Results 1 to 4 of 4

Thread: Power Supply with Nichrome Wire

  1. #1
    Join Date
    Jan 2018
    Location
    Saratoga Springs, UT
    Posts
    64
    Post Thanks / Like

    Default Power Supply with Nichrome Wire

    Hey Everyone- Has anyone used the 12V 350W 30A power supplies with Nichrome 20 Gauge Resistance Wire to make a DIY foam cutter? I've seen other smaller power supplies used, but curious if any of you have tried with the higher AMPs.

  2. #2
    Join Date
    Dec 2015
    Posts
    90
    Post Thanks / Like

    Default Re: Power Supply with Nichrome Wire

    Isnít it the resistance that determines the amperage if the voltage is constant?

    E=IxR

    So in theory a bigger power supply should let you use a shorter wire? It would run at a higher amperage and may burn the wire up if you exceeded the rating for the wire.... so you would still need to use the same length wire so it doesnít burn itself up, but if you have the power supply already then I donít see why it wouldnít work.

    That being said, i might be missing something here. Iíve never built one, Iím just spitballing here while we wait for someone who knows the answer for absolute certain to chime in.


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Dec 2016
    Location
    Anchorage, AK
    Posts
    352
    Post Thanks / Like

    Default Re: Power Supply with Nichrome Wire

    I have made foam cutters for my RC airplane projects. Your best bet is a high current ~10 amp variable voltage supply. Some people use a fixed supply and use a wire wound "variac" to control the voltage. Those are kind of hard to find, usually older and made of brittle bakelite, and expensive.
    I have even seen people put several nails in a board wrap the nicrome wire from nail to nail and use a large AWG jumper to short between different nails to increase the voltage. That takes a bit of experimenting to get the right setup. I have several rolls of different AWG nichrome left over from my grandpa from 50 years ago.
    Last edited by aknflyer; 05-22-2020 at 11:40 PM.

  4. #4
    Join Date
    Nov 2015
    Location
    The Netherlands
    Posts
    79
    Post Thanks / Like

    Default Re: Power Supply with Nichrome Wire

    I use a dc-dc converter and a laptop psu. Then you can vary voltage on the fly and costs almost nothing. I have made 3 wire-cutters, 1 horizontal, 1 vertikal and one "free hand", looks like a bow, only missing the arrow
    Errors for fun only.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •