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Induction brass annealer redux

Did you use insulation on your copper tubing? Pictures of your coil might help. 3.5 seconds for a .223 is a long time. A build I did for someone else took only about 1.4 seconds.
 
NemesisXB said:
Measured the voltage to the ZVS board. Drops from 48 to 44 so the supply is current limiting. How can I fix this? Should I rather try a single layer coil?
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It appears that your power supply doesn't provide sufficient power. (the voltage drop is a clear indicator ~11.5 amps * 44 volts ~= 500 watts) You need at least 650 or more.
 
itchyTF said:
Did you use insulation on your copper tubing? Pictures of your coil might help. 3.5 seconds for a .223 is a long time. A build I did for someone else took only about 1.4 seconds.
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Yes I did. I also thought is was slow. 20221015_221934.jpgthe bigger coil insulation is discolored because I initially tested without cooling.
 
oliverpsmile said:
It appears that your power supply doesn't provide sufficient power. (the voltage drop is a clear indicator ~11.5 amps * 44 volts ~= 500 watts) You need at least 650 or more.
Click to expand...
I thought as much. The supply is only rated 600w. I thought it would be enough as reading this thread it seemed people were using about 9.5A. I don't know why it is only doing 500w
 
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NemesisXB said:
Long time lurker, first time poster here. I just completed my build. I have some "concerns". 223 cases anneal nicely, 3.5 seconds, visible line just below the shoulder. However, 308 at 8 seconds only the tip of the case starts glowing. What is the expected anneal time of a 308 case?

Also, my unit draws 11.5A with or without a case in the coil. Is something wrong, maybe with my coil? I tried 2 coils,
first 28mm ID, 6.5 turns, 2 layer, 3.18mm copper tube, coil height 20mm.
Then 20mm ID, 8 turns, 2 layer, 3.18mm copper tube, coil height 23mm.

Both perform about the same. The 28mm one takes 4.5s for 223 and the 20mm one takes 3.5s.

Is there an issue with my coil design? Or perhaps another issue with my unit?
Click to expand...
Mine take about 6 sec to anneal .308Win. Power supply 24VDC, current draw at 15A level. I use single layer coil 10 turns of 3/16" tube in diameter. The inner diameter of coils is 20mm.
 
itchyTF said:
I used a 1,000W, 36v supply and it was running at about 22-24A on larger cases.
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Thanks, I am going to try and source a 1000W supply.
Stanislav Plagov said:
Mine take about 6 sec to anneal .308Win. Power supply 24VDC, current draw at 15A level. I use single layer coil 10 turns of 3/16" tube in diameter. The inner diameter of coils is 20mm.
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I am going to try a single layer coil first as the 1000W supply will take a while to get here.
 
Stanislav Plagov said:
Mine take about 6 sec to anneal .308Win. Power supply 24VDC, current draw at 15A level. I use single layer coil 10 turns of 3/16" tube in diameter. The inner diameter of coils is 20mm.
Click to expand...
The induction coil uses an oscillating magnetic field to induce internal friction/heat in the metal. Magnetic fields follows the inverse cube law, so small changes in distance from the coil to the metal (brass case) make a huge (to the power of 3) change in coil efficiency. My coil inside diameter is 16mm and still allow me to anneal everything from 5.56 Nato to 300 Weatherby Mag in under 3 seconds. I would try decreasing you inside coil diameter.
 
VenatusDominus said:
The induction coil uses an oscillating magnetic field to induce internal friction/heat in the metal. Magnetic fields follows the inverse cube law, so small changes in distance from the coil to the metal (brass case) make a huge (to the power of 3) change in coil efficiency. My coil inside diameter is 16mm and still allow me to anneal everything from 5.56 Nato to 300 Weatherby Mag in under 3 seconds. I would try decreasing you inside coil diameter.
Click to expand...
What power supply do you use and how much current it draws? Thank you!
 
Alright, trouble shooting time and looking for pointers.

I pulled it all apart to isolate the problem.

The problem: when brass is inserted into the induction coil the ZVS board and the PSU lose power then come back when load is removed from the coil.

To find this is the problem I disconnected everything and now have the PSU plugged right into the ZVS.

Faulty ZVS board?

Thanks.
 
Did you include an ammeter in your build? If so, what is the current and voltage before and after brass insertion? What is the voltage and power rating for the power supply?
 
itchyTF said:
Did you include an ammeter in your build? If so, what is the current and voltage before and after brass insertion? What is the voltage and power rating for the power supply?
Click to expand...
48V, 600W AC-DC power supply, turned down to 44v

I have the 20A ACS712 Current sensor but didn't see anything displayed.

Watching the green LED's on the PSU and ZVS, they are green. When brass is inserted into the induction field, there is a loss is power. The PSU and ZVS LED's dim out. When the load is removed from the field, power is restored.
 
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