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 Post subject: Mica Diaphragm Assistance
PostPosted: Sat Oct 10, 2020 7:54 am 
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Victor II
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The Phonograph Stop
Joined: Thu Aug 24, 2017 6:59 pm
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Location: Southern New Jersey
I recently acquired some odd sized mica diaphragms. Is there a way to cut to size? If so what is the process without damaging the edges?

Thanks everyone!


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I have not failed. I've just found 10,000 ways that won't work.
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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Mon Oct 12, 2020 2:29 pm 
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Victor II
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The Phonograph Stop
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Location: Southern New Jersey
Anyone??
I have not failed. I've just found 10,000 ways that won't work.
Thomas A. Edison


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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Mon Oct 12, 2020 2:55 pm 
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Victor V
Joined: Mon May 13, 2013 2:04 pm
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it's very difficult as mica is very hard in the flat plane but cleaves easily in the horizontal plane , but you can try using a compass ( Drawing tool ) by placing a steel needle in the "drawing" side and going round and round till you go through the entire mica it does work and the mica is OK to use even if the edge isn't perfect


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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Mon Oct 12, 2020 3:35 pm 
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Victor II
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The Phonograph Stop
Joined: Thu Aug 24, 2017 6:59 pm
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Location: Southern New Jersey
soundgen wrote:
it's very difficult as mica is very hard in the flat plane but cleaves easily in the horizontal plane , but you can try using a compass ( Drawing tool ) by placing a steel needle in the "drawing" side and going round and round till you go through the entire mica it does work and the mica is OK to use even if the edge isn't perfect

Thanks for the info!!
I have not failed. I've just found 10,000 ways that won't work.
Thomas A. Edison


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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Tue Oct 13, 2020 8:21 am 
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Victor IV
Joined: Sun Mar 15, 2009 6:18 am
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Location: Luxembourg
Soundgen's note reminded me that you can buy compasses fitted with blades. I have one I bought decades ago, it is Japanese and I used it to cut paper circles. The blade is replaceable and of high quality, so I would think it will be effective to cut mica, but I never tried to do so. You can find these if you look for origami tools.


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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Tue Oct 13, 2020 10:41 am 
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Victor V
Joined: Mon May 13, 2013 2:04 pm
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CarlosV wrote:
Soundgen's note reminded me that you can buy compasses fitted with blades. I have one I bought decades ago, it is Japanese and I used it to cut paper circles. The blade is replaceable and of high quality, so I would think it will be effective to cut mica, but I never tried to do so. You can find these if you look for origami tools.


like this I guess , be great to know if it works on mica

https://www.graphicsdirect.co.uk/produc ... gI6uPD_BwE


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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Tue Oct 13, 2020 3:21 pm 
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Victor III
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Keep'em well oiled
Joined: Mon Dec 18, 2017 2:51 am
Posts: 991
Location: Madrid, Spain
Oooops, reiterated!
Inigo


Last edited by Inigo on Wed Oct 14, 2020 9:53 am, edited 1 time in total.

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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Tue Oct 13, 2020 3:21 pm 
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Victor III
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Keep'em well oiled
Joined: Mon Dec 18, 2017 2:51 am
Posts: 991
Location: Madrid, Spain
Mmm i don't like mica diaphragms with peeled borders... i like'em with perfect borders...
I thinnnnk they must clinnnnk clear as a bell when dropped on a hard surface by the edge, just 1" fall on the table from your fingertips... That reveals the sound it will have when reproducing. The higher and cleaner the clinnnnk , the better it will sound.
You can call me maniac! :D
Inigo


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 Post subject: Re: Mica Diaphragm Assistance
PostPosted: Tue Oct 13, 2020 11:04 pm 
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Victor Monarch
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Needle Tins are Addictive
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If you can find a compass similar to the one pictured by Soundgen, you can place an Exacto knife in it instead of a pen or pencil, which will definitely cut mica. Also, if you place the mica on a flat surface with a piece of double sided tape below, it will keep it from spinning when cutting. Covering the edges with Scotch tape before cutting may stop the edges from fraying during cutting. Some people have also used a compass to draw a new cutting line and then cut it with very sharp scissors and it supposedly works fine.
"The phonograph† is not of any commercial value."
Thomas Alva Edison - Comment to his assistant, Samuel Insull.

"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
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