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Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I'll try to get straight to the point... I have a few discrete hall effect sensors, and I want to turn them into hall effect current transducers. A quick look at commerial HEDs reveals that they consist of a soft ferrite ring with a slot cut through the ring to form an air gap, and the hall effect sensor is mounted in the slot. I was wondering, would it be possible to take an ordinary ferrite ring and machine the slot into it? I have access to a small lathe which can be set up for milling. Has anyone here tried machining ferrite, and would it be worth a try or would I be wasting my time?
Second approach - failing that, I could probably grind up some ferrite cores and mix the power with resin, and cast the rings. I have used this 'ferrite and resin' method before to fill air gaps in transformer cores with some sucess, but I'm thinking the leakage would be too much if the whole thing were cast.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Ferrite can be machined to some extent, but any processes really have to be abrasion or "grinding" rather than typical machining processes.
IMHO, I wouldn't let your standard cutters or your expensive mill bits get anywhere near the ferrite.
To cut a slot in, you may be able to use an oscillating abrasive cutoff disc (imagine similar to the type used in hospital to cut casts off limbs without ripping into the skin).
Failing that, which you probably don't have access to -- a diamond-impregnated wheel (a. la thin angle-grinder wheel) may be able to go through.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I would use a diamond impregnated cutoff wheel and with plenty of water. I would cut with a slow speed because the ferrite is brittle. If I had to I would mount the ferrite somehow on my xy table and use the slow spindle speed on my drill press while feeding it in. Then I would keep it wet with the squirt bottle while feeding the ferrite into the cutter.
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Machining Ferrite
