Quote from: forest on June 24, 2008, 10:23:17 AM
Thanks,but I only want it to be my casing. Inside I'd like to place a small bike bell.

I believe the bells should be the same so that the gap between them is constant.
The gap is an important variable.
Paul.

I think if the bells are the same size and shape then the space will not be consistent throughout. If both bells are supposed to be tuned to the same frequency then the inner bell will have to be longer and skinnier to fit inside the outer bell. If they were cone shaped then it would be easier and the gap more consistent but it might effect the harmonics. I will be trying it both ways in about a week.

Quote from: storre on June 24, 2008, 04:45:34 PM
I think if the bells are the same size and shape then the space will not be consistent throughout. If both bells are supposed to be tuned to the same frequency then the inner bell will have to be longer and skinnier to fit inside the outer bell. If they were cone shaped then it would be easier and the gap more consistent but it might effect the harmonics. I will be trying it both ways in about a week.

According to the text we have tuning is for the inner bell only and then the distance from the outer bell. IMO
It makes some sense as the live wire is connected to the inner bell and the outer bell gets neutral connection.
Moreover ,I see no point in having two vibrations at the same time anyway. Just one vibration and a surface at the right
distance that the waves will be hitting and bouncing back.

Quote from: devrimogun on June 25, 2008, 09:15:05 AM
According to the text we have tuning is for the inner bell only and then the distance from the outer bell. IMO
It makes some sense as the live wire is connected to the inner bell and the outer bell gets neutral connection.
Moreover ,I see no point in having two vibrations at the same time anyway. Just one vibration and a surface at the right
distance that the waves will be hitting and bouncing back.

I agree and is how I will make my first tests. This way we can keep the space between the bells a little more consistent.

Does someone know what type of 220v they have in NZ? Where I'm at 220v is not like in the US. My electronic comes off the street pole as 4 wires. 1 neutral and 3 phases that are 126v each. So if I use a dual phase motor for example, each wire is a phase. Same for lighting 220v bulbs. In the US, if I'm not mistaken, it's 220v on one wire and the other is neutral. It seems it would make a difference in the functioning of this heater.

Quote from: storre on June 25, 2008, 09:28:32 AM
Does someone know what type of 220v they have in NZ?

It is 50 hz, according to these people:
http://www.newzealandnz.co.nz/new-zealand/electricity.html
Paul.