply doesn't make noise in the pits between rounds.  I also don't have to rescue it when it starts to rain while I'm judging a round (just the airplane and transmitter)

Almost forgot!  I never lose sleep worrying if I will make weight! 

OK, here we go!

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RE: Plettenberg maintenance? - 3/11/2012 12:54 PM   
cmoulder


 

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quote:

Hey Keith, you may be interested to know that I finally have a 2M electric bird almost ready to go. Might be ready to fly tomorrow if I can stay awake a few more hours.


Somewhere, pigs are flying.

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RE: Plettenberg maintenance? - 3/12/2012 2:11 AM   
icicles


 

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ORIGINAL: NJRCFLYER2


quote:

ORIGINAL: icicles

5 x 170's wow.
I thought you only needed 3. Fly one of them, the other is in transit going to be repaired and the last one is coming back from being repaired.

Sorry i couldn't help myself

Chris

Actually, you can get them for a song now that you guys have all flipped to coal power.  So I did.  Nice to have spares, eh?

I've never seen a glow motor spontaneously combust
I've never seen anyone eject their fuel tank through the canopy
I've never had a fuel tank ''puff'' on the 2nd to last maneuver in the sequence at the Nats. Or any other time, for that matter.
My fuel supply doesn't make noise in the pits between rounds.  I also don't have to rescue it when it starts to rain while I'm judging a round (just the airplane and transmitter)

Almost forgot!  I never lose sleep worrying if I will make weight! 

OK, here we go!


Yeah, actually you are right i have only ever had one dead stick with my electric pattern models in all my years flying them. And it was my fault. Shouldn't have left the model out in the sun on a tarmac runway, 45 degrees Celsius. The speed controller over temped 2/3 rd the way through the flight.

Never puffed them, never thrown them out in flight. Must be lucky i guess. And i do heaps of flying

Enjoy your YS's

Chris

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