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91
New from Old / Re: Resurrection of a CFEI 100 KVA Induction Furnace
« Last post by awemawson on January 21, 2021, 03:59:43 PM »
Sounds like chinese aluminium! not enough copper for duralumin, nowhere near enough zinc for zamak/mazak type alloy, so it must be  mongrel aluminium! I like the look of that Analoy box of tricks. Clever stuff! How is the water level?
Phil

No more major floods but still loads of condensation on  the floor the minute we go from cold to marginally warmer
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New from Old / Re: Resurrection of a CFEI 100 KVA Induction Furnace
« Last post by awemawson on January 21, 2021, 03:15:50 PM »
I've no doubt that the die-casting WAS made in China - much Dell stuff is / was but it actually was a very well made item.

No doubt the Chinese Dell assembler would have subbed out the die casting and although the alloy would have been specified the correct specification material probably wasn't used.

Subbies not using the correct specification materials has happened before. The MOD had a new sniper rifle, developed by Accuracy International who were a small outfit. When many more than they could provide were ordered the manufacture was subbed out and the wrong steel was used for the firing pin resulting in dangerous jamming and breaking - the weapon firing when the bolt was closed and not waiting for the trigger to be pulled  :bugeye:
 Accuracy International brought manufacture back in house and re-designed the  pin so that it was visible at the rear of the bolt but of course if the right steel had been used it wouldn't have happened anyway .
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The Water Cooler / Re: Mystery Objects
« Last post by awemawson on January 21, 2021, 03:04:48 PM »
OSOEZI merely describes the product "Oh So Easy"

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The Water Cooler / Re: Mystery Objects
« Last post by RussellT on January 21, 2021, 02:46:13 PM »
I should have said that the second one's parts are about 8 inches long, and that the third one is also about 8 inches long.  That seemed to get lost in my struggle to post it.

Andrew, your first suggestion seems very plausible, but what would be sufficiently novel to justify a patent or a name like OSOEZI.

Eric, good thought, but I think it would be too flimsy to stick in a lawn.  I did wonder about a tool for threading something through a tube.

Sea.dog Interesting suggestion, but I'm not sure it's got much of an edge. I'll have to look in the morning.

Russell
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New from Old / Re: Resurrection of a CFEI 100 KVA Induction Furnace
« Last post by hermetic on January 21, 2021, 01:37:39 PM »
Sounds like chinese aluminium! not enough copper for duralumin, nowhere near enough zinc for zamak/mazak type alloy, so it must be  mongrel aluminium! I like the look of that Analoy box of tricks. Clever stuff! How is the water level?
Phil
96
The Water Cooler / Re: Mystery Objects
« Last post by Sea.dog on January 21, 2021, 11:14:38 AM »
Third photo looks like a rabbet plane blade
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Gallery / Re: Milling Machine Stop
« Last post by Brass_Machine on January 21, 2021, 09:39:45 AM »
Very sharp looking!  :bow:
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The Water Cooler / Re: Mystery Objects
« Last post by Brass_Machine on January 21, 2021, 09:34:37 AM »
Picture 2 looks very similar to the stakes that are used for lawn lighting.

Eric
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New from Old / Re: CFEI 100 KVA Induction Furnace - Molten-Metal
« Last post by awemawson on January 21, 2021, 09:32:38 AM »
Every now and again I start up the generator to warm it up and blow the spiders away, and often fire up the furnace for the same reason - but it gets boring just heating a bit of steel to a nice cherry red, and I'm still not equipped to actually decant any into moulding boxes (no boxes made yet and the pump up table that will hold my moulding boxes during a pour currently has a VAST transformer on it that I can't move single handed  :bang:)

Now kicking about at the back of my bench has been the remains of the die cast frame of a Dell Optiplex 'All in One' frame (PC and monitor all held together for desktop convenience - I just wanted the PC sleeve and it's mounting to screw to a wall by my desk!)

So rather than chuck the scrap out it got popped into the crucible during one of those 'spider clearing' sessions this morning. I reasoned that it is either a zinc or aluminium alloy, and if left to cool in the crucible it should shrink enough to shake out - just so long as there is no antimony in it, as that EXPANDS on cooling !

Sure enough hitting it with 30 KW for three minutes produced  one kg of molten mystery alloy and on cooling it was easily removed - so what is the alloy?

This question prompted me to dig out my "Analoy Portable Alloy Identifier" - I'm sure I've shown it here before but probably a few recently joined members won't have seen it. There has an 8085 (I think) embedded microprocessor driving it. Basically you strike an arc between a graphite point and an earth terminal and the device gathers up the emitted spectrum and works out what proportions of what metals  are present. (A predecessor to the XRF analysers of today)

Not surprisingly it turns out to be  85% aluminium, 7.5%  silicon , 1.27% copper,  1% zinc with traces of Magnesium and manganese but what did surprise me was the 3.64% of Iron. I'm not at all sure that that was a deliberate inclusion or maybe something dissolved into the mix during processing.

 . . oh and yes I HAVE ordered a new ribbon for the printer !

100
The Water Cooler / Re: Mystery Objects
« Last post by awemawson on January 21, 2021, 09:12:06 AM »
Photo 1 - Card clips holding a label to fabric

Photo 2 - No real idea - extendable back scratcher ? - Something to unblock a long pipe?

Photo 3 - thin chisels ?
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