# In need a motor starting capacitor

N

#### nowan

Jan 1, 1970
0
I need a motor starting capacitor for a 3/4hp 60Hz 115 Volt Bench Grinder.

Sometime ago I posted here in hopes of finding specifically what cap would
work. I got several responses, some provided general knowledge on
capacitors, some went into discussions whether it was run cap or start cap,
some suggested going to the manuf (Chinese generic). While I appreciate
those who responded, none gave me anything that I could use to purchase a
specific capacitor.

I'm not expecting anyone to guarantee that a specific cap will work, but
someone out here must have a bench grinder similar to mine that they've at
one time or another done an autopsy on that could tell me at least what cap
was in their particular machine.

Any help is appreicated. I'm tired of spinning my grinder before turning it
on!

K

#### Ken Layton

Jan 1, 1970
0
Have you looked for the motor manufacturer's model information?
Usually the motor maker will suggest a range of capacitors.

If not, It sounds like you need a start cap like 160 uf or so. Try
Jameco Electronics (www.jameco.com) # 332718CH ($2.95) N #### nowan Jan 1, 1970 0 Have you looked for the motor manufacturer's model information? Usually the motor maker will suggest a range of capacitors. If not, It sounds like you need a start cap like 160 uf or so. Try Jameco Electronics (www.jameco.com) # 332718CH ($2.95)

Thanks for the response. It's a Harbor Freight job - Central Machinery -
meaning off brand Chinese and to my knowledge they don't have any available
support. Plan is to order the one you suggest from Jameco.

J

#### James Sweet

Jan 1, 1970
0
nowan said:
I need a motor starting capacitor for a 3/4hp 60Hz 115 Volt Bench Grinder.

Sometime ago I posted here in hopes of finding specifically what cap would
work. I got several responses, some provided general knowledge on
capacitors, some went into discussions whether it was run cap or start cap,
some suggested going to the manuf (Chinese generic). While I appreciate
those who responded, none gave me anything that I could use to purchase a
specific capacitor.

I'm not expecting anyone to guarantee that a specific cap will work, but
someone out here must have a bench grinder similar to mine that they've at
one time or another done an autopsy on that could tell me at least what cap
was in their particular machine.

Any help is appreicated. I'm tired of spinning my grinder before turning it
on!

It's really not that critical, just google motor start capacitor and
find a place that sells them. Call them and tell them what you have,
they'll probably be able to tell you what will work. It sounds like
people have already given you the best advice they can, any start cap
for a 120V motor in that HP range should work fine.

J

#### JANA

Jan 1, 1970
0
Call around to any of the places that rebuild electric motors. You may have
to bring them the motor for them to test the inductance of its windings to
match a capacitor, unless you know the value of the cap. Some of these
motors use anything from about 2 to 20 uF depending on the requirement.
These are oil filled high current type capacitors.

--

JANA
_____

I need a motor starting capacitor for a 3/4hp 60Hz 115 Volt Bench Grinder.

Sometime ago I posted here in hopes of finding specifically what cap would
work. I got several responses, some provided general knowledge on
capacitors, some went into discussions whether it was run cap or start cap,
some suggested going to the manuf (Chinese generic). While I appreciate
those who responded, none gave me anything that I could use to purchase a
specific capacitor.

I'm not expecting anyone to guarantee that a specific cap will work, but
someone out here must have a bench grinder similar to mine that they've at
one time or another done an autopsy on that could tell me at least what cap
was in their particular machine.

Any help is appreicated. I'm tired of spinning my grinder before turning it
on!

J

#### James Sweet

Jan 1, 1970
0
JANA said:
Call around to any of the places that rebuild electric motors. You may have
to bring them the motor for them to test the inductance of its windings to
match a capacitor, unless you know the value of the cap. Some of these
motors use anything from about 2 to 20 uF depending on the requirement.
These are oil filled high current type capacitors.

Depends, if it's a PSC motor with a run cap then yes, if it's another
type with a start cap then the capacitor is non-polar electrolytic and
the value is not critical.

J

#### Jack

Jan 1, 1970
0
James said:
Depends, if it's a PSC motor with a run cap then yes, if it's another
type with a start cap then the capacitor is non-polar electrolytic and
the value is not critical.
Just fit a 15 UF cap with rating of 500 v. Stop having nightmares.
If it goes it goes. It switches out after starting anyway.