Reloading scale trouble -problem solved

[TimRB]

Are both magnets securely mounted?

I don't know how the damping magnet or magnets are attached to these scales, but even if they were loose, the beam would settle to zero as long as the magnet was stationary at the time. The damping relies on relative motion between the conductor and the field.

Parker has already ruled out a piece of metal attached to the magnet scraping against the damping paddle. Since the problem went away when he removed the beam and then replaced it, I suspect it had been sitting on its seats slightly cocked or maybe there was a piece of schmutz that came out and fell off when the beam was removed. As has been noted, there's really not much that can go wrong with one of these things except the pivot.

Tim

[fguffey]

Anything is possible in the world of reloading; we have reloaders that can move the shoulder back on a case when sizing the case with a die that has case body support. and then there are those reloaders that are really good at it; they can bump the shoulder back an incredible .002".

And we have the neck tensioners, they do not have bullet hold. All they can manage is tensions, not in ounces, pounds or tons, just tensions.

I do not have part time magnets; my magnets are magnets all the time. I have magnet machines, I have machines that create magnetic field, when it comes to teaching electricity the machines that created a magnetic field through wire windings and metal cores are my favorite.

F. Guffey

[Parker2020]

OK here is a link to some info I found that shows the damping magnets flux as configured .

The middle example shows how the Ohaus damping magnets are configured /mounted .
Note there is a "Neutral" (null ) position in the center of the magnet(s) that corresponds with the "0" line of the scale .

If the beam pointer rises above "0" line currents are induced into the copper plate pushing the beam back down towards "0" . When the pointer swings below the "0" line currents flowing the opposite direction are induced into the copper plate causing the beam to lift back towards "0" .

I verified with a compass the magnets in my scale are in fact N-S on one end and S-N on the opposite end (clink link below for illustrations)



Now look at the 3rd example on the right . Both magnets are oriented with a
N-N and S-S pole at each end .

With this configuration the are now 2) Null Points ( 1 above the "0" and 1 below the "0" line . This is the behavior my scale's beam was exhibiting . You could physically position the beam pointer on the "0" line when balanced (and it would stay )but if it swung either direction hi or low it would stick in one of these 2 positions dependent on the direction of beam travel .

I did a little experiment with a couple of bar magnets . I positioned the magnets N-S and S-N with a gap in between them just like the scale magnets . I could read all four magnet poles with a compass . N, S top and S,N bottom

Next I put a steel bar between poles at one end of the parallel magnets .
Now I only read a single "North" pole at one end of the magnets and a single "South" pole at the other end (where the bar was attached .

As I explained in my earlier post above I found a semi- magnetic stainless U clamp help in place touching the the bottom of both scale damping magnets with a very magnetic screw . It seems very likely to me that this clamp /screw combo could act as magnetic bar across the bottom end of the damping magnets altering the magnetic flux of the magnets and this would explain how my scale was acting .

The popular wisdom here seems to be that I must have failed to notice dirty knife edges /V-blocks , Beam misalignment , or dragging somewhere between the scale base and beam . I have been using this scale for over 20 years for loading thousands of rounds and already experienced all of these issues mentioned and know how to correct them when they happen .
This was different...

[TimRB]

This was different...

Fair enough, but you have a fundamental misunderstanding of how the system works. The beam/paddle/magnet system is not trying to settle the beam at some magnetic "zero". The only thing the magnets are trying to do is stop the beam (paddle) from moving. The field present through the paddle when this happens is immaterial. This is a Faraday's law thing:

http://info.ee.surrey.ac.uk/Workshop/advice/coils/Faraday/index.html

Tim

[M1NM]

I never trusted the magnetic ones. I have an old Pacific that uses oil - https://firstpatriotpress.blogspot.c...-oil-bath.html