Siren suicide! (NEVA55 restoration)

[Wdr]

Here's the setup I used on mine, the wire was to keep the puller from tipping sideways.

[orestis]

Maybe this aluminium is too soft, I tried with thicker thread eye bolts that were really tight when inserted. The bolt came off at once breaking the thread after a while. I don't know if it is worth to cut new threads to try with larger bolts...

[Wdr]

Darn! Have you heated it and put some sort of penetrating oil? I heated, sprayed, heated more, then more oil, then tightened the puller and let it sit overnight. It came off after tapping and more heat.

[orestis]

Darn! Have you heated it and put some sort of penetrating oil? I heated, sprayed, heated more, then more oil, then tightened the puller and let it sit overnight. It came off after tapping and more heat.

It is flooded with penetrating oil. Unfortunately I don't have a torch. The eye bolts are now tightened and secured with small wooden pieces and I have repeated the procedure. At maximum tension the bolts seem to be okay, but the rotor stays always in place. I don't think I can apply more force.

I have extracted many rotors in the past with a puller and I wouldn't say it was a difficult task. I'm thinking that the shaft distortion has somehow clamped the rotor.

EDIT: the bolts came off again, I have to find another way to pull it out.

[Wdr]

If you could support the back side of the rotor maybe place a rod on the shaft and hammer it out? And I just used a propane torch, not an oxy acetylene.

[orestis]

If you could support the back side of the rotor maybe place a rod on the shaft and hammer it out? And I just used a propane torch, not an oxy acetylene.

Do you mean support the rotor and let the motor hang below when the shaft is hammered? That could work I suppose... Anyway I'm considering to visit a machine shop to do it for me (I know, this is a small defeat!), and also replace the bent shaft, if possible.

[Wdr]

Yes, that's what I meant. I'm thinking its not quite defeat and makes sense to have the shop do it since you need a new shaft anyway. I do recall reading that when having shaft work done on a motor make sure the shop knows motors because the shaft can only be pressed out one direction which is hard to tell.

[orestis]

Yes, that's what I meant. I'm thinking its not quite defeat and makes sense to have the shop do it since you need a new shaft anyway. I do recall reading that when having shaft work done on a motor make sure the shop knows motors because the shaft can only be pressed out one direction which is hard to tell.

Thanks for the advice! They told me there's another way to fix it, without replacing the whole shaft, by cutting the bent piece and implement a new one somehow. And then of course we have bearings and balancing, maybe I should go to a motor shop as well, we shall see.

[Wdr]

I was looking into welding, sleeving, or extending a motor shaft for something(don't recall what).. I believe the general consensus in my research was that it was a bad idea and would be liable to break off.. But I could be remembering wrong, just another thing to consider.

[orestis]

The machine shop has finally pulled out the rotor. It was badly stuck because of the shaft distortion and had to be pressed. The guy told me he applied over 8 ton force to extract it! No wonder why it wouldn't move with the puller! Next step is the shaft replacement.