Announcement

Collapse
No announcement yet.

Surface Grinder motors choice.

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    A cap start motor used with a run capacitor, can be much smoother than an ordinary so-called "split-phase" motor having no capacitor. Relatively close to 3 phase performance can be obtained if the load is pretty constant. A grinder in the cut is relatively constant load in a given material and depth of cut, so it is at least possible.

    A run cap can be added to a cap-start motor, even if it did not originally have one, although you do want to check the resistances of the windings to be sure you do not overheat the start winding with continuous current.
    CNC machines only go through the motions

    Comment


    • #17
      Originally posted by engineerd3d View Post
      Mine has a v-belt pulley on the back of the spindle, but the pulley is loose and probably not the original one. I was thinking of using an automotive style belt on my machine as they seam to have very nice flexibility as well as a better balance job than vee belts. I figured I would turn a couple of pulleys for this grinder and see where that takes me.
      buy a high quality belt.....Any variation in the belt can be a major source of vibration as it passes over the pulleys. Another vote for a well balanced 3P motor. The lighter the grinder, the more balance matters....SG grinding motors are suppose to be much better balanced than a run of the mill motor
      in Toronto Ontario - where are you?

      Comment


      • #18
        I used to (and still do I guess) collect single phase motors
        that were exceptionally quiet. I found 1 out of 10 were
        actually quiet enough not to vibrate around on a steel work
        bench. Balance yes, but also extra potting on the windings
        makes a difference. Interesting that Jerry notes that cap
        start / cap run motors are pretty quiet. I will take notice
        now that I hear him say that. I think single phase Baldor
        buffer and grinder motors are cap run. Notice they start
        real slow and don't seem to have a click from a starting
        switch? I bet they have a potential relay to start them.
        Anyhow, hunt those quiet single phase motors. They are
        kinda rare.

        --Doozer
        DZER

        Comment


        • #19
          Originally posted by Doozer View Post
          .... I think single phase Baldor
          buffer and grinder motors are cap run. Notice they start
          real slow and don't seem to have a click from a starting
          switch? I bet they have a potential relay to start them.
          Anyhow, hunt those quiet single phase motors. They are
          kinda rare.

          --Doozer
          Those may be "PSC" motors, OR have a solid state relay replacing the switch. If just one motor run type capacitor, probably PSC. Those have no switching at all, and can be very smooth, plus may have close to a 1.0 power factor at near full load.
          CNC machines only go through the motions

          Comment

          Working...
          X