Electro Magnetic Chuck

Steve@Advance

Well-known Member
Anyone worked on an electro magnetic chuck?

This is on a surface grinder. Works on 115 vdc.

I had to take it apart to replace the power cord. It is run through a hole in the side of the base, sealed with a clear shellac looking sealer.

The entire base appears to have been sealed with this clear sealer. There are 2 sets of windings, they just lay in the base. When the top was put on, some of the sealer came in contact with the cloth insulation on the windings. When I took the top off, it pulled some of the insulation off of the windings. The wire appears to be intact, they both ohmed out the same, so I thing they are OK internally.

The insulation appears to be just a canvas looking material, wrapped, but not sealed to the wire. I'm thinking repair the damage with some cloth electric tape, if I can find any.

I also need to reseal the top back on, around all the bolts, and seal where the power cord enters. This is subject to being flooded with water base coolant, so everything must be sealed water proof.

I am thinking JB weld where the cord enters, as there is no strain relief, just a hole drilled through the base, about 1/2" thick. And it gets a real workout as the table moves back and forth. I may drill and tap that and add a strain relief, think that would be a plus.

Any idea what the sealer is? I don't want to use epoxy, I would never get it apart again. Silicone?

What about the cloth tape? Good,bad, alternatives?

Thanks!
 
I'd use silicone. There is a spray insulating type paint that is usually red rebuilders spray on field coils. Eastwood may sell it or a local starter shop.
 
What you may be thinking of is "Gliptol" (SP).It is a product made by General Electric. The product is used in the electrical generators and other similar components.
 
I got a spray - on product called Aervoe Industries Toolmates Insulating Epoxy Coating from KBC. IT is recommended for field coils, frayed insulation, windings and a bunch of other things. I haven't tried it yet, but it reads like it should work. For cloth tape, I use cloth hockey stick tape. It's available at the hardware store in different colours, and is like the old timey friction tape. I got this stuff to re-do the field coils on a generator, but haven't got it back together yet. Good luck. unc
 

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