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91
Software Tools / Optimising cutting lists
« Last post by Will_D on May 20, 2018, 02:55:11 PM »
Hi guys, am just about to order some Bosch/Rexroth T slot extrusions to build a brew stand for my HB equipment.

So I have a cutting list of lengths and quantitys I need to build it.

I can order 1,2,3 or 5.6 M lengths. (all are basically the same per metre price so no benefit in getting long stock lengths)

There must be some software (free!) that will optimise cutting up these stock lengths.

Any ideas or do I slog away in Ecel??
92
Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by awemawson on May 20, 2018, 01:16:58 PM »
Well Phil, at the time I was struggling to make my own invertor furnace driver using massive IGBT's - it worked but was very inefficient. But I had a search set up on ebay for quite a while for 'Induction Furnace' - this one popped up several times and failed to reach it's reserve so I opened negotiations - I honestly can't remember what i paid - it wasn't a give away but far far less than the chap was initially asking.

However I ended up building a building to house it at the old place, buying an Agrecko 100 kva generator that I had to rebuild, and rebuilt the furnace bodies including commissioning custom crucibles.

Then I moved, built ANOTHER building to house it but haven't actually re-commissioned it (yet Matthew!) so I hate to think what it's actually cost me  :bugeye:

. . . . one day  . . . .
93
Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by hermetic on May 20, 2018, 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!
94
Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by vintageandclassicrepairs on May 20, 2018, 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

95
Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by eskoilola on May 20, 2018, 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 !
96
Metal Stuff / Re: 100Kw CFEI Induction Furness
« Last post by awemawson on May 20, 2018, 05:56:34 AM »
It is very tempting Matthew but there are things ahead of it on the 'round-tuit' list
97
Gallery / Re: Annoying sprung handles on machines
« Last post by mattinker on May 20, 2018, 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 May 20, 2018, 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 May 20, 2018, 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 . . . . .
100
Gallery / Re: Annoying sprung handles on machines
« Last post by jb3cx on May 20, 2018, 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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