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mill motor runs 1/2 speed in reverse ?

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  • Circlip
    replied
    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.

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  • JEZX
    replied
    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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  • MaxHeadRoom
    replied
    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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  • sasquatch
    replied
    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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  • JEZX
    replied
    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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  • Circlip
    replied
    Don't forget, things have the habit of unscrewing when run in reverse.

    Regards Ian.

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  • sasquatch
    replied
    Maconas post is probably correct above.

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  • JEZX
    replied
    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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  • JEZX
    replied
    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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  • sasquatch
    replied
    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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  • macona
    replied
    If the spindle motor is brushed dc it may have been designed that way.

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  • JEZX
    started a topic mill motor runs 1/2 speed in reverse ?

    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
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