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550 Class Electric Helicopters 550 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 09-09-2010, 04:57 PM   #1
philipfrank
 

Join Date: May 2004
Location: ft, worth
Default How to reattached motor shaft in the Neu 1907

Due to numerous pm’s and such on this subject,

If your shaft comes loose from the motor you can do this:

Remove the 4 screws from the silver shroud at the bottom of the motor and remove shroud.

Very gingerly, use a razor blade if needed to begin separating the bottom cap on the can. Then use a small screw driver to pry cap off, gently.

NOTE: Remove cap slowly and make note of the number of shims on the lower end of the shaft.

Set cap and shims aside.

Pull the shaft and magnet core from the inside of the motor. Due to the strong magnets you will need to wrestle to get it out.

NOTE: Take note of the number of shims on the top side of the shaft and set them aside.

You should be able to tell where the magnet core was attached to the shaft by looking at the shaft and were it was bonded in the initial assembly process.

Apply 3 or 4 drops of Loc-tite 680 to the shaft and slide the core on the shaft into position. Clean excess Loc-tite from shaft.

Loc-tite 680 takes 100 hours to cure properly at ambient temps.

There are only 3 moving parts to the motor so it is an easy process. (2 bearings 1 shaft)

Once cured, put shaft and core back in the motor with the shims in the same position that they were removed from.

Place cap on bottom of motor, install silver shroud and install the 4 screws.

Loc-tite 680 is designed for exactly this type of assembly. You can google Loc-tite 680 and read the specs.

I did this to my motor about 20 flights ago and it is holding well.

also note the size of the bearings. bigg'uns.

Last edited by philipfrank; 09-09-2010 at 09:29 PM..
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Old 09-09-2010, 05:09 PM   #2
TJinGuy
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Could you place the Loc-tite'd core/shaft in the oven at 200-250F to speed up the curing process?
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Old 09-09-2010, 05:38 PM   #3
philipfrank
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i believe so.

If you look at the data sheet on Loc-tite 680 (google) i believe it talks about accelerating the cure time.

not sure if the magnet would like it but maybe.
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Old 09-09-2010, 05:42 PM   #4
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I bet the magnet would be fine at that temp and maybe even higher.
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Old 09-09-2010, 05:45 PM   #5
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ok.
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