On Thu, Jul 23, 2009 at 11:09 PM, Geoffrey  wrote:

> Howdy Meredith lamb,
>
> Neato, 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 get a longer period ?
>
> I guess you need to reduce the mass by the
> mechanical 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.  I first tried a Servalite # 59 (which has
seen a few other mentions on PSN);
but that didn't seem to work very well, on this setup....regardless of
placement.

>
> What kind of washers are those so shiny
> you can see the JVC camera in it ??
> Filing cabinets in the reflection.
>

***Those are the two pivots, that the rolling rod rests on the inside hole
edge.  I think they are actually computer
hard drive disks coated in nickel chrome...but which were rejected for some
reason.  I did make the mistake
of assuming that people already know what they are.  Yes; they do look like
washers.

>
> Range limits are necessary so the device can be
> carried/moved.
>
> Where would the damper go ?
>

***Normally the dampening usually goes near the mass as with most
seismometers.    Their is no dampening
or sensor pickup on the video for the pivot (and quite literally the spring
also) test.  I am definitely not technically
oriented to be up front.  Perhaps the best summation of the test is that
pivot "could" work, and that perhaps also
that the Servalite spring #200 could be of much more major amateur interest
and use in such.

***A note on the spring.  While Ace hardware is where I got the spring from;
Truevalue hardware or other
hardware stores "may" have such.  One would literally have to call their
hardware stores and ask if they have
a Servalite spring assortment.....and....if they have that specific spring.
I think it cost ~ about 3 dollars.  Most
hardware stores are small and they don't have such.  However; they 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 necessary
for proper operation.

Where would a magnetic damper go ?

regards
geoff

***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

>



On Thu, Jul 23, 2009 at 11:09 PM, Geoffrey <gmvoeth@............
> wrote:

Howdy Meredith lamb,

Neat=
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
m=
echanical advantage of the ratio.

=A0
***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 ??
Filing c=
abinets in the reflection.


=A0
***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
carried/moved.

Where would the d=
amper go ?


=A0
***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 
=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.
=A0
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=
y
for proper operation.

Where would a magnetic damper go ?


regards
geoff
=A0
***The steel test base I used would normally be "condemned" =
for the temperature expansion & contraction...but
it was just a readily made test platform.
=A0
Take care, Meredith Lamb