I am considering using a static phase converter to run a 3ph 1.5HP
bench grinder and 1/2HP dust collector.

Phase a matic makes a standard and a heavy duty phase converter.
Is the standard a more robust version or are there some significant
differences. Maybe the standard just has start caps and the Heavy
duty also has run caps? There is about a 30 dollar price difference.
thanks
chuck

The "heavy duty" version doesn't have run caps and won't give you any more
power. It is designed to allow more restarts without going belly up,
especially if your motor has high starting load.
So once the motor is started, both the light duty and heavy duty versions
will give you about 2/3's of the power you would have with real 3 phase and
in your case you shouldn't need the heavy duty version.

Actually I have a used 3HP phase a matic static converter that was working
great when I pulled it out to go the VFD route. If you're interested in
purchasing it for a good price send an email to
ptAT_NO_SPAM_PLEASEpower-tDOTcom, removing everything in CAPS and replacing
it with the correct at and dot characters.

Paul T.


"Charles A. Sherwood" wrote in message
...
I am considering using a static phase converter to run a 3ph 1.5HP
bench grinder and 1/2HP dust collector.

Phase a matic makes a standard and a heavy duty phase converter.
Is the standard a more robust version or are there some significant
differences. Maybe the standard just has start caps and the Heavy
duty also has run caps? There is about a 30 dollar price difference.
thanks
chuck

In article ,
Charles A. Sherwood wrote:
I am considering using a static phase converter to run a 3ph 1.5HP
bench grinder and 1/2HP dust collector.

Phase a matic makes a standard and a heavy duty phase converter.
Is the standard a more robust version or are there some significant
differences. Maybe the standard just has start caps and the Heavy
duty also has run caps? There is about a 30 dollar price difference.

You've already gotten information posted on the difference
between the standard and the heavy duty.

My question is whether the dust collector will ever have to be
started while the grinder is not running. The reason is that there is
a limited range of horsepowers that these "static" converters will
handle. But -- the 1.5 HP grinder, when running, can act as a rotary
converter and this will start the dust collector with no problems.

However, also note that you will lose about 33% of the load
capability with these phase converters, compared to running on true
three phase -- including that made from single phase with a rotary
converter or a VFD (Variable Frequency Drive -- an electronic device
which synthesizes the three phase from rectified input voltage which can
be single phase.

The VFD's strong point is that it allows you to tune the speed
of the motor, if that will help you on the grinder. It does on a lathe
or a milling machine, but I'm not sure about a grinder.

The rotary converter can be built from a *used* (and therefore
cheap) three-phase motor of somewhat higher horsepower (say 2-3 HP for
this) and some means of starting (which could be the static phase
converter, or some thing which you build. You ideally should then
tune the rotary converter with capacitors to get the best balance of
voltage and current. This won't matter for something like a bench
grinder, but a well-balanced three phase yields a better surface finish
with a surface grinder.

Good Luck,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

On Fri, 30 Jul 2004 22:44:53 +0200, "Jacko"
wrote:

Does anyone know if someone makes an adaptor so that one can use ER collets
on a Lorch 10mm clockmaker's lathe?

Many Thanks

Jacko

No..but Ill sell you a very nice LLK Lorch.

Gunner

"At the core of liberalism is the spoiled child -
miserable, as all spoiled children are, unsatisfied,
demanding, ill-disciplined, despotic and useless.
Liberalism is a philosphy of sniveling brats." -- P.J. O'Rourke

In article ,
Gunner wrote:
On Fri, 30 Jul 2004 22:44:53 +0200, "Jacko"
wrote:

Does anyone know if someone makes an adaptor so that one can use ER collets
on a Lorch 10mm clockmaker's lathe?

Many Thanks

Jacko

No..but Ill sell you a very nice LLK Lorch.

And if you're wondering what that non-sequitur was about, you
posted as a follow-up to an earllier thread, changing only the "Subject: "
line, not also editing out the "References: " header which would have
divorced it from the original thread, and prevented it from being a
similar non-sequitur.

Your newsreader should have an option for starting an original
article, which is different from a "Followup", and which would not leave
the links in place in the "References: " header.

As an example, here is a thread map as produced by my newsreader
(it will probably appear distorted if you view it in a variable-pitch font,
but a fixed-pitch one, such as Courier (the most common fixed-pitch one)
will show it as it should be:

================================================== ====================
[1] static phase converter question
[2] ER to Lorch?

(1)+-(1)
|-(2)--(2)
\-(1)
================================================== ====================

The numbers represent different subject lines, and the upper occurrences
of them show which actual subject line goes with each number. Your
request came in in the middle of the thread as the first "(2)",
appearing as a response to a thread discussing a totally different
topic. If your newsreader does not handle threads, you probably did not
see this, but it happened, and is disconcerting to those of us to *do*
use newsreaders which handle threading properly.

As for your original question, I would have to say that I would
consider most sizes of ER collets to be too large for a 10mm lathe.
(Certainly the 25mm ones which my Compact-5 uses would be too large).

Normally, the 10mm lathes use size "D" collets with a drawbar,
and the spindle is already designed to handle them. (Though I have never
handled a Lorch, so I don't know for sure that this is the case here.)
I *have* used a Derbyshire lathe in the past.

Good Luck,
DoN.
--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---