Re: STG and Parallel Port

[Jon Elson <elson-at-pico-systems.com>]

Les Watts wrote:

>I did try using the s word along with an M3.... program execution stops.
>
>I think the problem might be that I am using bridgeporttask as the task
>controller
>and minimillio as the io controller.
>  
>
AWWK!  You are not supposed to do this, as there are different messages 
supported by the
two different versions.  Nou need to keep these matched for best operation.

>I will just have to play around with it and see what I can get on a parallel
>port.
>
>If the latest cvs handbook has something about this I can't see it just yet.
>I don't see anything about it on the html handbook on the site.
>I am on a windows box here in the office and would have to play around a bit
>to be able to download cvs. If this stuff is not documented well I will take
>notes,
>write up what I find, and post it.
>
>I would expect a spindle control to check for actual spindle rotation rather
>than just a blind command. I can put an inductive sensor or hall effect
>device
>(magnetically biased) near the hex collet nut on the spindle to create a
>quick and
>dirty tach. I can clean this signal up and convert to a digital pulse rate
>or analog
>voltage porportional to rpm with a few spare components from the electronics
>parts bins. At minimum I just want a digital signal to indicate that the
>spindle
>is in fact turning when activated, although a speed feedback signal is
>almost
>as easy if EMC can now handle it.
>
Well, I don't think EMC really has anything like this at present.  What 
you could do is connect the
spindle run signal to a delay, and then AND the rotation NOT present 
signal with the delayed spindle run
signal, and if they are both true (spindle has beet told to run a while 
ago AND spindle is NOT running)
then command an E-stop.  This could be done with a simple 555 timer 
chip, an and gate and a 5V
micro relay in the estop chain.

Jon