Re: what will i damage?..running 220 1ph into220 3phase transformer?

Did approximately the same on mine with similar results. Rapids were
even faster if I remember right.

Mill currently under reconstructive surgery ;-(

Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <les@l...> wrote:
> Hi David,
>
> So far I have had no problems with my Geckos at full current and
75V.
> They do need reasonable heatsinking though. I used a 300mm x 200mm
piece
> of 3mm ali plate with all 3 drives on it. There is another thin ali
> plate mounted about 20mm away from this plate and a 80mm fan blows
air
> between the two. It runs slightly warm to the touch.
>
> I easily get 96IPM rapids without losing steps. I have also never
> noticed any lost steps while taking heavy cuts.
>
> How have you got your steppers wired up? I noticed a significant
> improvement when running the motors with just 2 windings as opposed
to
> series or parallel.
>
> If servos weren't so expensive I would scrap the steppers as well.
I
> much prefer servos.
>
> Les
>
> ibewgypsie wrote:
>
> > I did not have success with gecko drives on my bridgeport. IF YOU
do run
> > them make sure to heat sink them with a fan. I lost 4 total...
Larken Cobra
> > drives are much more suited to the Nema 42 motors and I run mine
at 8 amps
> > and get 110 ipm out of it. NEVER could I get that speed from a
gecko on the
> > system without losing steps. DON'T get me wrong, geckos are fine
drives
> > just a nema 42 stepper is on the upper thresh hold of the
drive... USE
> > maximum precautions with heat and current voltages.. That heavy
slide will
> > generate enough decell-inertia related voltage to kill them
drives also. If you
> > limit the current to 6.5 amps and keep them drives cool you might
be able to
> > run 30-40 ipm... IF anyone is running faster then this with this
setup I want to
> > see it. Look to lose steps under heavy cuts with this setup.
> >
> > Someone on another board equated this to running a YUGO motor in
a
> > corvette. Made fun of me for even trying out geckos on my mill..
> >
> > I rewired the taps on the 3 banks of stepper transformers about
ten or more
> > times trying to find something that would work with single phase,
I didn't.
> > They need to be seperated cause the 3rd coil on the common
armature will
> > affect it.. YOU could try using two of the coils on the bank and
ignore the
> > third, not sure what that'd do.. I kept ending up with a odd
voltage on the 3rd
> > coil.. I have heard of people cutting the armature in between the
coils and
> > they work fine..
> >
> > I replaced the transformer bank with a 2kva 220/24+24=48vac
transformer.
> > Still running fine with Larken drives and that setup.. I have
lost a bridge
> > rectifier. Seems not all of them are as good as some of them.
Current model
> > is a 35 amp IOR 600 volt. I have 4 100amp stud mount diodes
mounted and
> > ready if I have another bridge go out..
> >
> > Lots of good parts inside that boss setup to reuse. Them
capacitors are
> > great. Terminal strips, 220/120 transformer, 24 volt system
switches and
> > other goodies..
> >
> > I had pictures posted on the net of my machine, but I deleted
them to make
> > room for some ebay items. I can repost them next week probably if
you'd like
> > to see how I skinned a cat. There is more than one way you know..
> >
> > I think if I had it to do over, I'd run 5:1 servo motors on my
mill/ Rutex drives
> > and the rest the same.. GUT it all and sell the steppers on
ebay.. *I did throw
> > about six hundred pounds of old boss junk into a box and ship it
to a happy
> > ebayer who runs original hardware..
> >
> > David
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mike Mueller"
> > <mueller914@y...> wrote:
> >
> >>Bridgeport Series 1 w/Boss 3 controller:
> >>
> >>looking at the main electrical box, I wired up power going to
only 2 of the 3
> >
> > main fuses as follows:
> >
> >>(left to right)
> >>
> >>left= hot
> >>middle= hot
> >>right= no connection or power
> >>(yes, machine is grounded)
> >>
> >>The three transformers for the steppers read 53vdc, i can feel
that the
> >
> > stepper motors get energized. The controller does not work, which
is fine
> > since it's being removed as the Bridgeport will be operated via
my PC and
> > G201's.
> >
> >>
> >>Am I asking for trouble running it this way?
> >>VFD is going to run the spindle motor.
> >>
> >>Thanks,
> >>
> >>Mike
> >
> >
> >
> >
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