motor repair, shaft not flush in bell - advise needed

[p-air-o]

Hi all,

last weekend I sort of landed my ryan pt-20 nose down on the flying field. Thank god the plane itself was not badly hurt. The motor however got quite beaten up. When trying to move the prop, there was sort of a scraping sound. Since there were no lose parts (magnets, etc.) I thought this is going to be an easy repair - so I ordered new bearings and a new shaft. The problem stil persists. What I found out is that shaft is not 100% flush connected with the bell/can. If the motor is put together the open end of the bell can be moved about 1mm. Thats the area where ther is the scratching (marks at the magnets). Bearings and shaft are flush and tight, btw.

Does anyone have an idea how to fix this? Is it possible to fix?

Tnx 4 your help
P-air-o

 

[Foam Addict]

Do you have a vice or C clamp? If so, you will want to remove the shaft from the Stator, and press it into the bell of the motor using the vice.

Is this what you need to know? If not, just ask!

 

[p-air-o]

Hey Foam Addict,

tnx for your reply. Not quite what I need to know.
The shaft slides quite feely and easy in the mounting hole within the bell. Can be moved around in there. That's the problem I#M trying to fix/solve. Even with the tiny screw that tightens the bell to the shaft, the shaft can be moved around.

Any idea?

 

[Foam Addict]

Hey Foam Addict,

tnx for your reply. Not quite what I need to know.
The shaft slides quite feely and easy in the mounting hole within the bell. Can be moved around in there. That's the problem I#M trying to fix/solve. Even with the tiny screw that tightens the bell to the shaft, the shaft can be moved around.

Any idea?

Hmm, that is strange.
Is it possible that you ordered the wrong diameter shaft and bearings?

 

[p-air-o]

Thought so too at first. Tested all again with a digital caliper exact the same sizes.

 

[p-air-o]

Does anyone know if this is fixable, if yes then how?
Or should I simply give up this motor and trash it?
What would you do?

 

[Foam Addict]

Hmm, what would I do?
I would set the motor in a box and start reading about it.

Perhaps you could find some brass tubing with a tight fit over the shaft that could take up the slack, then sand it so it barely fits in the motor and tighten the set screw. Some locktite should keep the tubing in place.

Frankly I'm at a loss, I'm sorry I couldn't be of more help.

 

[Tactical Ex]

Is one of the magnets loose? I had a magnet become dislodged and the magnetic force stopped the bell from going down all the way and made a weird scratching noise. I had to knock it back in place and glue it.