Thread: Maybe a annealing machine bones?

Originally Posted by gonetropo

ahh gadget wait till you see selenium diode ignite, its like the ultimate dog fart from hell

a very toxic dog fart

https://www.nzhuntingandshooting.co....25/index2.html

http://www.seriousshooters.co.nz/con...prd_id=1357190

$1600

@Beaker for some reason (maybe unfairly) for this price i expect autofeed like this:
https://www.sinclairintl.com/reloadi...prod97922.aspx
I know flame isn't as cool as induction well in my geeky world anyway but if I am going to pay that much I want automation.

Got some bits rolling in. Might go for a smaller radiator. They're pretty cheap.


Sent from my E6533 using Tapatalk

Originally Posted by gadgetman

Got some bits rolling in. Might go for a smaller radiator. They're pretty cheap.


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That's cute will it cope?

Originally Posted by 300CALMAN

That's cute will it cope?

That radiator is massive overkill. Will have a 120mm computer fan mounted on it to cool the liquid in the coil and the electronics.

Originally Posted by gadgetman

That radiator is massive overkill. Will have a 120mm computer fan mounted on it to cool the liquid in the coil and the electronics.

overkill is good.

Which circuit/coil did you order?

Originally Posted by 300CALMAN

overkill is good.

Which circuit/coil did you order?

The one from the original link.

https://www.aliexpress.com/item/20A-...311.0.0.sd7CG6

I can always make a new coil. Plenty of copper tube here from trailer brakes and things.

Originally Posted by gadgetman

Got some bits rolling in. Might go for a smaller radiator. They're pretty cheap.


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mine was somewhat more 'agricultural" compared to yours but was really a proof of concept with what was lying round my bench and 5 bored minutes.
Never went any further than that for now anyway

If air-wound coils don't do what is required then a gapped ferrite core will help and allow for a lower input power. Brass' good conductivity is a problem for inductive heating. The trick for this and uniformity is to have a coil that concentrates the flux on the shoulders. The neck is easier to heat as it has shorter current paths, a lower mass of material than the shoulders and walls, and heat can only conduct out of the neck in one direction. Necks will keep up temperature-wise with the shoulders with much less input. Then the field also needs to drop away rapidly in the other direction to minimize heating in the case walls so the heating down towards the head only gets there via conduction.

Originally Posted by Puffin

If air-wound coils don't do what is required then a gapped ferrite core will help and allow for a lower input power. Brass' good conductivity is a problem for inductive heating. The trick for this and uniformity is to have a coil that concentrates the flux on the shoulders. The neck is easier to heat as it has shorter current paths, a lower mass of material than the shoulders and walls, and heat can only conduct out of the neck in one direction. Necks will keep up temperature-wise with the shoulders with much less input. Then the field also needs to drop away rapidly in the other direction to minimize heating in the case walls so the heating down towards the head only gets there via conduction.

Thanks @Puffin The magnet gap is also quite a nice reference point for the case head to assure repeated alignment.

Finally have the majority of components so will start building shortly.

Originally Posted by gadgetman

Finally have the majority of components so will start building shortly.

@gadgetman - any progress on this? Cheers

Originally Posted by The Claw

@gadgetman - any progress on this? Cheers

Too much work on lately to have a crack at it. Hopefully over the next weekend or two.