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Marko

Sat Oct 13 2007, 12:27PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

3 phase frequency converter?

Chris

Sun Oct 14 2007, 09:27AM

Registered Member #8 Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214

Wow Chris... your crucible? Gas?

Cheap little silica/alumina ceramic crucible surrounded by firebrick, and expensive propylene gas. You're looking at something barely 1 inch in outside diameter.

Anyone want to guess what this is used for?

Power supply or charger for some overly priced government toy? (otherwise surely you could show us the inside).

ragnar

Sun Oct 14 2007, 10:46AM

Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425

Chris wrote ...

Wow Chris... your crucible? Gas?

Cheap little silica/alumina ceramic crucible surrounded by firebrick, and expensive propylene gas. You're looking at something barely 1 inch in outside diameter.

I'm guessing you have a good lens and didn't need to approach the camera so close that its lens would melt from the radiation? :P

So, what're you doing with the silver? **eager, eager**

Steve Conner

Sun Oct 14 2007, 11:14AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Propylene, is that like MAPP gas?

Avalanche, I'm going to guess it's a ground power unit for some large aircraft.

Avalanche

Sun Oct 14 2007, 04:37PM

Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845

Good answers, but none correct!

Note the 'voltage' pot on the control panel - this unit is used an an induction heater, and that pot sets the output power. There is another remote control that plugs into it, for controlling the thing when you are standing by the work coil. A couple of weeks ago we boiled about 200 litres of water in only a few minutes with this thing which was fun, especially when the large iron pipe containing the water boiled over. The bits I didn't show you obviously are the work coil and power factor correction caps

Chris

Sun Oct 14 2007, 07:45PM

Registered Member #8 Joined: Thu Feb 02 2006, 04:34AM
Location: Harlowton, MT, United States
Posts: 214

this unit is used an an induction heater, and that pot sets the output power.

And why would that be so top secret that we cannot see the inside of the enclosure?

I'm guessing you have a good lens and didn't need to approach the camera so close that its lens would melt from the radiation? :P

So, what're you doing with the silver? **eager, eager**

The camera was indeed a few feet away and not directly above the crucible (where exhaust from the flame would melt it). It has a decent zoom which I used but is by no means a top of the line camera. The silver is for chemistry stuff like generating high purity halogens and other gases by photodecomposition of silver salts, where it can be recycled over and over. Also, silver is an indirect form of money that is not subject to inflation :).

Propylene, is that like MAPP gas?

Not really. MAPP gas is a mixture of methylacetylene (C3H4 with a single bond and tripple bond) and propadiene (C3H4 with two double bonds). Its burn characteristics are much like that of acetylene (very sooty if burned rich, but very hot flame, similar odor), and has a lower vapor pressure than propane. Propylene is CH6 with a single bond and a double bond (as the name implies). It has a higher vapor pressure than propane and similar burn characteristics to it, besides being hotter. It is the monomer of polypropylene, and also used to prepare propylene oxide (could this be the true reason I got it?).

Avalanche

Sun Oct 14 2007, 09:13PM

Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845

wrote ...

And why would that be so top secret that we cannot see the inside of the enclosure?

I asked my boss and he said no, simple as that.

I can't remember saying anything about any 'top secret', where did you get that from?

Reaching

Sun Oct 14 2007, 10:18PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

Heres a pic of my new primary i build a few days ago.

Sulaiman

Mon Oct 15 2007, 06:56AM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141

Nice primary,

I hope that bolt at the bottom is stainless steel because if it's normal steel it may get hot enough to melt the plastic.
Or is it wood?

Reaching

Mon Oct 15 2007, 04:50PM

Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458

i wanted to use plastic screws, but then i found the empty bag and had to use normal screws until i get new plastics. iÂ´ll replace the metal screws,. the material i used is so called hdpe, really nice plastic to work with

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