On 10/27/2009 03:27 PM, Chris Radek wrote:
> On Tue, Oct 27, 2009 at 02:54:53PM -0500, Mark Cason wrote:
>
>
>> OK, here come stupid question of the day...
>>
>> Why does it matter if the encoder tells the computer which direction
>> the spindle is turning?? Or is this just a side effect of quadrature.
>>
> 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?
If the spindle is under manual control, then the operator should set
the spindle direction based on whichever direction is required by the job.
The only reason I can see for having the encoder telling the computer
it's direction, is so that some sort of error can be set, if the
direction is not consistent with the direction set in the gcode
(hardware/operator/gcode fault). Can this be done in HAL?, or am I
making a mountain out of a mole hill again.
I'm not trying to start a argument, I'm just curious. My machines
are in various stages of being partially-built, and I'm just trying to
make my machines as safe, and idiot proof as possible.
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