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LF: Cutting toroids

To: <[email protected]>
Subject: LF: Cutting toroids
From: "Peter Martinez" <[email protected]>
Date: Tue, 18 Jul 2006 06:27:45 -0000
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From G3PLX:

J:

If the toroid in question is ferrite, i.e. a ceramic material, then forget about cutting it, especially if you want to be able to put the two halves back together again and still have a good magnetic path. The only way is to crack it, which you can usually do in a vice, with a steel rod (a nail) across the middle of one side and two bits of wood suporting the edges of the other side. If you need the two halves to be precise, you can score along the intended break-line with a diamond or tungsten scribe like you do before cracking ceramic tiles in the same way.The cracked surfaces will not be flat but will mate perfectly. You can then do your winding or threading on the separate halves and either clamp or glue them back together and get back to a pretty good magnetic circuit.

Iron dust toroids are made from an epoxy loaded with particles, and can be cut easily, but they won't crack cleanly like the ferrite ones.

73
Peter



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