RE: MOT's as Isolation Transformers - Follow Up

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Matthew

Yes its not hard. I cut through the welds with a hacksaw and knocked the I
off the E with a hammer and oak stick. One at a time, I locked each coil in
a frame (kind of hard to describe) and used a small hydraulic jack to push
the core off the coils. Lubrication oil was used make it easier for the
coils to slide along the core. Also padding was used to prevent damage to
the coils. 

I did not notice the HV coil was not grounded to the core. When I connected
the core to that of another MOT, an arc occurred between the bottom of the
HV coil and the core. After removing the HV coil, I removed the about three
layers of bottom turns. After insulating the bottom of the coil, the MOT was
back in service. Unfortunately I had to remove the primary to get at the
secondary. I had to save the MOT because it was almost identical to the
other MOT. 

Godfrey Loudner     

> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Tuesday, June 04, 2002 12:10 AM
> To:	tesla-at-pupman-dot-com
> Subject:	MOT's as Isolation Transformers - Follow Up
> 
> Original poster: "Matthew Smith by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>
> 
> Hi All
> 
> Further to previous postings regarding using MOTs either a) back to back 
> or b) with two primaries on one core as isolation transformers:
> 
> I thought I'd try most difficult route first ;-)
> 
> Removing the windings from an MOT is not really all that difficult 
> provided that a) the 'bar' of the core is under the primary and b) you 
> don't mind the possibility of damaging the secondary...
> 
> 1) 
> Angle grinder to remove welds
> 2) 
> Hammer (gently) to remove 'bar' from 'E' of core
> 3) 
> Construct small hydraulic press from the bottle jack
> 	out of my 4x4 and some 50mm x 50mm x 1.6mm box section.
> 4) 
> Press core out of windings
> 
> Building the press isn't impractical as it sounds - I did it with 
> self-drilling bolts and plate cut from the base of a microwave oven, so 
> this took me about an hour or so.  If you've got a welder, call it ten 
> minutes ;-)
> 
> Cheers
> 
> M
> 
> 
>