Stator removal

[Stolla]

Quick and easy way to remove stator on scorpion motors, see pics self explanatory, once bolts are in and a little under tension place in oven at 150c for couple mins then just tighten bolts litlle by little one by one

[powercroco]

we found, the best is to cool them down as low as possible to remove the packages from the holder.

[ZuvieleTeile]

Originally Posted by powercroco

we found, the best is to cool them down as low as possible to remove the packages from the holder.

You think the aluminum holder shrinks more than the iron stator.
Hhmm, could be something to it.

[powercroco]

believe it - this is tested often, it works much better than heat. -30°C are really ggod.
also the glue will become demure? brittle? chapped? - what ever the right translation is.

in addition you need a hammer and a long enough tool which fits into the bearing seat with its bigger diameter and into the statorholdertube with its thinner diameter.

[ZuvieleTeile]

[quote
. . . .
in addition you need a hammer and a long enough tool which fits into the bearing seat with its bigger diameter and into the statorholdertube with its thinner diameter.[/quote]

You mean recessed. Something like this?
Yeah, good idea, the recess would prevent damaging the soft stator holder. . .

[powercroco]

yes.
but it shoudn't be harder than the statorholder (aluminium!) and it must fit by 1/10mm into both diameters!

[HeliFX]

i feel heat has more adverse effects to dissolving the epoxy.

I'm certainly going to try cold method.

"powercroco" would placing stator in freeze for 10 minutes sufficient time ?

also is best to wait until it reaches room temperature before tapping it out ?

[powercroco]

as long until the package is cooled down - may be some hours.
and than you should work immidiately.
you will need a glove to hold the very cold package -otherwise you will get nice freeze bubbles

[Blades_Cuts]

10min is way too short. I usually do it overnight. If it doesnt work for 2 days, your freezer might not be getting cold enough. Maybe try "dry ice", although I have not tied that yet. As cold as it is, you might get it to work in a few minutes to an hour. Set the mounting side on the dry ice so the aluminum would shrink quicker that the iron stator.

[HeliFX]

overnight ok sounds good.

I think it really depends on the motor and make.
Align motors have not glue --- so its just a press fit.

is it a safe assumption that scorpion motor are epoxy into place ?

Originally Posted by Blades_Cuts

10min is way too short. I usually do it overnight. If it doesnt work for 2 days, your freezer might not be getting cold enough. Maybe try "dry ice", although I have not tied that yet. As cold as it is, you might get it to work in a few minutes to an hour. Set the mounting side on the dry ice so the aluminum would shrink quicker that the iron stator.

[Blades_Cuts]

It's never safe to assume. Always check and double check.

[HeliFX]

apart from the removal how about assembly ?

is it press back in with epoxy and piano wire ?

or

no epoxy press fit and taped with M2 screw

Originally Posted by Blades_Cuts

It's never safe to assume. Always check and double check.

[_Dekker]

Yes, cold is the way to do it:
When heated, aluminum will expand about twice the amount that steel does. So heating it up will only make things worse: the aluminum will be a real tight press fit in the stator.
Also the Scorpion "epoxy" used can handle high temperatures really well, don't expect it to become soft
I have tried the heat method with the screws pushing but ended up warping the stator...

[ZuvieleTeile]

HeliFX got his Align stator off easy.
I tried it yesterday on the 700 MX stator with the freezing method. No luck so far.
If there would be a little bit more room between the stator/winding and the mounting bracket, I could squeeze in a metal plate and then push it out with an arbor press.
Same would go for Stolla's method, not room enough on the MX.

Any ideas guys???

[Blades_Cuts]

Maybe try The De-Stator-inator from this rc forum: rcgroups.com/forums/showthread.php?t=1547568 (cut and paste to your browser)

[powercroco]

steady!

if you have a motor with screw protection by steel pin (like the scorpions all have) you will only destroy the motor with this tool.

[Blades_Cuts]

Originally Posted by powercroco

steady!

if you have a motor with screw protection by steel pin (like the scorpions all have) you will only destroy the motor with this tool.

I was gonna add that. But I forgot.

[ZuvieleTeile]

Originally Posted by powercroco

steady!

if you have a motor with screw protection by steel pin (like the scorpions all have) you will only destroy the motor with this tool.

It's the Align 700-MX. Allegedly no pin and now grub screw.
Your friends in Germany pushed it out after a short freeze only.

[ZuvieleTeile]

Still can't remove the Stator from the 700 MX.
This guy is really stubborn.
Must be one of those with more glue/epoxy/loctite.
Tried the above mentioned method, but am afraid to use too much force.
The Stolla method did not work either. I fabricated some small pieces of aluminum about 3mm thick and filed them down, that I could slip them into the motor underneath the bracket screws. Still not going to work.
Now back to the cooling method.
I read an article to my Missus, that there are bacteria and Viruses, which resist to die in a freezer with average temperature. So I was allowed to set the freezer lower. . .
Now I am giving the 700MX a real chill for some hours.
Maybe that helps.
The first try yesterday with just 15 minutes did not help.

[Stolla]

Try the screw method with freezer and see if it works, i've removed many scorpion 4035 and recently a 50 20 this way using oven at 150c and they slipped out very easily, key is to turn only about half a turn per screw and crosswise to keep equal pressure. This way you wont get any damage to stator,
My mx is on the way so i'll see