On Thu, Jul 23, 2009 at 11:09 PM, Geoffrey <gmvoeth@............
Howdy Meredith lamb,
o, Would it be possible to change the ratio
of the pivot point to 18 to =
25 centimeters on the weight side
and one centimeter on the spring side and greatly reducing
the mass to g=
et a longer period ?
I guess you need to reduce the mass by the
echanical advantage of the ratio.
***Geoffrey; a lot of the "trials" of this design literally =
depends on the specific spring itself and its placement both
on the end of the boom and where it is connected....which "could =
be" both behind the pivot point or in
front of the pivot near the mass.=A0 I first tried a Servalite # 59 (w=
hich has seen a few other mentions on PSN);
but that didn't seem to work very well, on this setup....regardles=
s of placement.=A0
What kind of wa=
shers are those so shiny
you can see the JVC camera in it ??
abinets in the reflection.
***Those=A0are the two pivots, that the rolling rod rests on the insid=
e hole edge.=A0 I think they are actually computer
hard drive disks coated in nickel chrome...but which were rejected for=
some reason.=A0 I did make the mistake
of assuming that people already know what they are.=A0 Yes; they do lo=
ok like washers.
Range limits ar=
e necessary so the device can be
Where would the d=
amper go ?
***Normally the dampening usually goes near the mass as with most seis=
mometers.=A0 =A0=A0Their is no dampening
or sensor pickup on the video for the pivot (and quite literally the s=
pring also) test.=A0 I am definitely not technically
oriented to be up front.=A0 Perhaps the best summation of the test is =
that pivot "could" work, and that=A0perhaps also
that the Servalite spring #200 could be of much more major amateur int=
erest and use in such.=A0
***A note on the spring.=A0 While Ace hardware is where I got the spri=
ng from; Truevalue hardware or other
hardware stores "may" have such.=A0 One would literally have=
to call their hardware stores and ask if they have
a Servalite spring assortment.....and....if they have that specific sp=
ring.=A0 I think it cost ~ about 3 dollars.=A0 Most
hardware stores are small and they don't have such.=A0 However; th=
ey may be able to special order such, likely
at a higher cost.
It would be nice to have two such devices
in opposite directions to=
cancel out tilt
in a diff amp.
Two such matched devices are necessar=
for proper operation.
Where would a magnetic damper go ?
***The steel test base I used would normally be "condemned" =
for the temperature expansion & contraction...but
it was just a readily made test platform.
Take care, Meredith Lamb