Connect with us

In need a motor starting capacitor

Discussion in 'Electronic Repair' started by nowan, Mar 18, 2007.

Scroll to continue with content
  1. nowan

    nowan Guest

    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 sent me links to where to buy (although I didn't know WHAT to buy),
    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!
     
  2. Ken Layton

    Ken Layton Guest

    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)
     
  3. nowan

    nowan Guest

    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.

    Appreciate the answer!
     
  4. James Sweet

    James Sweet Guest


    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.
     
  5. JANA

    JANA Guest

    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 sent me links to where to buy (although I didn't know WHAT to buy),
    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!
     
  6. James Sweet

    James Sweet Guest


    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.
     
  7. Jack

    Jack Guest

    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.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-