Re: Jog wheel

["William Scalione" <wscalione-at-nc.rr.com>]

>
> This behavior could be altered if we wrote a routine that captured the
pulses
> of the handwheel and add them up while a jog command is being executed.
Then
> when the current motion command completes, it would issue a single command
> with the distance value as the number of pulses times the increment and
set
> the count to zero again.
>
Ray,

 If i know I need to move .005" and my multiplier is set to .001", I
need to move the wheel 5 clicks, but if I just need to move the axis about
12" or so I want to start spinning the wheel fast and slow down as I near
the
12" point. The axis will move fast when I'm spinning it fast and move slow
when I'm spinning it slow. But most of all I want it to stop moving when I
stop spinning.  Kind of a continious move as long as the wheel is spinning
with the axis speed tied to the rate of the incomming pulses.

Perhaps a DRO board could be used to count up the pulses. Poll it every
10 msec or so, seems it would be easier than trying to catch every pulse
that hits the parallel port.


#Start Poll of DRO board
Set NumberOfPulses = Pulses From DRO Board
If NumberOfPulses < 10 Then feedrate = X
If NumberOfPulses > 10 and < 100 Then feedrate = X *2
If NumberOfPulses > 100 and < 1000 Then feedrate = X *3

#Compare the pulse count with the last time I polled the port
#If it's the same then issue a stop command, more or less
#determines direction

If NumberOfPulses = LastPollNumberOfPulses then Stop
If NumberOfPulses > LastPollNumberOfPulses then Direction = 1
    Send Continious command
If NumberOfPulses < LastPollNumberOfPulses then Direction = 0
    Send Continious command

#Assign the new pulsecount to the old pulsecount variable for comparison
#next time I poll the port.
LastPollNumberOfPulses = NumberOfPulses


Bill