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  1. #1
    Join Date
    Jul 2021
    Location
    Toowoomba
    Posts
    6

    Default Fitting a single phase motor

    Hi guys, this is my first post on the forum. I am putting one of the techtop single phase motors onto my 260, but have discovered that the drive frame casting prevents it from fitting into place. I've seen some mentions on other threads about modifying the casting to take a larger motor but am nervous to go for it without getting some advice first. Can anyone please tell me whether cutting into the casting to create space for the motor is a good or bad idea? The photo is to show what I would be cutting away, in case I haven't done a very good job of explaining. Any help will be appreciated. Thanks
    Attached Images Attached Images

  2. #2
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    239

    Default

    Hi Craig

    You can cut away at the frame safely without any issues, you can cut it with a jigsaw, for some reason the there was 2 different castings with the different size cutouts and that seemed to be on C model lathes.

    Regards Steve

  3. #3
    Join Date
    Jul 2021
    Location
    Toowoomba
    Posts
    6

    Default

    Hi Steve, thanks for the reply. Just wanted to make sure I didn't do something stupid and irreversible. I'll probably end up doing it by hand with a hacksaw as I don't have good blades for the jigsaw.
    Thanks

  4. #4
    Join Date
    Jan 2009
    Location
    Holbrook, NSW
    Age
    73
    Posts
    490

    Default motor fitting

    Hi Craig,
    Cutting out the casting to fit the standard motors, available today, is something that just has to be done. The Asea motors, that Hercus fitted in some of their later machines, had a much lower profile. Most of the cheaper standardised types sold today are considerably larger. Even with the Asea motors, they still come with larger bodies as the horse power increased. Although some castings have a big enough opening, generally If you add a 3/4 hp to a machine that previously a 1/2 hp or an Asea motor, some modification will be necessary. This won't affect the function of the machine at all.
    Mal

  5. #5
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    Single phase motors are often more "lumpy" than 3 phase, because as well as a terminal box they have a capacitor or two that are attached to the motor body.
    The size and location varies between makers. I had to check various motors before finding a Teco that would fit my 260.
    The cap housing was not obstructed, but I did have to lower the terminal box a bit.
    I had the electrician retain the contactor switch and no-volt release safety feature.
    He installed a 240V part into the contactor so that would work.

  6. #6
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    This motor has been fitted to a Hercus 260 with no modification.
    The bulky terminal block and capacitor are on the opposite side from the foot mounts, and didn't obstruct anything.

    https://www.ebay.com.au/p/4034409367
    Attached Images Attached Images

  7. #7
    Join Date
    Dec 2011
    Location
    Sydney
    Posts
    505

    Default

    Motors like that have bolt-on feet that can be fitted on any of the three 'sides' of the motor other than where the capacitor housing is located. It's very helpful in some situations.
    Bill

  8. #8
    Join Date
    Aug 2009
    Location
    Adelaide
    Posts
    27

    Default Motor casting modification

    Motor conversion.jpg
    Here is a Hercus 260 modification to accept a single phase motor I did recently.
    Tools are good, more tools are better!

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