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Benvarine's DIY stir plate build
  • C_BC_B
    Posts: 77,334
    This discussion was created from comments split from: DIY Stir Plate Build.
    "On it. I hate software." ~Cpt Snarklepants
  • BenvarineBenvarine
    Posts: 1,606
    Just put the poly on it tonight.
    image.jpg
    2592 x 1936 - 1M
  • BenvarineBenvarine
    Posts: 1,606
    And the top.
    image.jpg
    2592 x 1936 - 1M
  • BenvarineBenvarine
    Posts: 1,606
    And the guts. I'm no electrician, but it seems to work. I am buying a stir bar tomorrow, so I'll add the tornado pic if it works.
    image.jpg
    2592 x 1936 - 1M
  • C_BC_B
    Posts: 77,334
    Ben, you should make your own build thread that thing looks awesome!
    "On it. I hate software." ~Cpt Snarklepants
  • C_BC_B
    Posts: 77,334
    C_dubbs said:

    Ben, you should make your own build thread that thing looks awesome!


    @Benvarine
    I did it for you :D

    "On it. I hate software." ~Cpt Snarklepants
  • C_BC_B
    Posts: 77,334
    Where did you get that box? I love it.
    "On it. I hate software." ~Cpt Snarklepants
  • frydogbrewsfrydogbrews
    Posts: 44,679
    looks like a cigar box, great idea
  • FuzzyFuzzy
    Posts: 46,786

    looks like a cigar box, great idea



    you should put some cigars in there.
    "Oh, you were serious? I was drunk."-C_B
  • FuzzyFuzzy
    Posts: 46,786
    cheap ones. tell urryone that it's tobacco powered.
    "Oh, you were serious? I was drunk."-C_B
  • ThymThym
    Posts: 103,164
    i think he mentioned somewhere else that it was from Michaels crafts store
    The only thing between me and a train wreck is blind luck..... - Kenny
  • scoobscoob
    Posts: 16,617
    Lakewood said:

    i think he mentioned somewhere else that it was from Michaels crafts store


    Yes, I believe in my my build thread.
    Jesus didn't wear pants
  • C_BC_B
    Posts: 77,334
    azscoob said:

    Lakewood said:

    i think he mentioned somewhere else that it was from Michaels crafts store


    Yes, I believe in my my build thread.

    I suppose I could have snagged another couple posts....
    "On it. I hate software." ~Cpt Snarklepants
  • BenvarineBenvarine
    Posts: 1,606
    Yes. From Michaels. But I have issues.
  • BenvarineBenvarine
    Posts: 1,606
    It won't spin the bar. It throws it around, and that is on the slowest setting. My potentiometer does not crank so low as to stop the fan. Where could my trouble be?

    Plug is 5v output from a cell phone charger.
    Potentiometer is whatever azscoob recommended.
    Fan is 12v 1.5 amp.

    Thoughts?
  • frydogbrewsfrydogbrews
    Posts: 44,679
    throws it around? like the whole box? is it just unbalanced or not centered? if you are talking electrical things, i have no input.
  • BenvarineBenvarine
    Posts: 1,606
    It throws the stir bar around. I was concerned the magnet wasn't centered, but the fan operates fine on its own. I am not sure how to officially center it. I eye-balled it, looks okay.
  • frydogbrewsfrydogbrews
    Posts: 44,679
    can you mount the box onto something heavy, like a steel plate? i have a few of those if you need one. the torque might just rip the box apart though, but that's still kinda fun.
  • BenvarineBenvarine
    Posts: 1,606
    The box is fine, it's the stir bar that won't spin properly, it just flies to one side of the flask. It means it might be spinning too fast, but that's just a guess.
  • ThymThym
    Posts: 103,164
    the balance of the stir bar,
    the concentricity of the drive magnets to the fan rotational axis
    and the spacing of the drive magnets relative to the stir bar magnets

    all play a part in how fast you can spin it before it spins off.
    The only thing between me and a train wreck is blind luck..... - Kenny
  • ThymThym
    Posts: 103,164
    how fast is the fan spinning when you are at the slowest pot setting?
    The only thing between me and a train wreck is blind luck..... - Kenny
  • ThymThym
    Posts: 103,164
    how much does the fan speed vary with the pot sweep?
    The only thing between me and a train wreck is blind luck..... - Kenny
  • BenvarineBenvarine
    Posts: 1,606
    What the hell does that mean. How do I get it to spin right?
  • ThymThym
    Posts: 103,164
    can you tak a picture of how you wired the pot?
    The only thing between me and a train wreck is blind luck..... - Kenny
  • BenvarineBenvarine
    Posts: 1,606
    Lakewood said:

    how much does the fan speed vary with the pot sweep?



    Not much. I was expecting more. Where is the issue?
  • ThymThym
    Posts: 103,164
    Benvarine said:

    What the hell does that mean. How do I get it to spin right?



    the drive magnets (on the fan side) should be spaced roughly the same distance apart as the spin bar magnets (otherwise it wont have the strongest bond you can get)

    those drive magnets should be placed such that they are equidistance from the fan ais so they sweep out one continuous, perfect circle. if they are offset it will cause the spin bar to accelerate in multiple axis' and you wont be able to hold it at very high speed.
    The only thing between me and a train wreck is blind luck..... - Kenny