DrunkMonk

Good Luck for the future mate. You and the family take care 👍

1 x 88.8g please mate

1 x 1oz please

2 x 1oz Silver please

No problem mate, yes will take the 3 coins and pirate chest please.

If anymore available I will take one mate

One set please.

611 😬

£115.50

I will take 3 if that is ok mate

8 hours ago, SilverStorm said:

Not familiar with the term "PMI testing" until I looked it up.   But I have heard about XRF though (just didn't know it relates to PMI...I do now!)

Two ways to do PMI testing:

1) XRF (equipment too expensive);

2) optical emission spectroscopy (OES), which I am not familiar with at all, but I'm assuming this equipment is going to very expensive as well.

 

 

These types of testing are both very expensive so probably not worth it, a typical PMI set is around 15-20k. 

7 hours ago, SilverStorm said:

Hi DrunkMonk, please see attached pdf file for the specifications.   The standard probe has a measuring range of 1.5 ~ 200 mm (for steel), diameter of Ф8 mm, and frequency of 5M Mz.   Other probe attachments that fit are shown on page 2 of the pdf file (probe technical parameters).

Any insights on proper usage, things to look out for, what to do (or not to do), etc is appreciated, and I thank you in advance for your help in this matter.  

 

  UltrasonicThicknessMeter_TM-8812_TM-8811_TM-8810_Catalog.pdf 973.29 kB · 1 download

Hi Silver storm,

The biggest worry I would have is UT devices are for measuring thickness and not the actual material, you will get differences in velocity depending on the gold / silver grade.  On a standard UT set we adjust the range & time base to allow for changes in velocity, thickness meters don't have this advantage. 

One way around it would be to measure your 250g bar with the calipers, say it's 8mm, set your velocity to silver 3650 M/s and see what reading you get say its 7.5mm, adjust your velocity until your reading on the UT meter says 8mm, your velocity might then be 3675 M/s, that will be the true velocity of your bar. 

Looking at the probes the probe you have should be ok, the better probe would have been the 5Mhz 6mm thin material probe.

1 hour ago, SilverStorm said:

Wow you have experience with UTG?!?  You are a godsend!   😆

I will post up the specs tomorrow for you to look at.  Thanks DM

1 hour ago, SilverStorm said:

Wow you have experience with UTG?!?  You are a godsend!   😆

I will post up the specs tomorrow for you to look at.  Thanks DM!

No problem look forward to it.

 DM is fine. 

10 hours ago, SilverStorm said:

Yes, you indeed need to calibrate the UTG, the calibration cap is mounted to the side of the device.   I forgot to mention I calibrated the UTG before using.  Thanks for pointing that out though.

You are correct, there are a lot of variables to take into consideration.   I'm still learning, and I hope to have more insights I can share with all as I discover what a UTG can or can't do.   My next step will be testing some silver bars that are thicker.  However I am loathed to take the plastic wrapping off the one I have now (St Helena 250 g bars), as I prefer to keep them as mint as possible.   I'll make a decision one way or another soon enough.

I feel your pain unwrapping a silver bar! Most UT gels are water based so not the best applying it to your silver bar.

Do you know what frequency and crystal size the probe is?   

I do Ultrasonic testing on welds and metals, any questions you have just fire them over.  

TBH if I was testing silver or gold I would probably opt for PMI testing (positive material identification) only due to so many variables with UT. 

Thanks BYB, these beauties arrived yesterday. 

Is there no requirement to calibrate your equipment with a calibration block of the same material you are going to test.

Very small changes in velocity will give you false reading. 

There are a lot of variables with Ultrasonic inspection!

28 minutes ago, BackyardBullion said:

Sorry, We have been packaging up all bars today and have allocated numbers now, we could only open this for 24 hours and your package has been wrapped already. 

You were allocated bar number 234

That's fine BYB. 

Can I have 212 please

Waiting list please 😄