On Sep 21, 8:50*am, geoff wrote:
In message , Andrew Mawson
writes





"robgraham" wrote in message
....
On 20 Sep, 22:41, "Andrew Mawson"
wrote:
"robgraham" wrote in message

....

I've the task of running a Harrison wood turning lathe with a 3/4
hp
3ph motor on single phase.

I've an electronic box which converts 240v single phase to 240v 3
phase and I've had running a modern 3ph motor, but the motor from
the
Harrison lathe ( Griphon from Brook Motors) is an old one and is
connected in star configuration for 415v operation.

Has anyone tackled taking an older motor such as this apart to get
access to the coil ends and reconnect as a delta connected motor?
I
can't imagine that motors of this age - possibly 60 years old -
are
that much different in build but I don't have quite the confidence
I
had in my teenage years for taking things apart and getting them
back
together again successfully so I'm looking for some words of
encouragement!!

Thanks
Rob

Rob,

Yes I've done it - it's fiddly and if the coils are shellac'd (which
they probably are) it makes getting the thing apart 'interesting'.
Make sure that you use wire and sleeving that will stand the
temperature and both lace it and shellac it to ensure no fretting.
The
bigger the motor the easier it is. Smallest I've done was the suds
pump on a Colchester Student lathe - 1/6 hp iirc - all a bit tight
in
there!

AWEM

Hi Andrew
Do I take it that you withdraw the rotor and work inside without
removing the coils ? *Shellac I have in the form of I use for French
Polish - I take it that's the correct form? *But what is suitable for
the re-lacing ?

I was just thinking that gentle application of meths will ease off the
existing shellac.

Many thanks - these are just the words I was looking for.
Rob

Yes, rotor out and work on the coils. I wouldn't use meths - itmay go
further than you want - just gentle teasing out with a scalpel blade.
Use strong cotton for lacing, not plastic

I've got a reel of lacing cord if someone wants a few metres

--
geoff- Hide quoted text -

- Show quoted text -

Or you could perhaps use that stuff for cleaning your teeth; er, er.
got it! "Floss'. But waxed lacing twine is easier to use.