A footpedal control for my Dremel

In this video I am adapting a sewing machine pedal to provide variable speed to my small Dremel drill. It’s not really suitable as the pedal is only rated to handle 80 Watts (0.42 Amps at 240 Volts) while the Dremel can take up to 125 Watts (0.52 Amps) of power, it should be alright for light work.

To control the power the footpedal has two stacks made of loose carbon disks, initially when the pedal is pressed power is passed through these and as more pressure is applied these compress to lower the resistance and allow more power through. When fully on, a metal disc engages across two contacts to allow all the current to pass. I think I would like to have a pedal that could handle more current, possibly something based around how a modern dimmer switch works.

2 thoughts on “A footpedal control for my Dremel”

  1. Hi,
    I haven’t found another way to contact you, so I’m writing you here. Need help with Tenma 21-1130 I saw that you have a theme exactly with this model.
    The station switches on and on no matter if I turn on the hot air or the iron, and they can both start working normally at the same time. Shortly after, the displays are reset and stop working. Please, if you have any idea what the problem might be, write. I will try to send you a video with the problem.

    Kind regards, Diyan Petrov.

    1. Hello Diyan
      Sorry, but I have never seen that problem, I’m guessing that something on the controller board is overheating, perhaps a power transistor isn’t connected to a heat-sink properly? A good place to ask for help would be the EEVblog forum: https://www.eevblog.com/forum/index.php
      Good Luck

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