Re: [CAD_CAM_EDM_DRO] some of the strange problems with EMC [asimtec]

Asim Khan wrote:

>Thanks Ray and Jon for replying to my post about "G54,G55"
>
>I have noticed (many times) that sometimes when you run a program and
>then you run another program next time (without closing and re
>running) the interpreter runs this second program with a Feed value
>which was being used in the last program. Although this second
>program has the command for feed (for example F500).
>
>Also I've noticed that sometimes G28 homes the axes at very slow feeds
>although the feed in program is much higher.
>
>Sometimes when you run a program and interpreter encounters for
>example "g01 x5 y10" and axis starts moving to some very strange
>positions mostly towards hardware limits!
>
>Another problem i've seen is that EMC displays old error message. Like
>if you had +ve limit on x axis once, and you get get -limit on y axis
>then EMC displays the old message that "+Ve limit on x-axis".
>It seems as if the message boxes being displayed in EMC lag by on Old
>message.
>
>I am using BDI-EMC version 2.16 and I had tried the previous versions
>also but all had these problem. I am using Servo2Go 8 axis Card. and
>my display program is tkEMC.
>
>

I have seen some of this slow feed behavior, too. I think it mostly
crops up when
switching back and forth between manual and auto modes, and especially
when also using some MDI commands. One thing I have seen on the very
oldest versions was that hitting 9 then 0 would restore the feed rate,
ie. that
a low feed rate override had somehow gotten set.

I really don't believe that I've seen the other odd behaviors. There
was a bug
a long time ago where if you interrupted a multi-axis move (such as G01
X1 Y2)
with the esc key, and then programmed a single axis move such as G01 X-1,
you would actually see movement to X-1 Y2. I'm quite sure this problem has
been fixed long before the BDI came about.

I may have seen wrong error boxes on occasion, I'm not sure. I AM sure that
the error boxes are not ALWAYS delayed by one message. It is possible for
these error boxes to stack up, however. Since they are modal, they
won't let you
do anything on the screen until they are OK'd, so I don't think that's
what you are
seeing.

I have not done any work on EMC in metric units, and it is known there
are some
quirks in the metric setup.

Jon