Test Nuggets

[Dean Mortimer]

I have lots of tiny pieces. Some the size of the ball in a ball point pen. Not sure if they are exactly 0.0025 could be less.

 

[Hawkear]

If you write 0.0025 as 0.XXXX then
The first X = a tenth of a gram
The second X = a hundredth of a gram
The third X = a thousandth of a gram
The fourth X = a ten thousandth of a gram.
Unless one had expensive electronic scientific grade scales probably costing thousands of dollars, it would be hard to measure anything accurately to the fourth decimal point.
My experience with the cheap electronic scales that claim to measure even to .01 of a gram is that they can't even do that very well as I have a reliable scientific beam balance to check them against.

 

[XLOOX]

If you write 0.0025 as 0.XXXX then
The first X = a tenth of a gram
The second X = a hundredth of a gram
The third X = a thousandth of a gram
The fourth X = a ten thousandth of a gram.
Unless one had expensive electronic scientific grade scales probably costing thousands of dollars, it would be hard to measure anything accurately to the fourth decimal point.
My experience with the cheap electronic scales that claim to measure even to .01 of a gram is that they can't even do that very well as I have a reliable scientific beam balance to check them against.

View attachment 16942

That is a beautiful piece of kit

 

[davsgold]

If you write 0.0025 as 0.XXXX then
The first X = a tenth of a gram ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, which is 10 bits to the gram, yes we find plenty like that with a 6000
The second X = a hundredth of a gram ,,,,,,,,,,,,,,,,,,,,,,,,,,,, which is 100 bits to the gram, good for panning
The third X = a thousandth of a gram ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, which is 1000 bits to the gram, I don't even think that's possible
The fourth X = a ten thousandth of a gram. ,,,,,,,,,,,,,,,,,,, which is 10000 bits to the gram, and thats less than a speck of dust

 

[kiwifred]

the mechanic from Dunolly has put his own vid up this week , you should get all the way to the end of that easy enough .

Can you name the Vid please

 

[Hawkear]

That is a beautiful piece of kit

Thanks and sorry to diverge from the topic somewhat but also have a little beamer. A portable one that I sometimes take with me on trips. It breaks down to store in the box. Once a jeweler who wanted to buy some gold from me seemed to be more interested in buying the scales. You can't be cheated with balance scales if you have your own set of weights.
In the background is a special pick presented to me by some good friends as a wedding gift when Gina and I got married. It has never turned a sod yet and am keeping it that way until I am well down in a hole and confident that a multi ouncer is just a few picks away even if it means going back home to retrieve the pick. I just like savoring moments and good things.

 

[woomera]

Can you name the Vid please

 

[clodmac]

If you write 0.0025 as 0.XXXX then
The first X = a tenth of a gram
The second X = a hundredth of a gram
The third X = a thousandth of a gram
The fourth X = a ten thousandth of a gram.
Unless one had expensive electronic scientific grade scales probably costing thousands of dollars, it would be hard to measure anything accurately to the fourth decimal point.
My experience with the cheap electronic scales that claim to measure even to .01 of a gram is that they can't even do that very well as I have a reliable scientific beam balance to check them against.

View attachment 16942

G'day Geoff
One of the issues with the cheap scales most of us use are is they are probably reasonably accurate once you get over half a gram or so , I suppose the problem with the very light weights under .01 is simply inertia . As I am the inquisitive type do you have weights of .01 gram or less that provide the inertia required to move the beam .
Cheers Clod

 

[clodmac]

Can you name the Vid please

G'day Kiwifred

The one previous to the vid put up by Woomera was the one I was referring to in the post .

Cheers Clod

 

[clodmac]

I have lots of tiny pieces. Some the size of the ball in a ball point pen. Not sure if they are exactly 0.0025 could be less.

G'day Dean

Probably the only way to figure it out with the scales most of us use would be to count out 10 or 20 bits that look to be the same size and weigh the whole lot at once , get the weight and then divide by the number, an average is close enough for the purpose .

Cheers Clod

 

[XLOOX]

G'day Geoff
One of the issues with the cheap scales most of us use are is they are probably reasonably accurate once you get over half a gram or so , I suppose the problem with the very light weights under .01 is simply inertia . As I am the inquisitive type do you have weights of .01 gram or less that provide the inertia required to move the beam .
Cheers Clod

The inertia in question is not in the weight but the balance beam as a function of its mass and quality of its bearing. The best ones, like in my old lab, actually have a mechanism for lowering the test weights onto their side of the pan to eliminate any dropping force affecting the reading. All enclosed in those lovely glass doors to prevent air currents and kept at a constant temp.

And all this discussion is completely off topic. If you want a 0.0025g bit of gold clodmac, the way to make it was given much earlier- weigh a tiny bit, within the capability of your scales, flatten it out as much as you can, work out the area and cut it up.

And it wont make the slightest difference to your testing of sensitivity of an MD whether it is 0.0025g or 0.005g as both weights are beyond anything detectable that matters.

 

[clodmac]

The inertia in question is not in the weight but the balance beam as a function of its mass and quality of its bearing. The best ones, like in my old lab, actually have a mechanism for lowering the test weights onto their side of the pan to eliminate any dropping force affecting the reading. All enclosed in those lovely glass doors to prevent air currents and kept at a constant temp.

And all this discussion is completely off topic. If you want a 0.0025g bit of gold clodmac, the way to make it was given much earlier- weigh a tiny bit, within the capability of your scales, flatten it out as much as you can, work out the area and cut it up.

And it wont make the slightest difference to your testing of sensitivity of an MD whether it is 0.0025g or 0.005g as both weights are beyond anything detectable that matters.

G,day XLOOX

Thanks for explaining the scales and how they work and are operated , I didn't know about the purpose of the cabinet either .

I got a couple of little bits the other day off my mate that as far as my scales will show are around half a grain each
, I will keep one as is and see how much I can divide the other ,

I apologise for not staying on topic the intention was to ask if it was possible in the first instance , which it's not .

Cheers Clod