Guys, I am just thinking, perhaps what I am trying to accomplish
(speed change via varidrive), could be best accomplished via an M100
command (shell script). Shell or perl scripts have access to hal,
right? I would write something like (in pseudocode)
$desired_speed = ARGV[0]
$delta = max( 5, $desired_speed/10 )
if spindle-running then
sleep 1 # get it up to speed
else
release-brake
sleep 0.5 # wait for brake
start-spindle
sleep 1 # wait for spindle
fi
my $i = 0
if( $desired_speed <= 0 || $desired_speed > 4200 ) {
ERROR( "BAD DESIRED SPEED";
}
if( $actual_speed < $desired_speed - $delta ) {
start_speed_increase;
} elsif( $actual_speed > $desired_sped + $delta ) {
start_speed_decrease;
} else {
MSG( "You are at a good speed already within tolerance" );
}
$t0 = time;
while( time-$t0 < $max_time
&& !close_enough( $actual_speed, $desired_speed_delta ) ) {
sleep 0.01
}
if( !close_enough( $actual_speed, $desired_speed_delta ) ) {
ERROR( "FAILED TO REACH SPEED" );
}
# Reached speed, success!
And then, I could use the M100 comand top set speed via varidrive, and
the S command to just set the VFD output.
i
On Sun, Aug 8, 2010 at 1:18 PM, Andy Pugh <a...@andypugh.fsnet.co.uk> wrote:
> On 8 August 2010 19:08, Jon Elson <el...@pico-systems.com> wrote:
>
>> There is a spindle-at-speed function that could be used to decide when
>> the speed control logic has finished.
>
> I believe that is an input, used to feed-hold until the drive
> indicates that the spindle is at the correct speed.
>
> --
> atp
>
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