PSN-L Email List Message

Subject: Re: Opinion on seismometer
From: Mark Robinson mark.robinson@...............
Date: Thu, 14 Jun 2007 01:48:30 +1200

Jón Frímann wrote:
> I have replaced the wire, the one I was using was just a bad wire. The
> arm has mass, just not big one. The mass is something around 50g at the
> moment. I am going to try to increase the mass today to 1kg.

Hi Jón,

The vertical mast looks a bit dodgy.

I expect it will wobble about when you add mass.

Using a longer lump of the square tube for the mast and should resolve that issue.

Tacking some pieces of square section along the base should also improve 
rigidity there although I can't tell how thick the base is so it may be fine.

Your sensor arrangement doesn't look quite right, especially in the photo of 
your first mockup.

Perhaps you could make a pair of pole pieces to attach to the magnet: one a 
ring to fit over the outside of the coil attached to one pole and the other a 
rod sized to fit through the coil.

That should give you good output.

You have some good parties over there ;)
Mark Robinson


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