"Nick Müller" wrote in message
...
Ed Huntress wrote:

Go to Google and look up Terfenol-D.

That was it. Got enough stuff to read now.
And found 2 or 3 articles about EFI with Terfenol.

Aha! Well, it's a very logical application. I'm not surprised that someone
has been working on it.


When I was at Wasino, we, in cooperation with Etrema, who were the
material experts, were developing it for elliptical piston-turning.

Is Terfenol machineable (without having an EDM), and how? Couldn't find
anything.

I forget. I think I used to know, but I forget that, too. g It's been a
few years.

Now that you're on the trail, I'm sure you'll be able to get answers. The
Etrema people are very knowledgeable and I always found them forthcoming
when I talked with them.


Very interesting that material, thanks again!

You're welcome. It will be fun to experiment with it if you get your hands
on some. Making it work is very easy. Making it position a tool to +/- 1
micrometer through its full stroke, on a lathe turning at 4,000 rpm, is not
so easy. That's where the hysteresis becomes challenging.

However, I'm guessing that, for injection, all you'll have to do is add a
compensating factor to the solenoid current as the rpm increases. That could
be a simple circuit.

Maybe. I hope. g In its favor, it's much more durable than a stacked piezo
array, in addition to producing more force, and it apparently doesn't
fatigue in service.

--
Ed Huntress