Kress diy speed control

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This topic contains 4 replies, has 2 voices, and was last updated by Profile photo of Medmike Medmike 5 months, 1 week ago.

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  • #27434
    Profile photo of Medmike
    Medmike
    Participant

    Kress 800 is in the mail from the UK, any thoughts on this for lowering speed? http://electronics-diy.com/1000w-ac-motor-speed-controller.php (many on ebay pre-made for cheap)

    Looks like it keeps load constant , per description “when the motor of the drill machine is slowed down by the resistance of the drilled object, the counter-EMF of the motor also decreases. This results to a voltage increase in R2-P1 and C3 causing the triac to be triggered earlier and the speed increases accordingly.”

    I know “Super-PID” is awesome but WAY over my (ok, my wife’s) budget.

    #27648
    Profile photo of FX
    FX
    Participant

    Doesn’t the Kress 800 already come with build in speed control from 10000 to 30000 rpm?

    #27667
    Profile photo of Medmike
    Medmike
    Participant

    FX…you are correct. The goal is to bypass built in speed control and be able to go lower than 10,000 (say for aluminum) and maintain torque. Looks like the gentleman at cnczone had an open source thread on a diy one. http://www.cnczone.com/forums/open-source-controller-boards/147042-open-source-atmel-arduino-pid-motor-control.html

    #27677
    Profile photo of FX
    FX
    Participant

    I see, sounds like an interesting project. Let us know how it goes. How low do you need to go for aluminum?

    #27697
    Profile photo of Medmike
    Medmike
    Participant

    It can be cut at high speed but lower speed can help with other kinds of material and less tool wear.

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