Take a look on Jon Elson's site for the automotive sensor he used for 
spindle encoding and direction. They should certainly work for an index.

Dave
On 11/24/2014 04:02 PM, Leonardo Marsaglia wrote:
> 2014-11-24 20:54 GMT-03:00 andy pugh <[email protected]>:
>
>> The delay is likely to be consistent, so as long as the spindle speed
>> stays the same (and it normally does in threading) then you won't
>> notice.
>>
> That's excellent then. It's going to be for threading but mostly I would
> like to test your method for non circular turning to rough cut some
> camshafts on the lathe.
>
> At least I'm sure the ones with low lift are going to be possible to turn.
> I'm not sure about the ones with 9 mm and more lift, because of tool
> clearance.
>
>


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