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-   -   Removing sharp perforation edges on stators with ferric chloride (http://www.diyaudio.com/forums/planars-exotics/104040-removing-sharp-perforation-edges-stators-ferric-chloride.html)

bigwill 23rd June 2007 01:04 PM

Removing sharp perforation edges on stators with ferric chloride
 
I have some stators and I have some high voltage corona proof lacquer. However, the edges of the holes on my stators are too sharp so the lacquer wont stick to them - the most important part. Is it possible to dip the panels in a dilute ferric chloride solution to smooth out the edges?

bigwill 23rd June 2007 01:09 PM

Apprently lye also reacts

bigwill 27th June 2007 07:17 PM

Bump

Few 28th June 2007 04:52 PM

What are your stators made of?

vitalstates 29th June 2007 08:52 AM

Hi Bigwill

Do you have any powder coaters in your area. Last time I checked there were a few cheap ones in Hull, so there might be one closer than you think...that would be my first port of call.

Also...is it the natural edges or burrs that are causing the problem...if it is burrs then I would be tempted to go over the whole side of the stator with a wire brush tool in an electric drill before coating.

Regards

Ed

bear 30th June 2007 01:47 PM

A chemical deburring is superior to any "wire brush" technique, short of a tiny deburring tool used on each and every hole.

The choice of chemical will depend on the metal to be used.

A safe and sure way is to take the stators to a plating shop and tell them that you want them to etch the stators until the sharp edges (which you show them, bring a magnifier) are rounded off. That's fast and effective, safest.

The only other means that would work well is an abrasive deburring, but given that this is a flat sheet with holes, it is difficult to set it up and make it work, unless you do a "sand blast" type of deburring - and you would NOT use sand to to the job. Glass bead in a very very fine grade might be ok. IF you do it at home you must wear a professional grade dust mask, not one of those paper things with the elastic straps. Permanent lung damage can and will result if you breathe the dust.

_-_-bear

bigwill 30th June 2007 03:03 PM

The stators are aluminium

How about countersinking every hole? I'm crazy enough to do this.

bigwill 30th June 2007 06:58 PM

If I had a big enough tray I would attempt a chemical deburring using sodium hydroxide (lye)

bear 2nd July 2007 05:48 PM

you don't need a tray.

but you can make a tray of any size you like with a wood frame and some plastic sheet, the thick stuff they sell at the home improvement/harware stores.

do it outside.

or if ur bold, in ur bathtub - with the plastic.

but, i'd opt to try the spray on "oven cleaner" - it's lye.
you may have to do quite a number of applications to get the desired effect. definitely do that trick outside.

of course, when you build them, you put the burr side away from the diaphragm!

_-_-bear

bigwill 3rd July 2007 10:38 AM

Will lye actually have the desired effect?


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