In a message dated 04/02/2009, rog@.......... writes:
8020 is 6061-T6 aluminum in an extruded erector-set like form that seems to
be a standard. This type of extruded aluminum seems optimal for stiff
seismometer like structures. It is easy to configure and quite inexpensive as
well.
_http://www.automation4less.com/store/categories.asp?cat=1116_
(http://www.automation4less.com/store/categories.asp?cat=1116)
I am curious if others have used 8020 in seismometer designs.
Hi Robert,
You would need to use the larger sections, but they may be relatively
expensive. You need HT30 triangular plates at the corners to make the structure
rigid enough. Aluminum is ~3x as flexible as steel. The EQ1 used 1.5" square
from memory.
I prefer standard U channel, 3" x 1" x 1/8" for a Lehmanm and 2" x 1" x
1/8" for an AS1 type vertical. These work fine. The corner plates are cut
from 5" squares. I put the open U on the inside of the L frame.
I use Stainless Steel nuts bolts and washers. If you put mild steel or
brass in contact with Aluminum, it corrodes very rapidly.
I suggest that you cross check the material prices and let us know?
Regards,
Chris Chapman
In a message dated 04/02/2009, rog@.......... writes:
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6061-T6 aluminum in an extruded erector-set like form that seems to be a=20
standard. This type of extruded aluminum seems optimal for stiff=20
seismometer like structures. It is easy to configure and quite=20
inexpensive as well.
ht=
tp://www.automation4less.com/store/categories.asp?cat=3D1116=20
I am curious if others have used 8020 in seismometer=20
designs.
Hi Robert,
You would need to use the larger sections, but=20=
they=20
may be relatively expensive. You need HT30 triangular plates at the corners=20=
to=20
make the structure rigid enough. Aluminum is ~3x as flexible as steel. The E=
Q1=20
used 1.5" square from memory.
I prefer standard U channel, 3" x 1" x 1/8" for=
a=20
Lehmanm and 2" x 1" x 1/8" for an AS1 type vertical. These work fine.=20=
The=20
corner plates are cut from 5" squares. I put the open U on the inside of the=
L=20
frame.
I use Stainless Steel nuts bolts and washers. I=
f=20
you put mild steel or brass in contact with Aluminum, it corrodes very=20
rapidly.
I suggest that you cross check the material pri=
ces=20
and let us know?
Regards,
Chris Chapman