Re: STG and Parallel Port

["Les Watts" <leswatts-at-alltel.net>]

I am running STG II/EMC but only have the home switch ,amp enable
and fault hooked to its digital i/o. Limit switches run with a separate
control
circuit for safety.
Schematics are on my engineering website.

However I also need information on spindle ,lube,and coolant inputs
for EMC. Searches have given little information but reading source
code comments have given me bit more.

As I am using EMC in production the time has come to make it goof
proof enough for employees to use it. To that end I must:

1) Activate programmable spindle control. Right now the spindle is
manual. Start a program without the spindle on and there will be
a world of grief. Right now commands like M3 in a program cause
a halt so I have to strip them out. It seems like EMC is stopping
and waiting for something... perhaps a lube sense? Anyway I
need to get this to work-if only on/off. So far it looks like no one
is using the stg i/o for this so it must be on a parallel port.
Is it the one I specify in the .ini? Is there a pinout? Is spindle
fwd/reverse etc tied to lube sense? That seems to be the only
input bridgeportio has. I will play around with ioshow and look
at code but if someone would explain further it would help.


2) Spindle force monitoring. I said in the past I wanted to do this
and it looks like the little circuit design works. This calculates
spindle force from servo currents and speeds. It can  distinguish
between inertia, friction, and spring forces. Large currents are
allowed to accelerate things, but e-stop will occur if there is
a large current demand without  the accompanying acceleration.
Scenarios that would cause this might be a broken tool, hitting
a fixture, or a high friction transmission problem. This system
should work faster than a following error abort, and as a separate
system it does not require that EMC is running properly.


Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.alltel.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.alltel.net/~leswatts/shop.html
Surplus cnc for sale:
http://www.alltel.net/~leswatts/forsale.html
----- Original Message -----
From: "William Scalione" <wscalione-at-nc.rr.com>
To: "Multiple recipients of list" <emc-at-nist.gov>
Sent: Monday, November 18, 2002 12:46 AM
Subject: STG and Parallel Port


>
> I have a friend trying to get EMC running with a STG card. So far he has
> bought some boards from US Digital that will input the encoder pulses and
> output a tach signal needed by his amps. This is required because the
> original tach signal was generated by the old controller motherboard. So
far
> that seems to be working ok, so if anyone needs to generate tach signals
> from encoder pulses there's your answer.
>
> Now for the question, Is anyone using the STG I/O for the limits, home,
> coolant etc, or do we still need 2 parallel ports for bridgeportio
>
> Bill
>
>
>