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Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by hermetic on Today at 01:02:29 PM »
where the devil do you get this kit! I am so jealous, it even has a big turney wheel on it! I am afraid it would turn my 100A three pahse supply inside out, wouldn't want the electric bill, but that is a real pro piece of kit! Cold running water, and hot running metal on tap!
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Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by vintageandclassicrepairs on Today at 08:31:22 AM »
Hi Andrew and All,
Not directly related to this thread but it reminded me of when I worked on Alstom Generator rotors
Induction heating is used to expand  the rotor end bells for removal and refitting
Water cooled cables are wrapped around the end bell and fed from 2 phases of the station standby diesel generator, I cannot remember the power needed but the diesel engine was a V12 with a massive turbo on each bank of cylinders, It was such a smooth running engine a 50p coin sat on edge on the engine block stayed there, the noise was something else though !!!

John

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Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by eskoilola on Today at 06:19:22 AM »
Ahhh....
I am rather surprised that I quessed correctly the setup of the heater coil in relation to the crucible. There is a reason why it sits on top of it instead of being casted as a part of the crucible. Thremal expansion of copper is quite a lot larger than that of the crucible material. Built this way the crucible will not crack as the coil can expand when it warms up.

Thanks for these pictures !
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Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by awemawson on Today at 05:56:34 AM »
It is very tempting Matthew but there are things ahead of it on the 'round-tuit' list
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Gallery / Re: Annoying sprung handles on machines
« Last post by mattinker on Today at 05:47:19 AM »
I did something similar on my mill for Z axis. Just don't forget to unlock! Imagine how I know!

Regards, Matthew
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Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by mattinker on Today at 05:45:18 AM »
Great stuff Andrew, this was the project where I got to "know" you, please resurrect!!

All the best, Matthew
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Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by awemawson on Today at 05:36:35 AM »
In fact I have two 'furnace bodies' - one is arranged to tilt to pour in a conventional manner, where as the other inverts - the mould being clamped to the top so the metal is never exposed to the atmosphere.

The pouring one I totally rebuilt and upgraded the tilting mechanism using 'air over hydraulic' control

It would be fun to get it all fixed up again sometime . . . . .
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Gallery / Re: Annoying sprung handles on machines
« Last post by jb3cx on Today at 05:29:35 AM »
Hi Joules,
            Years ago I had a KRV 3000.the handles used to fold flat against the hand wheel .the guy I bought the machine off had them fitted as he got caught up a couple of times ,seemed to solve the problem for him,
Peter
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Metal Stuff / 100Kw CFEI Induction Furness
« Last post by awemawson on Today at 05:28:59 AM »
eskoilola's thread on building his induction furnace awakened my interest in this subject, and to my amazement I found that I still have pictures of my setup from 2006 when I was working on mine before we moved here 11 years ago.

Rather than hijack his thread I thought I'd post the pictures here.

. . . . maybe when / if I've finished the Beaver TC 20 CNC lathe this might be the next resurrection thread  :ddb:


The big blue box takes in 3 phase 415v AC power, and rectifies it and resonates a tank circuit, the coil of which is wrapped around the crucible, and the capacitor bank is in the box. The resonant frequency is determined by a microprocessor that pings the tank - measures the frequency then excites it at this frequency - the required frequency varies with the charge of metal in the pot

The 'furnace body' is remote from the driver and connected via 70 mm CSA cables that are threaded inside rubber 'brewers hose' that have water pumped down to prevent the cables melting (huge circulating currents involved). There is a separate chiller unit that keeps the water cool.
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Project Logs / Re: Induction heater project
« Last post by awemawson on Today at 04:05:55 AM »
The coil needs to be closely associated with it's resonating capacitor bank - the circulating currents are enormous. Mine adjusts resonance frequency dependant on the charge in the crucible, but is nominally 3kHz

The tank capacitors need very careful specifying if they are to survive

Rather than hijack this interesting thread I have started another with some pictures of my 100kW furnace here :

https://madmodder.net/index.php/topic,12596.0.html
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