PSN-L Email List Message

Subject: Slinky Sensor
From: "tchannel" tchannel@..............
Date: Sat, 16 Jun 2007 15:30:47 -0600


Slinky Sensor                                       June 16, 2007
=20

I just finished a sensor made from a "Slinky Spring" The toy spring kids =
and some adults play with.  I used the "Slinky Jr."  ?   Which is a =
metal spring smaller than the full size Slinky.   I think they call it =
the Jr. and it measures about 1 =BE" in dia.  If you hold the spring by =
the end it expands to about 3'.   When you add weight it expands to =
about 7' and has a period of about 2 seconds.  This is a not-too-serious =
attempt, its just for fun.

=20

The basic concept ;

=20

Use a Slinky spring.  From the end of the spring hang a =BC" x 12" brass =
threaded rod.  On the rod place three =BC" thick x  =BE " od ring =
magnets separated by brass nuts  Two magnets for the coil, one magnet =
lower on the rod for the damper.   Using the 4 brass nuts, you can =
position the magnets up and down the 12" brass rod for vertical =
adjustments.

=20

The rod and magnets pass thru and are centered to float inside a donut =
coil, and a damper made from a 1" x 2" long copper pipe, which is split =
into three parts.  These three parts each have a brass screw for adj how =
close or far they get to the damping magnet.

=20

There are two 3" pvc tees one on top of the other, which act as =
housings. The top tee houses the coil.  The bottom tee houses the =
damper.

=20

The two tees attach to a 3" toilet flange, and the toilet flange is =
bolted to a concrete block.

The concrete block has three adj leveling legs.

=20

The spring, rod, and magnets are all lowered into a 3" x  48" pvc pipe, =
and hang from a 3" pvc end cap.

=20

I plugged the two tee openings with tee plugs with windows.

=20

The entire system is inside the enclosed pvc pipe to isolate from air =
currents.

=20

All in all it work okay, I have recorded several earthquakes with it, =
and it seem to work as well as my other vertical.  They are posted on =
PSN as TCIDzS     (z for vertical S for slinky)

=20

I have a concept sketch and picts to send if anyone is =
interested.........I tried to post on the web. but had problems.



Thanks, Ted







Slinky=20 Sensor           &n= bsp;           &nb= sp;           &nbs= p;  =20 June 16, 2007

 

I just finished a sensor made from a =93Slinky Spring=94 The = toy spring kids=20 and some adults play with.  = I used=20 the =93Slinky Jr.=94  = ?   Which is a metal spring = smaller=20 than the full size Slinky.   I=20 think they call it the Jr. and it measures about 1 =BE=94 in dia.  If you hold the spring by the = end it=20 expands to about 3=92.   = When you=20 add weight it expands to about 7=92 and has a period of about 2 = seconds. =20 This is a not-too-serious attempt, its just for fun.

 

The basic concept ;

 

Use a Slinky spring.  = From=20 the end of the spring hang a =BC=94 x 12=94 brass threaded rod.  On the rod place three =BC=94 = thick x  =BE =93 od ring magnets = separated by brass=20 nuts  Two magnets for the = coil, one=20 magnet lower on the rod for the damper.   Using the 4 brass nuts, = you can=20 position the magnets up and down the 12=94 brass rod for vertical=20 adjustments.

 

The rod and magnets pass thru and are centered to float inside = a donut=20 coil, and a damper made from a 1=94 x 2=94 long copper pipe, which is = split into=20 three parts.  These three = parts each=20 have a brass screw for adj how close or far they get to the damping=20 magnet.

 

There are two 3=94 pvc tees one on top of the other, which act = as housings.=20 The top tee houses the coil.  = The=20 bottom tee houses the damper.

 

The two tees attach to a 3=94 toilet flange, and the toilet = flange is=20 bolted to a concrete block.

The concrete block has three adj leveling legs.

 

The spring, rod, and magnets are all lowered into a 3=94 x  48=94 pvc pipe, and hang from = a 3=94 pvc end=20 cap.

 

I plugged the two tee openings with tee plugs with = windows.

 

The entire system is inside the enclosed pvc pipe to isolate = from air=20 currents.

 

All in all it work okay, I have recorded several earthquakes = with it, and=20 it seem to work as well as my other vertical.  They are posted on PSN as = TCIDzS     (z for = vertical S for=20 slinky)

 

I have a concept sketch and picts to send if = anyone is=20 interested.........I tried to post on the web. but had=20 problems.

 

Thanks,=20 Ted


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