Siren suicide! (NEVA55 restoration)

[orestis]

Stator and roof made it home. Motor and rotor stayed behind. To pull out the rotor, the motor has to be in vertical position. And this is the real issue, since the nuts that hold the motor foot on the tripod are totally corroded and stuck. Even tried with a (very expensive!) nut splitter tool with no luck. The nuts position doesn't allow the tool to cut the whole thing. Besides I can't use a cut-off saw because the parts are surrounded by dry grass...

[Chem_Boffin_6589]

Why don't you weld another nut to the corroded one to get more purchase on it?

[orestis]

Why don't you weld another nut to the corroded one to get more purchase on it?

That could work if the parts were in a garage and had access to a welder. But they're still outdoors and surrounded by bushes... Plus high temperature, branches, mosquitoes... the conditions are really bad. I'll try with a metal hand saw as well.

[Wdr]

if they are small enough you might be able to just snap the bolt with enough leverage.

[orestis]

The bolts were cut with a hacksaw. The motor and rotor made it home as well, and the siren is waiting to be restored!

[Stormsetter4]

Dang, that thing really got beat up.

[orestis]

Dang, that thing really got beat up.

It has fallen from the third floor! I wonder if the shaft can be straighten out.

[connerdstines]

Dang, that thing really got beat up.

It has fallen from the third floor! I wonder if the shaft can be straighten out.

Probably not, it would probably just snap. Even if you did the shaft would still be slightly of center and weakened, and imbalance with that rotor spinning that fast is extremely dangerous. Your best bet would be to dig and see if you could find the same, or at least similar motor design somewhere. At least with american sirens, most sirens are powered by ordinary motors with really nothing special about them.

[orestis]

Dang, that thing really got beat up.

It has fallen from the third floor! I wonder if the shaft can be straighten out.

Probably not, it would probably just snap. Even if you did the shaft would still be slightly of center and weakened, and imbalance with that rotor spinning that fast is extremely dangerous. Your best bet would be to dig and see if you could find the same, or at least similar motor design somewhere. At least with american sirens, most sirens are powered by ordinary motors with really nothing special about them.

Maybe the company could provide me with a spare motor rotor of that type. This is a special motor manufactured by VILMA exclusively for NEVA55 until 2000 or so. (7.5hp) New models (VILMA55) use ordinary motors.

[TboltTX1]

I wonder if it would be possible (or practical) to find a machine shop that can make a new motor shaft and just move the old armature and rotor over to the new shaft?

Edit: Looking back at your last photo it appears the motor has separated a bit from the base plate. It may be prudent to take the motor over to a shop and see if the field and frame is still intact before trying to salvage it.

Does the rotor or stator have any cracks from the fall?