Hi all,

Actually; I think the cheapest metal magnet holding assembly, particularly
for most of us without the tools
to make metal plates; is to just buy a pair of machinist "1-2-3" (1" x 2" x
3") blocks from like,
Discount machine on E-Bay.  They cost ~$7 for a pair, plus the usual ~$10 >
shipping cost.  Thats 2
blocks for the one price.  The more you buy in one quanity buy session; the
cheaper the total shipping
of course.  Just add the bolts/nuts and/or spacer/standoffs for whatever you
have that would work for
that metal size AND whatever size magnets can fit it also.

They are 1" thick x 2" height x 3" length in dimension.  They have 23 holes
in them; five tapped holes and 18 untapped
holes.  One can easily use 1/4" bolts in the untapped corner holes.  They
are precision ground hardened tool steel.
The thickness will likely absorb most if not all magnetic effect from the
mounted magnets as sensed on the opposite
side/s....after all its 1" thick.

As thick as they are, and with using a solid standoff/spacer, you probably
won't need but 2 of such, instead
of 4 bolts/nuts.

If you need more magnet space (for your seismometer masterpiece/s); one can
add more of the same
side by side (~4 x 6, or 6 x 4") with long enough bolts/nuts to go through
the pair side by side.

The thickness itself makes for a extremely rigid and square overall frame
and one can easily bolt it down
(throught the 1" pre-drilled steel) into your seismometer base plate
vertically or horizontally.

On Ebay search, just enter "123 block", and you'll see them.  Their is a
variety of sellers over time, but
Discount Machine seems the cheapest at the moment.

They are probably all Tawain or China made; but the quality is much more
than good enough for this
purpose.

Meredith Lamb
Hi all,

Actually; I think the cheapest metal magnet holding assembly, particularly for most of us without the tools
to make metal plates; is to just buy a pair of machinist "1-2-3" (1" x 2" x 3") blocks from like, 

Discount machine on E-Bay.  They cost ~$7 for a pair, plus the usual ~$10 > shipping cost.  Thats 2
blocks for the one price.   The more you buy in one quanity buy session; the cheaper the total shipping
of course.  Just add the bolts/nuts and/or spacer/standoffs for whatever you have that would work for

that metal size AND whatever size magnets can fit it also. 

They are 1" thick x 2" height x 3" length in dimension.  They have 23 holes in them; five tapped holes and 18 untapped
holes.  One can easily use 1/4" bolts in the untapped corner holes.  They are precision ground hardened tool steel.

The thickness will likely absorb most if not all magnetic effect from the mounted magnets as sensed on the opposite
side/s....after all its 1" thick.  

As thick as they are, and with using a solid standoff/spacer, you probably won't need but 2 of such, instead

of 4 bolts/nuts.

If you need more magnet space (for your seismometer masterpiece/s); one can add more of the same
side by side (~4 x 6, or 6 x 4") with long enough bolts/nuts to go through the pair side by side. 

 
The thickness itself makes for a extremely rigid and square overall frame and one can easily bolt it down
(throught the 1" pre-drilled steel) into your seismometer base plate vertically or horizontally. 


On Ebay search, just enter "123 block", and you'll see them.  Their is a variety of sellers over time, but
Discount Machine seems the cheapest at the moment.

They are probably all Tawain or China made; but the quality is much more than good enough for this

purpose.
  
Meredith Lamb