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Posted by Vernon on October 5, 2008, 2:09 pm
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>
>
> =A0 =A0 =A0 =A0 [ ... all snipped ... ]
>
> > Well, back on topic. =A0I got home with the lathe / mill today. =A0I'm
> > delighted to report that it was sitting on a little rubbermaid 5
> > drawer tool box that contained a treasure trove of goodies.
>
> =A0 =A0 =A0 =A0 This is for the lathe? =A0Can you post some photos of it =
-- to the
> dropbox <http://www.metalworking.com> if you don't have your own web
> page available. =A0I can't receive photos as attachments -- thanks to a
> size limit which keeps viruses out of some small mailing lists which I
> run.
>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0We
> > haven't inventoried everything yet but there's a lot of stuff. =A0The
> > lady who was assigned to escort me was the very same person who used
> > the lathe before the plant closure. =A0It was like she was giving up he=
r
> > baby to an orphanage. =A0Plant closures are so gut wrenching.
>
> =A0 =A0 =A0 =A0 Indeed so. =A0Were you able to convince her that it was g=
oing to a
> good home?
>
> > While I was gone the VFD came for the KBC mill. =A0So the family machin=
e
> > shop seems to be coming together quickly. =A0I'm reviewing the technica=
l
> > instructions on the inverter. =A0There is mention of some additional
> > components such as a "reactor" in case the input power is out of
> > balance by more than 3% plus a radio noise suppressor. =A0The latter
> > probably isn't needed.
>
> =A0 =A0 =A0 =A0 That depends. =A0If you have AM radios in the house, or T=
Vs still
> receiving over-the-air signals, the (RF) noise could be a problem.
>
> =A0 =A0 =A0 =A0 But the "3% balance" problem only applies when you are dr=
iving
> it from three phase. =A0Out-of-balance puts most of the current though tw=
o
> sets of diodes in the three phase bridge which could cause overheating
> at full output. =A0You are derating it somewhat to use from single phase,
> so no problem there.
>
> =A0 =A0 =A0 =A0 You are only connecting to the two 240 lines, not to the =
neutral
> (though you should have the safety ground connected).
>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 But I think the "reacto=
r" may apply to us.
> > Since we're in a rural location power is pretty dicey. =A0In fact,
> > recently, one leg of the 220v supply died completely. =A0I don't know
> > what that would do to an inverter. =A0But at $350 a pop I don't wanna
> > find out. =A0Even with my poor math one leg is a tad over 3% if I'm not
> > mistaken.
>
> =A0 =A0 =A0 =A0 It would be interpreted as "input voltage too low", and i=
t would
> just switch itself off.
>
> > I dug out my 1941 Machinist's Handbook this evening.
>
> =A0 =A0 =A0 =A0 My goodness -- that is as old as I am. I was "published" =
the
> same year. :-)
>
> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 I hope we can
> > find somebody to teach us the proper care and feeding of the lathe
> > before January. =A0That's when the next junior college manual lathe
> > operator's course meets.
>
> =A0 =A0 =A0 =A0 There is a set of training manuals for the machine in a y=
ellow
> three-ring binder labeled "Basis" IIRC. =A0It is oriented towards the
> early instruction set, but the later instructions are covered in an
> appendix.
>
> =A0 =A0 =A0 =A0 Best of luck,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 DoN.
>
> --
564
> =A0 =A0 =A0 =A0 (too) near Washington D.C. |http://www.d-and-d.com/dnicho=
ls/DoN.html
> =A0 =A0 =A0 =A0 =A0 =A0--- Black Holes are where God is dividing by zero =
---
Don,
Thanks for those very on-point clarifications. I hadn't thought about
posting pictures to the drop box. That's a great idea. We will try
to take some pictures tonight.
Regards,
Vernon
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> delighted to report that it was sitting on a little rubbermaid 5
> drawer tool box that contained a treasure trove of goodies.