The world of model and hobby engineering

Subscribe
The Modelling Hub Logo

The world of model and hobby engineering

Subscribe
Buy Latest Issue

Forums

Help

Register

Log in

3 phase vs single phase

Advert
New Replies
Report Bug
Help/FAQs

3 phase vs single phase

Home › Forums › General Questions › 3 phase vs single phase

Viewing 2 posts - 51 through 52 (of 52 total)
1 2 3
  • Author
    Posts
  • 10 December 2018 at 17:48 #384910
    Roger Williams 2
    Participant
      @rogerwilliams2

      Hello all, thnks for the replies. When I turn the pot down, the motor RPM reduces with the lowering of the frequency on the display. Theres no danger of the spindle rotating because I disengage the clutch. I rarely touch the Pot, just leaving the VFD at 50hz.

      28 December 2018 at 19:30 #387997
      sean logie
      Participant
        @seanlogie69385
        Posted by Mark Rand on 08/12/2018 23:02:23:

        Sean, an important question that no one has asked yet:- What lathe is it?

        1/2hp is suitable for a Myford sized lathe, but 3/4 is better for even an ML7 (I speak from experience). A lathe that's sized for a 2hp motor is not going to be happy with larger work or more aggressive cuts if hobbled by a 1/2hp motor.

        In terms of power consumption, the losses of a 2hp single phase motor will be greater than those of a 1/2hp single phase motor or 3ph motor + VFD, but the difference is likely to be no more than 25-50W. I.e.. 3/5 of 5/8 of F-all, as one of my colleagues used to say.

        The suggestions of getting a plug in power meter are your best bet. They are cheap these days (especially when Aldi or Lidl have got them on sale, but also from a number of online sellers), and can give you a good idea of just what in the house is eating the power.

        Before you do anything else though, have you got an immersion heater that someone's turned on? smile o

        Hi Mark , the 2hp motor was total overkill . The lathe is 12×24 Fortis (clausing derived). I've now fitted the 1/2hp motor now , I do notice a difference and in future will have to be more patient in my turning …ie… smaller cuts 🤔. I'll probably look for a 3/4-1hp motor in the future .

      • Author
        Posts
      Viewing 2 posts - 51 through 52 (of 52 total)
      1 2 3
      • Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

      Latest Replies
      Report Bug
      Code of Conduct
      Help & FAQs
      Advert

      Latest Replies

      Home › Forums › General Questions › Topics

      Viewing 25 topics - 1 through 25 (of 25 total)
      Viewing 25 topics - 1 through 25 (of 25 total)

      View full reply list.

      Advert

      Latest Issue

      Subscribe
      Buy Latest/Back Issues

      Newsletter Sign-up

      Latest Replies