hydraulic press and rolling mill

[etack]

you could ask the member that does it elfixx.

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=61&t=11246&p=125757&hilit=+stamp#p125757

Eric

 

[Harold_V]

Harold,

First he has to establish what size coin or bar is talking about. Lots of difference in a one bar and a 10 oz bar in trying to make an ingot.

Seems to me like that's exactly what I said--and that 100 tons isn't enough, especially for five ounces. He commented on anything from one ounce up to ten ounces. Bottom line is, 100 tons will do a job (not great) on a one ounce medallion, and won't be enough for anything larger.

Going to take more heat to get the silver to move around.

Not sure where you're going with this comment. Silver melts at a lower temperature than gold ---and it is not rolled hot. Can you please clarify?

Harold

 

[buckdec]

So what if you have access to a laser printer graphite mills and Cnc machines what would be the best way of getting a silver bar still just melt and pour into a graphite mould?

 

[Harold_V]

You will NEVER achieve a great bar by pouring, assuming you're trying to compare the bar to a die struck bar. That's not to say you can't pour nice looking bars. You can, but it's not easy., especially without expensive equipment.

Pouring to a graphite mold, without atmospheric control, isn't a good idea. The mold burns away constantly, so life is limited. Again, that's not to suggest it doesn't work---it does. Just not a good idea.

There's no real substitute for die struck ingots, although the differences are strictly cosmetic. Don't lose sight of the real purpose in pouring ingots---it's to store and sell metals in a compact and easy to handle form---nothing more. Die struck ingots are sold for profit---not convenience.

Harold

 

[nickvc]

You can produce an exact weight by having shot and filling the graphite mould and melting, the problem is the moulds life is short unless you use a controlled atmosphere, argon I believe.
The finish isn't brilliant but the weight is right.

I still think the best way to get personalised products is to produce a pattern and have them lost wax cast, bear in mind that large plain areas are harder to get a decent finish on so some patterning would make it easier. We had an era of ingots as jewellery so many patterns are still around, unused maybe, but still extant that could be the basis for a personalised product. These bars were anywhere from 1/10 th ounce to 1 ounce mini ingots, they would need finishing but that could be done in-house fairly easily and we all have the means to recover and refine the waste thanks to Hoke..
To make them acceptable worldwide maybe alloy them back down to a karat product or sterling silver and send batches to a UK assay office for hallmarking where you can even register your own mark, proof of the content and a lot cheaper than trying to get individual bars tested and provide certificates for each.
There is a limit to size as large castings tend to be hard to get a decent product but a lot more cost effective than many other methods available.

 

[etack]

So what if you have access to a laser printer graphite mills and Cnc machines what would be the best way of getting a silver bar still just melt and pour into a graphite mould?

You could mill the bars like APMEX
http://www.apmex.com/Product/50645/100_oz_APMEX_Silver_Bar_999_Fine_IRA_Approved_.aspx

All and all unless you get your Ag cheap you will lose money.

whats funny is you will spend thousands of dollars on the equipment to do this when APMEX and NWTmint had their silver for under a dollar over

$0.65 over spot- spot.http://bullion.nwtmint.com/silver_nwtmintbullion.php
$0.99 over spot- http://www.apmex.com/Product/55208/.aspx?utm_source=HomePage&utm_medium=FlashBanner&utm_campaign=041712SSM


Eric

 

[jimdoc]

Just to let everyone know, Northwest Territorial Mint takes months to get your order. They seem to always be a few weeks past the already lengthy expected delivery date. The price is good if you can deal with the wait, but with the way silver prices are, who wants that?

I checked my receipt. I ordered on Sept 23, and was told 8 to 10 weeks. I received the order on Jan 17.
That is a very long time to wait and watch the prices swing up and down the whole time. Especially the down swings.

Jim

 

[etack]

Just to let everyone know, Northwest Territorial Mint takes months to get your order.

yeah I've never ordered from them,and I read that on reviews; however $0.65 over spot with free shipping is a good price if you will wait.

Eric

 

[jrmycooke]

If I may, just out of curiosity, how did the Romans and other eastern countries produce their currency in the middle ages. You can still get a coin from B.C times that still have raised letters. Weights and measures were very important that time.

 

[etack]

With a hammer, stamp, and slave labor. 8)

Eric