VDI Chart

[Yellow Lab]

Is there a VDI chart that shows what metals fall within certain ranges on the F2 ?

 

[DiGGER27]

Is there a VDI chart that shows what metals fall within certain ranges on the F2 ?

Try these.

The ring pic is mine in air testing.
I also threw in an updated jewelery pic because I found 2 more gold rings after I did this test.

The coins are someone else's, also air testing, but I know that some of the numbers could be different in differnt parts of the country due to soil conditions.

For instance, I usually get quarters in the ground that range from 78-83, usually.
He is missing regular nickels...I usually get between 30 and 33 on my F2 on these in the ground.
34 and up is usually not a nickel, but I have gotten a few higher than 33 and a few lower than 30.

That's why you have to dig it all..

 

[Yellow Lab]

Thanks for posting the pics. they will help. Looks like I should dig everything to be sure and not completely trust the VDI. The VDI readings on the rings is interesting, I won't over look those tabs again.

 

[CarolinaClyde]

n/t

 

[timmysys]

Thank you Digger it was very useful!

 

[Woodstock]

Well here's a factor to consider as well...I was told by a professor years ago that debris ( cut grass, leafs, etc.) builds up at about 1/16" of an inch per year on average. Therefore, one inch every 16 years is an average in most areas that are less traveled, and a tad less hard packed. Sometimes this can be verified by clad being where it is found mostly today seeing that it was introduced in 1965. And it explains how the old stuff gets as deep as it does. The only big problem with is theory is that not all coins what to follow it. But if this is average then it takes 160 years to get 10" down and what is the average depth of a 1850 or 1860 coin? Usually about 10" or better, right? Factors like rain washing off the top debris or hills can make coin's shallower or deeper. And like the "halo" theory, I'm a firm believer in it while others say there isn't any. I know a coin will weep through it's own oxidation and tarnish and that "halo" disappears after the coin is released from it's resting place and then it's impossible to find what residue of the halo, but it doesn't mean a "coin halo" doesn't exist. Moisture increases that "halo" effect as well and that is why deeper coins are found in damp soil and not in dry soil where there is less oxidation and less "halo" effect.
What puzzles me know is that we used to be able to base depth on coils size on average. So a 8" concentric coil will hit a coin sized target at about 8" on the very tip of it's signal cone shape, and a 10" coil would or should get 10" . Now a 5" DD coil supposedly can hit 1-1/2" less that a 11" DD according to some users. This doesn't sound right, shouldn't a 11" DD get at least twice the depth of 5" DD ?
But I have to say that 90% of my deepest finds are made with larger coils and moist or damp soil. Any others feel the same or have an opinion on this?
Happy Hunting to All, Woodstock

 

[Big Boys Hobbies]

Specially when learning a new machine!

 

[Neita SC]

Will these VDIs be comparable for the F5.

 

[DiGGER27]

Will these VDIs be comparable for the F5.

Just found a nice site called coin shooting online
and on it was this chart posted by a member...seems close to the F2 numbers.
The Fisher's have 99 VDI numbers but even though most of them can come up on most units, the F2 skips some.
I paid for 99 but I did not get 99 so I feel a little shortchanged, but the F2 is so sweet I can deal with it.

Fisher F5-- coin VDI number tests
tested an assortment of coins and tested multiples
of each kind of coin

Asst. Buffalo & Jefferson nickels-------------30
Asst. Indian Head cents-------------------58-60
Asst. 10's-30's wheat cents---------------58-62
Asst. later years wheat cents-------------69-71
Clad dimes----------------------------------70
worn silver Barber dimes---------------------70
silver dimes almost uncirculated-------------74-76
clad 25 cents------------------------------80-81
worn silver 25 cents------------------------80-81
silver 25 cents almost uncirculated----------84-86
worn silver 1/2-----------------------------89-90
JFK silver half uncirculated------------------91-92
silver $1-----------------------------------94-95

 

[Neita SC]

Thank you Digger for sharing the info. I have copied it to my F5 notes.