Impact Transfer

Depends what is retaining the laminations. If the casting is interfering/grabbing them in the middle of the stack, they may still pull apart.

That is a possibility, the laminations are staked/welded pretty well.

I think this would work if I knew the hydraulic cylinders could withstand it. Those hydraulic pile driver are pretty tough.

Heat the cast iron thoroughly then chill the laminate stack with ice or butane, etc.

Why do the stator laminations need to come out of the main cast iron motor frame and then go back in again?

Also I would be concerned about using hard impacts to remove the laminations being cast iron is rather brittle and will easily crack when struck hard.

Do you have aphot of this or a URL for similar.

Not sure I have no idea what your last para is trying to ask. Sorry.

For quickly and evenly heating an outer housing to allow an interference fitting inner to drop out then induction heating comes to mind. Dead blow hammer to get things jiggling out sounds fine.

These motor units range from 8-70 kW. The cast iron housings are very thick. I have to preserve the stators, they are new and this operation involves changing from 230/460v to 575/600v. I have tried the cooling stator/heating housing with some success but it is labor intensive. What I want to try is using an acetylene-glycol heat source and a fixture using hydraulic shock in a upward thrust around the perimeter of the base of the housing to allow the stator to move down and out of the housing through a opening in the fixture. The force would be distributed evenly around the perimeter of the housing. I thought of using four slave cylinders against a heavy plate to distribute the force. The master cylinder piston would be struck by a soft face dead blow hammer. The hydraulic ratio would be 1 : 1. I just can't find information on impact hydraulics and if say, the small pancake cylinders available, can take the dynamics involved. I can post illustrations on Monday. Anyway thanks for everything so far.

Posted from an IPad and for some reason, the paragraph spacing gets lost.

So why do the stators need to come out for a rewind job?

That's not a process I am familiar with.

First, I apologize for taking so long to reply, My screen was blank for CR4 all weekend and this morning at work. It came up just now.

These are new pumps, with new stators to be exchanged. even if they were to be rewound, the cores cannot be damaged. The motor shops use an expanding mandrel on a hydraulic puller, together with heat. this mandrel sometimes damages the core where it contacts the lower edge of the bore I.D.

"My screen was blank"

I did that.

Sorry.

I had intended to play a trick on DoorMan with my latest invention, the ScreenBlocker™ Trixter.

But, I hit the "global" button instead of the single user button and didn't realize my mistake until this morning.

Look at the bright side, no spam all weekend.

Not a problem, I was due for a visit to the optometrist anyway and my screens needed cleaning. At&t broadband never believes me anyway. It was about time I got a new laptop anyway.......

Here is a sketch I made:

Induction heating is the easy way

See here and adapt to your needs.

Stator just falls out, no impact was required.

Setup looks like this.

Thanks Wal, the housing in that demo is aluminum, but I will investigate using induction for cast iron housings.

I found this searching "pulse hydraulics" it is used on paving machines for compaction. :

Looks like your trying to shake it out with some "tapping" and gravity.

Induction heating works on ferrous and non ferrous metals.