Jet Mini lathe overheat problem
 

Yesterday, I was turning in the garage, temp. about 90, and the lathe
suddenly slowed way down. My first thought was a brown-out, but
everything else ran to proper speed.

Motor case was very hot to the touch. This AM the lathe runs but
hand friction on the wheel can stop it with little effort.

So, did I cook the motor?

If I replace the motor, should I replace the capacitor as well?

HELP!

Joe

rookie turner -

Yesterday, I was turning in the garage, temp. about 90, and the lathe
suddenly slowed way down. My first thought was a brown-out, but
everything else ran to proper speed.

If I replace the motor, should I replace the capacitor as well?

Joe,

I think I'd replace just the capacitor. I don't believe it is a starting
capacitor, I believe it is actually a "Run" capacitor. Without it the
motor has very little power. And...replacing it is the least expensive
alternative. If that fails, then replace the motor.

I just got it second hand, the motor label says 1999. I'll call Monday
and ask about motors and capacitors and let you know if their back in
stock.

Joe

On 5 Aug 2005 10:01:16 -0700, "
wrote:

Yesterday, I was turning in the garage, temp. about 90, and the lathe
suddenly slowed way down. My first thought was a brown-out, but
everything else ran to proper speed.

Motor case was very hot to the touch. This AM the lathe runs but
hand friction on the wheel can stop it with little effort.

So, did I cook the motor?

If I replace the motor, should I replace the capacitor as well?

I had the selfsame experience (as did Mac Davis) with my Jet Mini,
back in February, I think it was. It was only two months old and the
motor fried. How old is yours?

Mine was a replacement for another (blue) Jet mini that I had turned
thousands of hours on. I'm thinking they must have gotten a bad run
of motors, because not only have I heard the identical story from a
number of people, but Jet doesn't currently have any replacement
motors and has since at least December, when I tried to get one to
replace the motor on my old mini.

--
Chuck *#:^)
chaz3913(AT)yahoo(DOT)com
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September 11, 2001 - Never Forget

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wrote:
Yesterday, I was turning in the garage, temp. about 90, and the lathe
suddenly slowed way down. My first thought was a brown-out, but
everything else ran to proper speed.

Motor case was very hot to the touch. This AM the lathe runs but
hand friction on the wheel can stop it with little effort.

So, did I cook the motor?

If I replace the motor, should I replace the capacitor as well?

HELP!

Joe

rookie turner -

Consider what the caps do - when functional they phase shift the voltage from the
current and in that process the Impedance (AC resistance of the circuit) drops.
If the cap, the run cap as suggested - I concur, gets to hot and expands - then shorts -
the short cap then allows current, but with the motor winding by itself the impedance
or ac resistance of the winding is to high to allow enough current to flow that
allows fast turning. Slow turning shuts off cooling and can burn a winding if let
go. I'd replace both Start and Run caps - then you will have the right one for
sure - but if they are of the same manufacturer maybe the same issue will occur
or has as well. Maybe leaking means slower starting but not noticed.

Martin

--
Martin Eastburn
@ home at Lion's Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder

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In article .com,
" wrote:

I just got it second hand, the motor label says 1999. I'll call Monday
and ask about motors and capacitors and let you know if their back in
stock.

You likely know this...

You don't have to go to Jet to get the capacitor replaced or motor
serviced. Any electric motor shop can get the parts or test and service
the motor for you - more than likely at much less cost than ordering
from Jet along with the shipping & handling.

Just food for thought.

--
Owen Lowe

Northwest Woodturners,
Cascade Woodturners,
Pacific Northwest Woodturning Guild
___
Safety Tip'o'th'week: Never grind aluminum and steel or iron on the same
machine or workstation - Thermite.
http://www.hanford.gov/lessons/sitell/ll01/2001-36.htm

On 5 Aug 2005 14:07:31 -0700, "
wrote:

I just got it second hand, the motor label says 1999. I'll call Monday
and ask about motors and capacitors and let you know if their back in
stock.

Joe

IMO, it's not worth replacing the motor if it isn't on warranty...
I just can't see paying $135 for the motor of a $200 lathe... better to just buy
a new one and make something else out of the old one... YMMV


mac

Please remove splinters before emailing

On Sat, 06 Aug 2005 09:33:55 -0700, mac davis
wrote:


better to just buy
a new one and make something else out of the old one... YMMV

"Boat anchor" leaps to mind...


--
Chuck *#:^)
chaz3913(AT)yahoo(DOT)com
Anti-spam sig: please remove "NO SPAM" from e-mail address to reply.


September 11, 2001 - Never Forget

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On Sat, 06 Aug 2005 21:10:24 GMT, (Chuck) wrote:

On Sat, 06 Aug 2005 09:33:55 -0700, mac davis
wrote:


better to just buy
a new one and make something else out of the old one... YMMV

"Boat anchor" leaps to mind...

hey, you can always put that old washing machine or whatever motor that's laying
around on it and make it a buffing system or sharpening station... maybe even a
lathe! *g*


mac

Please remove splinters before emailing

Took the motor to an electric shop this AM. Tested to be drawing 20
amps.
Diagnosis = DOA

They referred me back to Jet as "chinese motors are hard to get and
vary greatly".

Jet now has the motors back in stock...as I already have 3
anchors...I'll repower the lathe.

Does anyone make lathes with non-Chinese motors?