One way to wind with very small wire is to do multiple strands at once. 
Wind the desired number of turns divided by the number of strands. When 
done separate the strands at each end and connect the coils in series to 
get one long coil with the desired number of turns. The bundle is 
stronger and you have fewer turns to wind. The disadvantage is that you 
get more end-to-end winding capacitance, which is not likely a problem 
at seismic signal frequencies.

Another problem with very small wire is that copper tends to dissolve in 
solder. When you touch it with a soldering iron the small wire gets 
significantly thinner and can even disappear. This can be worse with 
lead-free solders and high temperatures. Use Sn63/Pb37 solder and a 
low-temperature iron.

Karl


On 07/21/2010 07:00 PM, Barry Lotz wrote:
> I have wound down to around 40 ga. It it can be frustrating because it takes 
> very tension to break. I have opted to wire in the 30's and used more turns and 
> closer spacer magnets.  What I did was take the source coil and put a piece of 
> material thru the center like a pencil. I clamp the pencil horizontal using one 
> of those handsfree holders which has two alligator clips which I grap the pencil 
> ends with. I put this assembly on the floor and hold the wire lightly with my 
> fingers near table height. I think it gave me a little more slack if something 
> happens during the winding. I only use this proceedure when I'm using a variable 
> speed drill. I use clear nail polish because it already has a brush and it has a 
> fairly low viscosity. I like the Idea of stopping every so often and putting a 
> light coat on the top surface of the coil. OK this the part where others 
> probable will disagree. If the wire breaks, depending on the situation, I tin 
> both ends with the soldering iron and attach them together and continue. The 
> splice should be short and I havent had two breaks close enough together to 
> cause a short. It does leave a slight bump in the coil because the splice is of 
> larger diameter as will be pretty much straight. If I need to know the coil 
> resistance during the process, I expose the wire near where I stopped with the 
> soldering iron and measure it's resistance to the starting end of the 
> coilRegards
> Barry
> http://www.seismicvault.com 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)