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Thread: Wiring 3 position switch to run motor forward/reverse without rewiring

  1. #1
    Join Date
    May 2012
    Location
    Grande Prairie Alberta
    Posts
    32

    Wiring 3 position switch to run motor forward/reverse without rewiring

    Hi all,

    I am just waiting on delivery of my NWG parts and I am starting to plan out my build.



    I have a Baldor 1.5hp single phase motor and I am planning out the wiring.

    I got thinking it would be nice to be able to run the grinder for edge up grinding so belt running towards the floor. Then running belt up towards the ceiling for polish and convex edge with cork/scotchbrite belts so also edge up.

    My motor can be wired for either direction.

    My question is can I wire in some kind of 3 position switch that can run forward, reverse, and off?

    Can this be done?

    Thanks.

  2. #2
    Join Date
    Aug 2009
    Location
    Central Point Oregon
    Posts
    1,527
    Google drum switch- images

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  3. #3
    Join Date
    Feb 2010
    Location
    Woodland Park, CO.
    Posts
    191
    Drum switches are what to use, I bought one for my homemade disk grinder and it works great. It was a little complicated for me to wire and ended up taking it to a electric motor shop to get it wired. I think there was a tread here about wiring a drum switch? I am sure somebody here can direct you! Funny story, I had a house electrician try and wire this switch when I first got it and he gave up after he almost smoked my motor, he tried to be a welder. Ha Ha
    Good luck,
    Clint

  4. #4
    Join Date
    Sep 2009
    Location
    Great Falls, Montana, USA
    Posts
    1,622
    Just a caution..... think about what you're doing before wiring a grinder for reverse......it creates a lot of safety issues, and a lot of stuff will get thrown up into your face. But, if you still want to do it, a drum switch is what's called for on a single speed machine. If you're using a VFD, you can get an optional Foward/stop/reverse switch.

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    "Nobody cares what you know.....until they know you care."
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  5. #5
    Join Date
    May 2012
    Location
    Grande Prairie Alberta
    Posts
    32
    Quote Originally Posted by EdCaffreyMS View Post
    Just a caution..... think about what you're doing before wiring a grinder for reverse......it creates a lot of safety issues, and a lot of stuff will get thrown up into your face. But, if you still want to do it, a drum switch is what's called for on a single speed machine. If you're using a VFD, you can get an optional Foward/stop/reverse switch.
    Thank you sir for your response.

    It is safer to have the belt running towards the ground then so I would grind edge up and polish edge down? That is a safer way to do things is it?

  6. #6
    Join Date
    May 2012
    Location
    Grande Prairie Alberta
    Posts
    32
    Quote Originally Posted by Geoffrey View Post
    Thank you sir for your response.

    It is safer to have the belt running towards the ground then so I would grind edge up and polish edge down? That is a safer way to do things is it?
    Sorry if that sounded rude, just re-read my post.

    I have never used a 2x72 so ideas that are "good" in my head might not transfer to safe operation in reality. Better to learn here before making the mistake and hurting myself.

  7. #7
    Join Date
    Feb 2010
    Location
    Woodland Park, CO.
    Posts
    191
    I have a variable speed DC motor grinder with a reverse switch on my controller and I never have the need to use it. My belts are always turning down towards the ground and I do my hollow grinds with edge up, also sharpen with edge up. But with that being said, different strokes for different folks and everybody develops there own way of doing things. I would lean towards what Ed recommends or at least try your sander with your belt running down towards the ground before investing in a drum switch. If you need to sharpen with edge down, flip the knife over and give it a try or play with scrap metal to see what you like. Belt polishing is usually done edge up. When I gave advice earlier I was thinking switches not practicality on belt sanders, Thanks Ed !
    Clint

  8. #8
    I was considering installing a drumswitch but after reading this thread I just changed my mind and saved some $$$

  9. #9
    Join Date
    Sep 2009
    Location
    Toronto, Ontario, Canada
    Posts
    468
    If you still decide you want to give it a try, a drum switch will work, but may not be necessary.


    For example, you want to use this motor on a fixed speed disc later.

    I would still keep your original on off switch and just add an additional direction switch.

    Drum switches are expensive and have lots of connections and that scares lots of people away.
    You can just add another $10 toggle switch and skip the $100 drum switch.
    The toggle switch will also fit into existing boxes easily too.


    On you baldor motor, you give no info to work with- photos and motor model numbers help.
    Baldor and Leeson and the good motor mfgrs have websites with diagrams based on model numbers.

    Take off the cover plate for the wiring box, there is usually instructions on the inside of that cover, or on a data-plate on the motor

    On the reversible motors the instructions are often "to reverse direction swap wires # and #" Those may be labelled with colours or numbers.

    http://0.tqn.com/w/experts/Electric-...new-Dayton.jpg
    "CW rotation shaft end as shown, to reverse rotation interchange black and red"

    That's easy to understand with the wires themselves, but to wire that to a switch is not so obvious

    Start with a DPDT toggle switch rated for the motor.

    Connect the centre switch pins to the tabs on the motor for those two wires.

    Connect the wires to one end of the switch.

    Now it's just running in that direction

    Now, run two short jumper wires kitty corner in an x pattern across the switch.

    That does the same thing as pulling the wires off and crossing your arms and reconnecting them the opposite way.

    This diagram is more clear if it would be in colour, but it works.

    012_01.gif
    Last edited by 12345678910; 11-22-2012 at 11:08 AM.
    (The Count)

  10. #10
    Join Date
    Oct 2009
    Location
    Hertfordshire, England
    Posts
    698
    Count, that's great.

    It would be nice to have my disc snader reversible but cost is always a premium - I'll be looking into that some more.

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