AH, now I understand. Thanks guys!
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On 10/27/2009 05:14 PM, Andy Pugh wrote:
> 2009/10/27 Mark Cason<[email protected]>:
>
>
>>> For lathe threading you don't need to know it. For tapping you
>>> do.
>>>
>>>
>> That part I understand, but, if a spindle is under computer control,
>> then the computer should already know which direction the spindle is
>> turning, right?
>>
> It knows that it has asked the spindle to reverse, but not that it has yet..
>
> The application is rigid tapping (with a tap in the milling spinfle).
> The spindle descends at 1 pitch per rev, then reverses and winds back
> out again. At the point where it stops then reverses the controller
> needs to be able to know for sure which way the spindle is turning.
>
>
>
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