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The Secret Society of Lathe Trolls
A forum devoted to record-cutting deviants, renegades & experimenters
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jessefreelance
Joined: 12 Jul 2005
Posts: 13
Location: vancouver bc
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 Posted: Fri Dec 30, 2005 2:40 am Post subject: rebuilding a crystal cutting head |
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| how is this done????????????? |
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Analogisit
Guest
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| Posted: Fri Dec 30, 2005 3:11 pm Post subject: |
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| A crystal cutting head is essentially a rectangular Rochelle salt crystal that's clamped at one end. As the ac voltage (the audio signal) is applied, the crystal twists, which is translated into movement of the cutting needle. The Rochelle salt absorbs moisture and crumbles over time, so rebuilding it usually involves replacing the crystal (maybe with modern piezoelectric elements) and replacing the soft rubber that supports the needle chuck. After experimenting with an old Astatic head and piezoelectric strips, I gave up and had Gib at West-Tech rebuild one for me a while ago. |
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