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        Discussion Reversing an A20-20L EVO

#1 Rob_P Apr 04, 2011 07:16 PM

Reversing an A20-20L EVO
 
I purchased an A20-20L EVO from Hacker Aeromodel at Toledo on Saturday and need to reverse the shaft. First I checked the internet watched a video that shows removal of a circlip. I checked mine over and don't see one.
On the cone end of the motor there are two opposing grub screws. One came out with very little effort and the other didn't really want to move and appears to be rounded (Honestly it was NOT me!). I hit the non moving grub screw with heat from a soldering iron and no change. Then I notice that the gap between the stationary end and the purple body had increased. I found that I was able to pull the fixed end with the windings out of the purple body.
That being done it was easy to push the shaft through and then reinstall the fixed end and windings.

OK I appear to have reversed the motor but now I'm concerned about how easily this thing separates. I can literally pull the purple body and shaft away from the backplate.

In operation are the magnets enough to stop the pull of the prop separating the motor?

Maybe I just have poor tolerances?

If anyone from Hacker is reading this your comments would be much appreciated.

Robert

#2 planewalker Jun 27, 2011 03:47 PM

Same thoughts. Too easy to pull out shaft... Why they made that construct decision? Don't know.

#3 r0sewhite Jul 16, 2011 08:02 PM

On the bottom side the motor shaft should be fixed with an aluminium ring with a grub screw (don't know the english word for it but I'm sure you have one). This ring keeps the shaft from being dragged out. Since the shaft diameter (inner diameter of the ring) is the only important size, I'm sure you will find a matching ring at your local hobby shop.

On the other hand you don't need this ring anymore if you reverse the motor because instead of this ring you will want to mount something like a prop spinner.

#4 planewalker Jul 21, 2011 01:53 AM

Quote:

Originally Posted by r0sewhite (Post 18780407)
On the bottom side the motor shaft should be fixed with an aluminium ring with a grub screw (don't know the english word for it but I'm sure you have one). This ring keeps the shaft from being dragged out. Since the shaft diameter (inner diameter of the ring) is the only important size, I'm sure you will find a matching ring at your local hobby shop.

On the other hand you don't need this ring anymore if you reverse the motor because instead of this ring you will want to mount something like a prop spinner.

Yep, that was mentioned in manual :)
Btw, has anyone problems with shaft pull out during flight? I had 2 times (and I think that's enough), even when the bolts that hold shaft, are tightened at maximum.
Any suggestions? :cool:


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