Re: [CAD_CAM_EDM_DRO] Re: Make your own linear scales

Something that night be usefull here, are, "multiplier chips". I think Faichild
Semi puts them out. Basically they're log/anti-log amps on a chip, and can do
multiplying, dividing, powers of N, and square root math on linear voltage level
signals.

Bill

On Fri Mar 1 13:42:10 2002, flyspeck1@..., <flyspeck1@...> wrote:

>Thanks "Ballendo" (<chuckle>... I think aliases are kind
>of funny):
>
>I've often thought that the Spheresyn approach was quite
>elegant in its simplicity and ease of manufacture. I've
>always guessed (but never researched) that getting
>precision sized ball bearings would be fairly
>economonical and easy. The only thing I've had as a
>problem is how to make the sin/cos reader head. Using
>LEDs to create an encoder is very simple (in fact, I was
>planning on making a pulse encoder until I found that I
>could buy one for $130.... still might do it for fun
>though). The same concepts apply but now must be
>transferred to analog signals. I believe Hiedenhain
>(probably spelled wrong) use this approach. I've never
>done a search for chips for sin/cos type encoders...
>have you? If you know of any, please let me/us know.
>Clearly the electronics begin to dictate the resolution
>of the scale (assuming hypothetically perfect balls)
>versus the layout of the lines on a disk
>
>--Alan
>
>>Jon,
>>
>>What is your "gut" feeling about a homeshop guy or gal
>>creating glass scales like this? Could we do the
>>etching necessary?
>>
>>What other options do we have for creating our own
>>linear scales? (Besides cable/encoder)
>>
>>I've always thought the "spherosyn" could be "home-shop-
>>able" precision ball bearings in a tube, read
>>capacitively sin/cos)
>>
>>Also have thought about the old "wire" tape
>>recorders... What about recording a sine wave (signal
>>generator created), and reading it with a std. recorder
>> head. Then looking for a way to have TRUE metal tape.
>>Iron oxide?
>>
>>Thank you in advance.
>>
>>Ballendo

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