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Ben's Home-Brew Solder Reflow Oven 2.0 Episode -- Episode 116

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element14's The Ben Heck Show

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Ben's fed-up with the difficulty of soldering surface-mount components by hand and builds a new reflow oven to keep in his shop. He transforms an inexpensive toaster over into a vital tool for electronics engineers and tinkerers. In this updated oven, he uses two thermal couples to ensure even heat distribution and effective reflow.
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  • in reply to benheck

    For anyone building at home and modifying the profiles

     

    int profiles = 0;

     

     

    int profile[4][6] = {

      {

        75,140,45,125,205,20                                    }

      ,

      {

        75,140,45,125,205,20                                    }

      ,

      {

        75,140,45,125,205,20                                    }

      ,

      {

        75,140,45,125,205,20                                    }

    };

     

     

    String profileNames[4] = {

      "Ol' Fashioned Pb", "New Fangled RoHS", "Profile 3       ", "Profile 4       "

    };

     

    the format of the profiles is {Ramp 1 0-255, 1st target temp, hold seconds at 1st target, Ramp 2, 2nd target temp, hold seconds at 2nd target} 

    Ramp rate is kind of a misnomer, its just the analog write value but because our relay is a zero cross and we aren't accounting for the cross, it doesn't exactly work as good as a PWM value would.

     

    The ROHS profile definitely needs changing, probably a 220 target.  Your results may vary but you will definitely have to tweak for your own oven and possibly it could change depending on your board as well.

  • in reply to colecago

    Hi,

    If I understand this correctly the profile is broken into triplets (ie PWM,Temp, Sec to hold @ temp) and that repeats. So looking at this there it ramps twice but my question if my assumptions are correct is can you add another triplet on to the profile (ie preheat triplet, soak triplet, reflow triplet)?

     

    Thank you.

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