Induction annealer built around Annie

Discussion in 'Reloading Forum (All Calibers)' started by powderbrake, Nov 27, 2016.

  1. Lapua40X

    Lapua40X California Hunter Education Instructor Silver $$ Contributor

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    Very nicely done. I'm curious about your selection of the 12vdc 95cfm cooling fan. You have 115v input to the system, and a 150cfm muffin fan running on that power should draw somewhere around 1 amp so you wouldn't have to consider special switching or wire gauge restrictions and it would improve air flow dramatically. Is there a reason why the larger fan wasn't chosen?
     
  2. powderbrake

    powderbrake Gold $$ Contributor

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    Having followed the Gina-Erik thread, I needed a 12vdc power supply for the timer power and the pump motor, so I chose the 12vdc fans. The primary choice on the fan was the sound (noise) level of 41 dbA, and the highest flow volume(99 cfm), and the lowest power level (3 watts). I really didn't want a loud unit, just to move the air over the tank, and to provide some flow for the 12vdc supply and the timer, which are convection cooled units themselves.

    The Annie has an internal fan, and doesn't need extra airflow, but looking at the Annie case design with it's longitudinal fins, I felt that any airflow I could give it would help the Annie temperature and it's life. I just mounted the fan/tank/Annie in a flow path that would hit all of them, and flowing in the direction of Annie's internal fan.

    Later when I added the radiator, I just used the same fan, as I still had adequate current capacity in the 12vdc power supply. So basically I have all the air flow I need, and it is fairly quiet.
     
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  3. normmatzen

    normmatzen Silver $$ Contributor

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    I,too, am a retired analog IC Design engineer. So, I started designing my own annealer. After frying a few power MOS transistors, I found building stuff wasn't so much fun anymore, even with a professional lab in my garage from when I consulted.
    So, I became an early adopter of the ANNIE!

    I have had it almost since Fluxeon started building them. I've had plenty of time to experiment with different coils and wire types and settled for the water cooled non flux concentrater. I and my bottles of 750 Tempelac found ideal times for each of my cases I shoot.

    Then, I wanted a fixture to hold the cases in a consistent position. I saw all the solenoid dropping set-ups and decided to go the easy way.

    I bought a piece of 1/2" white plastic sheet that was 6" X 12" on ebay and carefully cut half round slots on the two sides to clear and align to the rubber feet on my Annie. The Annie sits on the back of the 12" side so the coil sits over the front of the assembly. I also bought some 0.2" dia glass rods (yup! on ebay) and drilled a 3/8" inch deep 0.2" dia or so hole under and concentric with the coil. Then, I measured carefully and made a glass rod just long enough so when I drop a case over it, the center of the neck is right in the middle of the coil. The one sticking out of the coil is the one for 6BRX cases and the short one laying on the plastic is for 284 WIN cases. The longer piece is a spare ready to be cut for 7X57 or 30-06 or maybe K31 cases. I measure them carefully and scribe a line with a small model file and snap the piece off. Then I fire smooth the end with a propane torch and I'm ready to go. Only problem in dropping cases on pointed down is that 6BR and 6brx are not heavy enough to stay down! I have to hold the primer end down while it anneals as
    the inductive force wants to center the case in the field and that doesn't agree with the part of the case I want to anneal!

    My pump is a $2 ebay aquarium pump and today after annealing 100 6BRX cases, the 1 quart of water in the reservoir barely got warm to the touch. Annie base.jpg
     
    Last edited: Jan 5, 2018
  4. powderbrake

    powderbrake Gold $$ Contributor

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    Simple, elegant solution, no fan needed.
     

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