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mill motor runs 1/2 speed in reverse ?

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  • mill motor runs 1/2 speed in reverse ?

    so i bought a small mill to do wood working on 3 weeks ago , a king KC-20VS (same grizzly 704 or b20... i think )
    for some reason it runs half the speed in reverse , at first i thought maybe just the gears running weird with heavy grease ... but thats not it , it should have been run in well by now .
    it runs about 2200rpm forward and 1060rpm in reverse , same gear and the same thing for low gear (about 1/2)
    anyone have this problem ? easy to fix ?
    as for the machine in all other ways im pretty happy .
    the people who cover the warranty told me id have to take it to one of the tech people about :30 away to test it , seems like a pain . they were not even sure of the name of the person i was suposed to talk with

  • #2
    If the spindle motor is brushed dc it may have been designed that way.

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    • #3
      Jezx, i have the same mill, (King model KC-20VS) and i have that same RPM. I haven't found it a problem, but don't use reverse hardly at all.

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      • #4
        i desided to look at the crappy wire diagram they sent...
        there it was in small print (1/2 speed ) writen beside a section of the wiring for the roll switch
        basicly there is a wire they had hooked that causes it to run half speed on the reverse side of the switch .not sure why .
        also not sure why i never thought of looking at the wiring before but maybe because right on the front it has printed ''MACHINE MUST BE GRPIMDED AT ALL TIMES "" and a parts list with missing numbers .... didnt think i could trust the printing much
        i can't beleive i called their tech guys and they said '' it's impossable to figure it out over the phone , you'd need to take it to a specialist near you ''
        i know very lil about wiring , but i think the company should have know this right away .

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        • #5
          if anyone else is looking for this wire , its very easy to fix , 4 bolts for the ON OFF panel and then its the first removable plug on the panel to the left . the wire goes to the bottom of the left side of the roll switch . , i could post a picture .
          i only have a few cutters needing reverse , but figured i better fix it now before i needed to later ,,if i ever use them .

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          • #6
            Maconas post is probably correct above.

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            • #7
              Don't forget, things have the habit of unscrewing when run in reverse.

              Regards Ian.
              You might not like what I say,but that doesn't mean I'm wrong.

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              • #8
                so you think it shouldnt run full speed in reverse? .
                im not sure what the motor is . i'll have to check . i thought if it ran 2000rpm one way it would be ok the other way but i dont know that much about motors

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                • #9
                  The motor is supposed to be 1HP, but like all BS motor ratings now , i say it's probably 5/8 or 1/2 HP.
                  A version of that mill is sold by Busy Bee, but they don't have the longer table (x axis) the last i noticed.
                  For a long time they only had the MT spindle ,but now i think they finally sell it with the R8 spindle.
                  What are you doing that you need the reverse higher speed for?

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                  • #10
                    Originally posted by JEZX View Post
                    so you think it shouldnt run full speed in reverse? .
                    . i thought if it ran 2000rpm one way it would be ok the other way
                    The majority of DC motors will run bi-directional, there is one exception and that is a DC motor with the brushes offset for maximum efficiency in one particular direction, sometimes seen on T.M. motors.
                    Max.

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                    • #11
                      i bought it just for wood working , so running at 1000rpm sucks pretty bad . i must be the only person with backwards cutters

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                      • #12
                        Originally posted by JEZX View Post
                        i bought it just for wood working , so running at 1000rpm sucks pretty bad . i must be the only person with backwards cutters
                        No, "backwards" cutters are common for use on multi spindle production machines used for the Flat pack furniture manufacturers.

                        Regards Ian.
                        You might not like what I say,but that doesn't mean I'm wrong.

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