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  1. #1
    New Member
    Join Date
    Apr 2006
    Posts
    24
    Location
    Eastern NC
    Tractor
    JD 5310

    Default Replacing Drillpress AC motor with DC motor?

    Hello,
    I have a 3/4 horse dp from a big box store and would like to slow down the chuck speed below the 200 rpm allowed by the belt/pulley system. It looks like it would be fairly easy to replace the AC 3/4 horse with a 90 Volt DC variable speed motor and a controller. Has anyone done this?

    I did a little research on the web and the motors and controllers seem widely available at surplus houses, ebay, etc. They are a little pricey, but would make the dp much more versatile and easy to adjust the speed. I'm not sure if the DC motor should have equal or more hp than the orginal AC motor for low speed torque.

    Any ideas, thoughts or suggestions would be appreciated.

    -Vinnie

  2. #2
    New Member
    Join Date
    Apr 2006
    Posts
    24
    Location
    Eastern NC
    Tractor
    JD 5310

    Default Replacing Drillpress AC motor with DC motor?

    Hello,
    I have a 3/4 horse dp from a big box store and would like to slow down the chuck speed below the 200 rpm allowed by the belt/pulley system. It looks like it would be fairly easy to replace the AC 3/4 horse with a 90 Volt DC variable speed motor and a controller. Has anyone done this?

    I did a little research on the web and the motors and controllers seem widely available at surplus houses, ebay, etc. They are a little pricey, but would make the dp much more versatile and easy to adjust the speed. I'm not sure if the DC motor should have equal or more hp than the orginal AC motor for low speed torque.

    Any ideas, thoughts or suggestions would be appreciated.

    -Vinnie

  3. #3
    Super Member Inspector507's Avatar
    Join Date
    Mar 2002
    Posts
    5,823
    Location
    Central Ohio

    Default Re: Replacing Drillpress AC motor with DC motor?

    Have you looked into the variable speed add-on controls for a router?

  4. #4
    Super Member Inspector507's Avatar
    Join Date
    Mar 2002
    Posts
    5,823
    Location
    Central Ohio

    Default Re: Replacing Drillpress AC motor with DC motor?

    Have you looked into the variable speed add-on controls for a router?

  5. #5
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    49,182
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Replacing Drillpress AC motor with DC motor?

    For a DC motor you can use a pulse width modulator based motor control... for an ac motor ( that uses ac, not a universal motor using dc ), you can use a triac based controller.. like an industrial lamp dimmer. Find one rated for your amp load. Many o fthe older ones said 'not for inductive loads' however should work anyway.. especially the big ones for par cans...

    I put together a 4 outlet box with 2 outlets as straight thru ac, and the other two wired off a lamp dimmer triac, and then mounted this on a HD extension cord. I've used it as a lamp dimmer for trouble lamps and as a speed control for a cheap single speed hand drill...

    Soundguy

  6. #6
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    49,182
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Replacing Drillpress AC motor with DC motor?

    For a DC motor you can use a pulse width modulator based motor control... for an ac motor ( that uses ac, not a universal motor using dc ), you can use a triac based controller.. like an industrial lamp dimmer. Find one rated for your amp load. Many o fthe older ones said 'not for inductive loads' however should work anyway.. especially the big ones for par cans...

    I put together a 4 outlet box with 2 outlets as straight thru ac, and the other two wired off a lamp dimmer triac, and then mounted this on a HD extension cord. I've used it as a lamp dimmer for trouble lamps and as a speed control for a cheap single speed hand drill...

    Soundguy

  7. #7
    Elite Member Cliff_Johns's Avatar
    Join Date
    Jan 2004
    Posts
    2,697
    Location
    Northern Illinois
    Tractor
    JD 4110

    Default Re: Replacing Drillpress AC motor with DC motor?


    You can try it, but I think you will find out that it stalls out easily when run a low speed.

    Cliff

  8. #8
    Elite Member Cliff_Johns's Avatar
    Join Date
    Jan 2004
    Posts
    2,697
    Location
    Northern Illinois
    Tractor
    JD 4110

    Default Re: Replacing Drillpress AC motor with DC motor?


    You can try it, but I think you will find out that it stalls out easily when run a low speed.

    Cliff

  9. #9
    Gold Member
    Join Date
    Jan 2006
    Posts
    370
    Location
    Merrimack county, NH
    Tractor
    JD 110 TLB

    Default Re: Replacing Drillpress AC motor with DC motor?

    Many treadmills have an approx 130 volt dc motor in them with a controller. Maybe a dump run is in order?

  10. #10
    Gold Member
    Join Date
    Jan 2006
    Posts
    370
    Location
    Merrimack county, NH
    Tractor
    JD 110 TLB

    Default Re: Replacing Drillpress AC motor with DC motor?

    Many treadmills have an approx 130 volt dc motor in them with a controller. Maybe a dump run is in order?

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