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Author Topic: Your latest purchase  (Read 77898 times)
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Pittsburgh, PA, USA
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I made my first electric motor out of a hank of that stuff cut off in new construction. That was 1970 or 71. Didn't have heat shrink, just electric tape. It was a bit bulky but it spun.

This stuff is 3-phase power line. But if I can remember to ask the scrappers to look for phone line bundles, I will.

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For the first time I wanted a slide pot for a project and didn't have them.  Have all sorts of pots, but they are not convenient as a UI control, more of an adjust and forget control.  They ended up being cheaper than I expected.  Got real nice ones for about 70 cents each.  VERY NICE quality, actually.  10K, one is linear, the other is log.

http://www.newark.com/bourns/pta6043-2010cib103/potentiometer-slide-10kohm-250mw/dp/43K0706?Ntt=PTA6043-2010CIB103
http://www.newark.com/bourns/pta4543-2015dpa103/potentiometer-slide-10kohm-125mw/dp/05R8044?Ntt=PTA4543-2015DPA103



Also got some mercury switches from a Chinese vendor.



* SliderPot.jpg (287.17 KB, 1200x858 - viewed 127 times.)

* MercurySwitches.jpg (109.61 KB, 600x946 - viewed 186 times.)
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Vexatious Sampler

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I don't think you connected the grounds, Dave.
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Is it even legal to send mercury through the post?
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Ayer, Massachusetts, USA
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Hmmm, this thread is still going on.  I was trolling through etsy a few days ago, when I saw an Australian selling wooden momentary contact buttons, and I thought cool.  So I just ordered it, but I haven't gotten it yet.  I ordered 6 buttons, and the price with upgraded shipping was about $35 US.  http://www.etsy.com/listing/160141860/qty-6-custom-order-michael-meissner?ref=col_view
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Is it even legal to send mercury through the post?

I started a thread about that subject in General Electronics when I ordered these.  There are several international and domestic sellers of these switches on eBay.  No one seems to be getting busted.  The consensus is that it is legal but you have to declare it as hazardous, which was not done in this case.  Even very reactive chemicals can be shipped if they are declared and the hazardous shipment is paid for, check what this guy wants to ship alkali metals:

http://elementsales.com/pl_element.htm#rb
Policy:  http://www.elementsales.com/hazmatshipping.htm

I have gotten metallic sodium from eBay vendors for far less than him.  I don't think everyone declares hazardous materials properly.  This guy has reasonable shipping:

http://www.ebay.com/itm/Sodium-Metal-Element-Sample-1oz-Ingot-In-Sealed-Foil-Pack-99-8-Pure-/221260753471

I got a chunk of about a pound or 500 grams for this price years ago.  
« Last Edit: August 23, 2013, 12:48:33 pm by JoeN » Logged

Vexatious Sampler

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Is it even legal to send mercury through the post?

In the U.S., no...

http://about.usps.com/posters/pos138/pos138_hazard_009.htm

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Mercury, mercury-containing items (thermometer, etc.) ... Mercury and items containing mercury are always prohibited.
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Is it even legal to send mercury through the post?

In the U.S., no...

http://about.usps.com/posters/pos138/pos138_hazard_009.htm

Quote
Mercury, mercury-containing items (thermometer, etc.) ... Mercury and items containing mercury are always prohibited.

Just to be clear, it can be sent by UPS and FedEx, they just charge through the nose for the hazardous materials tag.

This memo makes it extraordinarily clear that the shipment I received was actually illegal.  It came China Post / USPS.  Thank you.

When I read the original question I read "the post" as being any major delivery service.  Reading it as the USPS only (when in the United States) is probably the more proper way to read that word.
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Vexatious Sampler

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I have gotten metallic sodium from eBay vendors for far less than him.  I don't think everyone declares hazardous materials properly.  This guy has reasonable shipping:

http://www.ebay.com/itm/Sodium-Metal-Element-Sample-1oz-Ingot-In-Sealed-Foil-Pack-99-8-Pure-/221260753471

I got a chunk of about a pound or 500 grams for this price years ago.  
I read the listing, and I saw the line, great for the collector or lab.  Lab I can understand, and I would expect to be them to be the primary buyers of Sodium.  Assuming I remember what sodium does from high school chemistry, I can people wanting to see what kind of trouble they can get into with reactive metals.  Chemistry teachers I can see.  I just didn't think that there were people who collected each of the elements, and didn't actually intend to use them.  Must be interesting by the time you get to the transuranic elements.
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Pittsburgh, PA, USA
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There is at least one reactor that uses molten sodium as the fluid in the heat exchanger. That's a LOT of sodium BTW.

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There is at least one reactor that uses molten sodium as the fluid in the heat exchanger. That's a LOT of sodium BTW.



It will be a bad day when a new reactor operator tries to top the reactor off with water.   smiley-yell
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Vexatious Sampler

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The sodium is inside sealed pipes. IIRC the reactor is or was at CERN. They're smart people, not like the cost-cutting for profit and fix-later-forever job security GE management and engineers that built nuke plants in east central USA.
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Must be interesting by the time you get to the transuranic elements.
Just hope the delivery time is shorter than the half-life!
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Must be interesting by the time you get to the transuranic elements.
Just hope the delivery time is shorter than the half-life!

Yeah, the last time I ordered a gram of astatine the guy swore it was there when he mailed it.  I guess he had a point. smiley-sad
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Vexatious Sampler

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Must be interesting by the time you get to the transuranic elements.
Just hope the delivery time is shorter than the half-life!

Yeah, the last time I ordered a gram of astatine the guy swore it was there when he mailed it.  I guess he had a point. smiley-sad

It'd make a great base for a "holistic medicine" being self-diluting as it is. That stuff would get more "valuable" with time.
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Latest purchase:

Mega 2560 (chinese clone)
W5100 Ethernet shield
2 x Dual H Bridge motor driver boards
50 x RGB common anode LEDs
20 x Infrared universal receivers

All for different projects, though I'll have a go at putting them all in a project together
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