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Interious 7th January 2006 01:47 AM

Wire stator gluing method
 
2 Attachment(s)
Perhaps this will be of interest. I use a 2 hour epoxy applied with a rubber ink roller. This produces a very uniform result. Not as strong as I would like, but adequate.

mwmkravchenko 7th January 2006 02:07 AM

Sweet!
 
Very nice work indeed.

Mark

Interious 7th January 2006 03:03 AM

2 Attachment(s)
Thanks Mark. A few more images.
Dave

Interious 7th January 2006 03:10 AM

2 Attachment(s)
Same method, but using PVC insulated wire. A jig was used to apply tension to each wire loop, individually.

I_Forgot 7th January 2006 03:15 AM

May we have a photo of the jig?

Thanks,

I_F

Interious 7th January 2006 03:32 AM

About a year ago, thinking I would never again wind wire stators, I stupidly took it apart. Destroyed it.

The wire was spaced with threaded rod, but wound on top of wax paper covered plate glass. The critical end was a series of hooks and rubber bands attached to a board which in turn could be retracted for additional tension. Each loop had its own hook and rubber band--a plethora.
1.5" particle board served as the base.

I originally tried tensioning the wire without the bands and hooks, but found that the magnet wire would stretch excessively, producing wildly varying tension and thus uneven spacing along the wire length. The rubber bands compensated for this.

I coated the acrylic louver with epoxy, turned it upside down, placed it on the wire and weighted it with another piece of glass, foam, mdf, and about 100 lbs of sand bags.

I'm thinking about trying this again because I like the sound of wire stators, but want to develop a method and jig that is not as complex.
The stator in the photos were made about 10 years ago.

I may have a hard copy picture, come to think of it. I'll look tomorrow.
Dave

Bazukaz 7th January 2006 07:44 AM

I think square cubes of plastic grid should cause resonances , should't they ?

SY 7th January 2006 11:43 AM

Yes they can, but at ridiculously high frequencies.

I saw an article some years back where the builder tensioned the wires by bowing the plastic eggcrate, gluing the wires at the ends, then unbowing. I've been wanting to build more wire stators (the ones I have are salvaged from some Acoustats) and am very tempted to try that scheme.

Interious 7th January 2006 02:13 PM

Quote:

Originally posted by SY
Yes they can, but at ridiculously high frequencies.

I saw an article some years back where the builder tensioned the wires by bowing the plastic eggcrate, gluing the wires at the ends, then unbowing. I've been wanting to build more wire stators (the ones I have are salvaged from some Acoustats) and am very tempted to try that scheme.

That article was in Speaker Builder. The eggcrate had holes drilled in the ends through which the wire was weaved. The crate was then unbowed, tensioning the wire. He then used a syringe to apply an epoxy fillet to each wire/crate point of contact. His wire spacing was quite wide, if I recall, perhaps 6/inch; but the method is elegant and I'm sure works fine.

I searched for a picture of my jig, but no joy. I can't imagine that anyone would want to reproduce it, but I regret failing to photograph it.

I primarily wanted to share the method of glue application, which works very well if the fabrication method employed requires applying glue to the entire crate surface before mating the crate to the wire on a corresponding jig.
Dave

Bazukaz 7th January 2006 02:40 PM

I don't know cube sizes that are in pictures , but i think that first resonant frequency is calculated by f = 330/(2*l) , where l - cube width/height , or deph.
So , if we have cubes of, say , width = 2 cm , f = 330/(2*0.02) = 8250 Hz.
Not so high ! i was experimenting with plastic grid of such sized cubes , it changes sound noticeably.

Are my formulas correct ?

Lukas


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