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Default Jet 1442 Problem

I have the above woodturning lathe and it's been acting strangely all of a
sudden. The complete sequence of events.

- Lathe runs fine in the garage/shop, although not much time put on it.
(bought it new)
- All of a sudden, every time I try to turn it on, it trips the GFI it's
plugged into
- I use an extension cord to plug it into a non-gfi, and it works fine, for
a (very) little while
- Now, when i turn it on, (it's a capacitor start/capacitor run motor), it
doesn't kick over from the start capacitor to the run capacitor which is
usually accompanied by a definite "click" and a smoother run after it kicks
over.

questions:

Is this what happens when a capacitor (the start) goes bad? Or is there
something in the kickover that can/has gone bad?
The motor has very little run time, this seems very odd to have happened
already.
would the bad/going bad capacitor cause the gfi to trip every time?

Any help would be appreciated.

Joe


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Default Jet 1442 Problem

return it for a new motor.

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Default Jet 1442 Problem


"Joe" wrote in message
...
I have the above woodturning lathe and it's been acting strangely all of a
sudden. The complete sequence of events.

- Lathe runs fine in the garage/shop, although not much time put on it.
(bought it new)
- All of a sudden, every time I try to turn it on, it trips the GFI it's
plugged into
- I use an extension cord to plug it into a non-gfi, and it works fine,
for a (very) little while
- Now, when i turn it on, (it's a capacitor start/capacitor run motor), it
doesn't kick over from the start capacitor to the run capacitor which is
usually accompanied by a definite "click" and a smoother run after it
kicks over.

questions:

Is this what happens when a capacitor (the start) goes bad? Or is there
something in the kickover that can/has gone bad?
The motor has very little run time, this seems very odd to have happened
already.
would the bad/going bad capacitor cause the gfi to trip every time?

Any help would be appreciated.


The click is a centrifugal switch, normally. If the motor does not come up
to speed the switch won't trip. If the contacts (points) are fused, it
won't trip either. This can be remedied by cleaning the points with some
400 sandpaper. WITH THE THING UNPLUGGED AND A MINUTE OR TWO FOR COMPLETE
CAPACITOR BLEED.

Not sure if this is your problem, however. Have you given it a good blast
or two of air? The GFI trips if there's a short. Could be you've got some
gunk in there. I'd try that first. Not the kind of thing you want to do,
bypass a GFI. It's a safety device, after all.

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Default Jet 1442 Problem


Any help would be appreciated.


The click is a centrifugal switch, normally. If the motor does not come
up to speed the switch won't trip. If the contacts (points) are fused, it
won't trip either. This can be remedied by cleaning the points with some
400 sandpaper. WITH THE THING UNPLUGGED AND A MINUTE OR TWO FOR COMPLETE
CAPACITOR BLEED.

Not sure if this is your problem, however. Have you given it a good blast
or two of air? The GFI trips if there's a short. Could be you've got
some gunk in there. I'd try that first. Not the kind of thing you want
to do, bypass a GFI. It's a safety device, after all.


I blasted the motor with air, I'm now going to pull the covers off of the
capacitors and blast that as well. hopefully that will cure the problem.
I'll also try to find the points you're talking about, although with the
small amount of run time, i *hope* that's not the problem.

Wasn't trying to bypass the gfi receptacle. just trying non gfi outlets to
try to pinpoint the source of the problem. At the time, I didn't know
whether the gfi had gone bad or not.

Thanks,

Joe


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Default Jet 1442 Problem

The GFI will rip easily. The extension cord could also make it trip if not a
large guage... at least 12 and no longer than 25feet.

"Joe" wrote in message
...
I have the above woodturning lathe and it's been acting strangely all of a
sudden. The complete sequence of events.

- Lathe runs fine in the garage/shop, although not much time put on it.
(bought it new)
- All of a sudden, every time I try to turn it on, it trips the GFI it's
plugged into
- I use an extension cord to plug it into a non-gfi, and it works fine,
for a (very) little while
- Now, when i turn it on, (it's a capacitor start/capacitor run motor), it
doesn't kick over from the start capacitor to the run capacitor which is
usually accompanied by a definite "click" and a smoother run after it
kicks over.

questions:

Is this what happens when a capacitor (the start) goes bad? Or is there
something in the kickover that can/has gone bad?
The motor has very little run time, this seems very odd to have happened
already.
would the bad/going bad capacitor cause the gfi to trip every time?

Any help would be appreciated.

Joe






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Default Jet 1442 Problem

I agree, but it trips with and w/o extension cord. And the cord I used was
a 9' air conditioner ext cord, more than adequate. Also, there is the issue
that this started happening after everything working fine for a number of
months.

joe

"tdup2" wrote in message
...
The GFI will rip easily. The extension cord could also make it trip if not
a large guage... at least 12 and no longer than 25feet.



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Default Jet 1442 Problem

Most likely -- your centrifugal switch is not opening. That switch is
IN the motor so it must be taken apart to get to it. Sometimes air
through the motor will do the trick but only sometimes.

If the start capacitor is bad (not very likely) it may not get the motor
spun up enough to kick the cent... switch. In this case you may be able
to spin it up by hand fast enough to kick it. That would prove that the
switch probably working right but the capacitor is bad.

If under warranty -- take it back.

Three phase motors don't have any of that 'stuff' which goes bad in
single phase motors. With the advent of less expensive vfds, somebody
needs to come out with a motor/vfd retrofit kit for various lathes for
those folks who are tired of screwing with capacitors and centrifugal
switches. That would also give you the low rpm and reversing which are
so sorely needed on so many Reeves drive equipped lathes.

Bill

Joe wrote:
I agree, but it trips with and w/o extension cord. And the cord I used was
a 9' air conditioner ext cord, more than adequate. Also, there is the issue
that this started happening after everything working fine for a number of
months.

joe

"tdup2" wrote in message
...
The GFI will rip easily. The extension cord could also make it trip if not
a large guage... at least 12 and no longer than 25feet.



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Default Jet 1442 Problem

Bill,

Thanks for the reply. Since it's a tefc, I was hoping to avoid what you're
suggesting doing, which is take it apart, but oh well. Guess that's a
project for tomorrow. Just how long do those capacitors hold a charge
anyway? Not looking forward to getting zapped.

jc

"Bill Rubenstein" wrote in message
. ..
Most likely -- your centrifugal switch is not opening. That switch is IN
the motor so it must be taken apart to get to it. Sometimes air through
the motor will do the trick but only sometimes.

If the start capacitor is bad (not very likely) it may not get the motor
spun up enough to kick the cent... switch. In this case you may be able
to spin it up by hand fast enough to kick it. That would prove that the
switch probably working right but the capacitor is bad.

If under warranty -- take it back.

Three phase motors don't have any of that 'stuff' which goes bad in single
phase motors. With the advent of less expensive vfds, somebody needs to
come out with a motor/vfd retrofit kit for various lathes for those folks
who are tired of screwing with capacitors and centrifugal switches. That
would also give you the low rpm and reversing which are so sorely needed
on so many Reeves drive equipped lathes.

Bill



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Default Jet 1442 Problem


"Joe" wrote in message
et...
Bill,

Thanks for the reply. Since it's a tefc, I was hoping to avoid what
you're suggesting doing, which is take it apart, but oh well. Guess
that's a project for tomorrow. Just how long do those capacitors hold a
charge anyway? Not looking forward to getting zapped.

^^^^^^^^^^^^^^^^^^^
The capacitor on a single phase motor is there to produce phase shifting, to
create a "fake" rotating field. Since it is on AC, I don't see how it would
wind up with a charge when the motor is off. However, in case I am wrong,
just use a grounded clip lead to short out any terminal before you touch it.


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Default Jet 1442 Problem

if you think about it, the capacitor is across some windings to produce a
phase shift. Also, electrolytics have a pretty good leakage. Of course an
AC circuit can leave volts on a capacitor, it just depends where in the AC
cycle you turn it off - but I wouldn't worry - unplug and take it apart, by
the time you get it apart, the cap will be discharged. But, the cap is an
electrical part, it doesn't care about dust - you can pack it in dust and
nothing will happen unless the dust has a lot of water and shorts it out-
more likely welded contacts or dust keeping them from opening, or a broken
wire inside the motor.


"Joe" wrote in message
et...
Bill,

Thanks for the reply. Since it's a tefc, I was hoping to avoid what
you're suggesting doing, which is take it apart, but oh well. Guess
that's a project for tomorrow. Just how long do those capacitors hold a
charge anyway? Not looking forward to getting zapped.

jc

"Bill Rubenstein" wrote in message
. ..
Most likely -- your centrifugal switch is not opening. That switch is IN
the motor so it must be taken apart to get to it. Sometimes air through
the motor will do the trick but only sometimes.

If the start capacitor is bad (not very likely) it may not get the motor
spun up enough to kick the cent... switch. In this case you may be able
to spin it up by hand fast enough to kick it. That would prove that the
switch probably working right but the capacitor is bad.

If under warranty -- take it back.

Three phase motors don't have any of that 'stuff' which goes bad in
single phase motors. With the advent of less expensive vfds, somebody
needs to come out with a motor/vfd retrofit kit for various lathes for
those folks who are tired of screwing with capacitors and centrifugal
switches. That would also give you the low rpm and reversing which are
so sorely needed on so many Reeves drive equipped lathes.

Bill






--
Posted via a free Usenet account from http://www.teranews.com



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"Joe" wrote in message
...
I have the above woodturning lathe and it's been acting strangely all of a
sudden. The complete sequence of events.

- Lathe runs fine in the garage/shop, although not much time put on it.
(bought it new)
- All of a sudden, every time I try to turn it on, it trips the GFI it's
plugged into
- I use an extension cord to plug it into a non-gfi, and it works fine,
for a (very) little while
- Now, when i turn it on, (it's a capacitor start/capacitor run motor), it
doesn't kick over from the start capacitor to the run capacitor which is
usually accompanied by a definite "click" and a smoother run after it
kicks over.

questions:

Is this what happens when a capacitor (the start) goes bad? Or is there
something in the kickover that can/has gone bad?
The motor has very little run time, this seems very odd to have happened
already.
would the bad/going bad capacitor cause the gfi to trip every time?

Any help would be appreciated.

Joe


Capacitor start motors are notorious for tripping GFI receptacles. GFI
receptacles are typically designated for use with portable hand held tools,
which a lathe is not. It sounds like your motor incorporates a centrifigal
switch which is not opening because it is worn out or fused together, or
full of crud.




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Default Jet 1442 Problem



Capacitor start motors are notorious for tripping GFI receptacles. GFI
receptacles are typically designated for use with portable hand held
tools, which a lathe is not.



Do you think I would be better off removing the GFI receptacle and
installing a GFI breaker instead?
The garage is on one breaker, and the gfi is upstream of the rest of the
receptacles. Are the GFI breakers less finiky than the receptacles?
I should probably just put in a sub panel, but I don't think I have the
room.

thanks,

Joe


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I'd solve the problems one at a time. Why does the motor not work? As
I remember, it doesn't work on a non-GFI circuit either?

Bill

Joe wrote:
Capacitor start motors are notorious for tripping GFI receptacles. GFI
receptacles are typically designated for use with portable hand held
tools, which a lathe is not.



Do you think I would be better off removing the GFI receptacle and
installing a GFI breaker instead?
The garage is on one breaker, and the gfi is upstream of the rest of the
receptacles. Are the GFI breakers less finiky than the receptacles?
I should probably just put in a sub panel, but I don't think I have the
room.

thanks,

Joe


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"Bill Rubenstein" wrote in message
t...
I'd solve the problems one at a time. Why does the motor not work? As I
remember, it doesn't work on a non-GFI circuit either?

Bill


Quite right.

jc


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Default Jet 1442 Problem

Hi Joe, Not sure where this thread is going. All the responses give
good reasons for your troubles and woes and are a helpful academic
review of cap start-cap run single phase ac motor troubles, but if it's
still in warranty IMHO, the most practicable advice for a _woodturner
was to get a new motor or if not, consider taking it to a repair shop.


Turn to Safety, Arch
Fortiter


http://community.webtv.net/almcc/MacsMusings





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Default Jet 1442 Problem - FOLLOW UP

Everyone,

Thank you for your responses. I've learned a lot and taken a lot of advice.

I opened up part of the motor today. Here's what I found:

Inside is immaculate, which I would have expected for a TEFC (hence the TE)
I now have an understanding of how the centrifigal switch operates, it was
operating smoothly, no fusing, no dust, no problem.
HOWEVER,
you almost have to see this to believe it. I posted two pics in
alt.binaries.pictures.woodworking.

A piece which should have been installed on the shaft was rumbling loose in
there. There's no way it ever made it on the shaft during manufacturing.

The only amazing part is that this thing ever ran while plugged into a gfi.
I guess eventually this piece contacted the housing and caused the short.

I'm going to put it back together and see if it runs without this piece and,
of course, I'll be following up with JET. Even if the warranty period is
out, this is a definate manufacturing defect.

I'll keep everyone posted with what Jet does.

Thanks again,

Joe C.


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Let's assume that it runs correctly when you reassemble it. What do
you want Jet to do?

Joe wrote:
....
I'm going to put it back together and see if it runs without this piece and,
of course, I'll be following up with JET. Even if the warranty period is
out, this is a definate manufacturing defect.

I'll keep everyone posted with what Jet does.

Thanks again,

Joe C.


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Joe wrote:
...
I'm going to put it back together and see if it runs without this piece
and, of course, I'll be following up with JET. Even if the warranty
period is out, this is a definate manufacturing defect.


"Mike Berger" wrote in message
...
Let's assume that it runs correctly when you reassemble it. What do
you want Jet to do?



If it runs correctly, nothing. Why would I want them to do anything?

I called them to learn more about this extraneous piece and how critical it
is. They were very helpful by the way and said to call them if the motor
doesn't run after I put it back together and they would try to help me out
even though the motor (and the entire lathe, for that matter) is out of
warranty.

It was certainly worth the call.

Joe C.


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"Mike Berger" wrote in message
...
Let's assume that it runs correctly when you reassemble it. What do
you want Jet to do?


How about something along the lines of supplying a motor that doesn't have
this flaw? After all, it has caused the lathe to be inoperable and now we
have a part missing from the motor that we don't understand the function of,
which may or may not be of critical importance to the safe, reliable
functioning of the motor. Also, damage to the motor may have occurred as a
result of this part flopping around loose, which may have severely shortened
the usable life of the motor, especially the windings.


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"Joe" wrote in message
. net...
If it runs correctly, nothing. Why would I want them to do anything?


Because you'd always be waiting for the other shoe to drop. The piece came
from somewhere, perhaps somewhere structural. Failure could come without
notice. Accidental success is the bane of every repairman's existence.

I'm in a similar circumstance myself, having assembled my new drillpress
with two long bolts left over. Though identified in the materials list,
there were no instructions as to where to put them. It seems to run right,
but why would anyone cost-conscious include extra hardware? Waiting for an
answer from them.




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"Joe" wrote in message
et...


Capacitor start motors are notorious for tripping GFI receptacles. GFI
receptacles are typically designated for use with portable hand held
tools, which a lathe is not.



Do you think I would be better off removing the GFI receptacle and
installing a GFI breaker instead?
The garage is on one breaker, and the gfi is upstream of the rest of the
receptacles. Are the GFI breakers less finiky than the receptacles?
I should probably just put in a sub panel, but I don't think I have the
room.

thanks,

Joe



FWIW Joe, all of my wall outlets in my garage are on ground fault outlets
and I've never tripped one with my tablesaw, my drill press, or my jointer.
I would not worry too much about the GFI's.

-Mike-


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"Long Ranger" wrote in message
ink.net...
Capacitor start motors are notorious for tripping GFI receptacles.
GFI receptacles are typically designated for use with portable hand held
tools, which a lathe is not.


On what do you base those statements? Where have you seen restrictions on
the type of loads that can be run from a GFCI?

It sounds like your motor incorporates a centrifigal switch which is not
opening because it is worn out or fused together, or full of crud.


That could trip a circuit breaker due to over current, but it won't trip a
GFCI circuit, as it is not a "ground fault".

Ben Miller
--
Benjamin D. Miller, PE
B. MILLER ENGINEERING
www.bmillerengineering.com


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"Ben Miller" wrote in message
...
"Long Ranger" wrote in message
ink.net...
Capacitor start motors are notorious for tripping GFI receptacles.
GFI receptacles are typically designated for use with portable hand held
tools, which a lathe is not.


On what do you base those statements? Where have you seen restrictions on
the type of loads that can be run from a GFCI?

*Single phase motors, (and particularly cheap single phase motors), and cap
start motors are notorious for tripping GFI outlets because they tend to
generate eddy currents in their windings and induce imbalances on the
conductors feeding them. They also reflect current and voltage spikes back
on the feed when they switch off of the start windings. In the early days of
GFI outlets, hair dryers were a big culprit. I don't know if the receptacles
are less sensitive now, or if hair dryers have better motors, but it seems
to have lessened greatly. I don't mean to say that lathes are restricted
from the GFI circuitry. I mean to say that the purpose of GFI protection at
the level of the outlet is targeted towards hand-held tools. That is why you
don't see a GFI on a washing machine. It is a stationary piece of equipment,
and the plug serves as it's disconnect for servicing. Same with a lathe,
unless it is a little tiny bench-top model. Even then, it is a grey area.

It sounds like your motor incorporates a centrifigal switch which is not
opening because it is worn out or fused together, or full of crud.


That could trip a circuit breaker due to over current, but it won't trip a
GFCI circuit, as it is not a "ground fault".

*That was not a reference to the GFI problem. It was a reference to a
seperately described situation. Go back and read the original text. (By the
way, any type of imbalance of sufficient magnitude will trip a GFI, not just
a "ground fault".)
Ben Miller
--
Benjamin D. Miller, PE
B. MILLER ENGINEERING
www.bmillerengineering.com



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Long Ranger wrote:

I mean to say that the purpose of GFI protection at
the level of the outlet is targeted towards hand-held tools. That is why you
don't see a GFI on a washing machine. It is a stationary piece of equipment,
and the plug serves as it's disconnect for servicing.


I believe receptacles, including washer, within 6' of a sink require a
GFCI. Also in unfinished basement areas.

--
bud--
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