The 3hp motor on my 1023 Grizzly saw has crapped out. Starting switch and
capacitor are ok, but the motor draws excessive current and snarls when it
reaches running speed, and the overload on the motor switch kicks out.
Sounds like a shorted winding somewhere, or a bad winding in any case, since
all an induction motor has is a starting switch, a capacitor, and
wire--gotta be the wire.
Is there any chance that getting the motor fixed (at least partially
rewound) could be cheaper than a new motor (which goes for $250)? My
impression is that these days rewinding is just for like 20 hp motors.
Anybody got any experience along these lines?
I'd see if Griz will make a deal.
WL
"donald girod" <[email protected]> wrote in message
news:[email protected]...
> The 3hp motor on my 1023 Grizzly saw has crapped out. Starting switch and
> capacitor are ok, but the motor draws excessive current and snarls when it
> reaches running speed, and the overload on the motor switch kicks out.
> Sounds like a shorted winding somewhere, or a bad winding in any case,
since
> all an induction motor has is a starting switch, a capacitor, and
> wire--gotta be the wire.
>
> Is there any chance that getting the motor fixed (at least partially
> rewound) could be cheaper than a new motor (which goes for $250)? My
> impression is that these days rewinding is just for like 20 hp motors.
> Anybody got any experience along these lines?
>
On Sun, 26 Oct 2003 06:40:12 -0600, "Rich" <[email protected]>
brought forth from the murky depths:
>Check the motor first. Does it turn easy by hand? Ohm the start winding and
>run winding and check for a ground.Usually a single phase motor that has a
>bad start winding will not start and if the run winding is bad it will not
>try to accelerate to full speed. Rewinding will cost you more than a new
>motor. let me know if you need info on what wires to check.
The last time I checked motor rewinding costs was about 5 years
ago. A place in Escondido, CA wanted $104 for a NEMA 56 1.5 (or
2hp?) motor. I don't imagine that the jump to 3hp would make a
great difference, but time might.
If I were Donald, I'd check local rewinding prices. There are few
people who still do it and some of those are retired (lowering the
cost if they do it to keep busy.)
--------------------------------------------------
I survived the D.C. Blizzard of 2003 (from Oregon)
----------------------------
http://diversify.com Comprehensive Website Development
--------------------------------------------------------
On Sun, 26 Oct 2003 13:43:52 GMT, "Michael R. Dow"
<[email protected]> brought forth from the murky depths:
>This might also be a good time to upgrade to a 5hp motor....
$69.99 gets him one at Harbor Freight right now. If nothing
else, it could get him up and running until he had the other
one rewound.
--------------------------------------------------
I survived the D.C. Blizzard of 2003 (from Oregon)
----------------------------
http://diversify.com Comprehensive Website Development
--------------------------------------------------------
"donald girod" <[email protected]> wrote in message
news:[email protected]...
> The 3hp motor on my 1023 Grizzly saw has crapped out. Starting switch and
> capacitor are ok, but the motor draws excessive current and snarls when it
> reaches running speed, and the overload on the motor switch kicks out.
>
> Is there any chance that getting the motor fixed (at least partially
> rewound) could be cheaper than a new motor (which goes for $250)? My
> impression is that these days rewinding is just for like 20 hp motors.
> Anybody got any experience along these lines?
>
Why not see what a motor shop has to say? It could be overloading from
bearing on the way out also. Worst case scenario is they put in on the bench
and charge a few bucks to diagnose, best case is they fix it for just a few
buck also.
Ed
I did all that--the bearings are perfect, the starting winding is perfect,
the starting switch is perfect. The resistance is the same with the
starting winding in or out--.8 ohms. There is no terminal block (this is
single-voltage, non-reversable motor), so I can't check the windings
independently without taking the motor apart, but I can check with the
starting switch oper/closed. It starts right up, comes up to speed slowly
(as you suggest), growls when running "at speed" but I don't think it ever
reaches 3450, and blows the overload breaker in the motor switch after about
3 or 4 seconds--I would guess from the dimming lights that it is pulling a
good 30 amps.
You are confirming my suspicion that you can't rewind a motor for $250, not
if the outfit gets $50/hour and you have to pay for the copper wire.
Thanks for the reply.
"Rich" <[email protected]> wrote in message
news:[email protected]...
> Check the motor first. Does it turn easy by hand? Ohm the start winding
and
> run winding and check for a ground.Usually a single phase motor that has a
> bad start winding will not start and if the run winding is bad it will not
> try to accelerate to full speed. Rewinding will cost you more than a new
> motor. let me know if you need info on what wires to check.
> "donald girod" <[email protected]> wrote in message
> news:[email protected]...
> > The 3hp motor on my 1023 Grizzly saw has crapped out. Starting switch
and
> > capacitor are ok, but the motor draws excessive current and snarls when
it
> > reaches running speed, and the overload on the motor switch kicks out.
> > Sounds like a shorted winding somewhere, or a bad winding in any case,
> since
> > all an induction motor has is a starting switch, a capacitor, and
> > wire--gotta be the wire.
> >
> > Is there any chance that getting the motor fixed (at least partially
> > rewound) could be cheaper than a new motor (which goes for $250)? My
> > impression is that these days rewinding is just for like 20 hp motors.
> > Anybody got any experience along these lines?
> >
>
>
Yes, I am certain. It pops open with a nice arc and a sput. AND, I checked
the resistance between the windings and the motor frame (= saw frame, etc.,
lots of stuff to grab onto). .5 ohms!! The only thing saving me from CPR
was the green wire and the bare wire all the way back to the panel. It had
to be dumping about 20A into the circuit ground, and this is likely what
blew the overload (after 5 seconds or so, plenty of time to die).
It is scary to think that an induction motor can just short the hot wire to
ground on a whim. Every time you use equipment with this type of motor (any
stationary tool, just about), you are depending on that ground. I don't
know, maybe some equipment like this is double insulated but nothing that I
have is. And if you put a GFCI on the circuit it is going to pop all the
time. They often blow with electric motor loads, or so I have read. My
only experience is our washing machine, which pops the GFCI about once a
month.
I am getting a new motor. And 3hp is plenty for anything I do, as is $250.
"Roger Jensen" <[email protected]> wrote in message
news:[email protected]...
> Are you certain about the start switch? It sounds like it is hanging up
and
> not switching to the run windings.
>
> Rog
>
>
>
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"Larry Jaques" <jake@di\/ersify.com> wrote in message
news:[email protected]...
> On Sun, 26 Oct 2003 13:43:52 GMT, "Michael R. Dow"
> <[email protected]> brought forth from the murky depths:
>
> >This might also be a good time to upgrade to a 5hp motor....
>
> $69.99 gets him one at Harbor Freight right now. If nothing
> else, it could get him up and running until he had the other
> one rewound.
>
>
>
Nope, ain't gonna work!
I am pretty sure that Grizzly's cabinet saw motor is much like Delta's with
the mounts welded on.
If I am wrong, well never mind!
Greg
Check the motor first. Does it turn easy by hand? Ohm the start winding and
run winding and check for a ground.Usually a single phase motor that has a
bad start winding will not start and if the run winding is bad it will not
try to accelerate to full speed. Rewinding will cost you more than a new
motor. let me know if you need info on what wires to check.
"donald girod" <[email protected]> wrote in message
news:[email protected]...
> The 3hp motor on my 1023 Grizzly saw has crapped out. Starting switch and
> capacitor are ok, but the motor draws excessive current and snarls when it
> reaches running speed, and the overload on the motor switch kicks out.
> Sounds like a shorted winding somewhere, or a bad winding in any case,
since
> all an induction motor has is a starting switch, a capacitor, and
> wire--gotta be the wire.
>
> Is there any chance that getting the motor fixed (at least partially
> rewound) could be cheaper than a new motor (which goes for $250)? My
> impression is that these days rewinding is just for like 20 hp motors.
> Anybody got any experience along these lines?
>