On 7/3/23 19:32, Nicklas SB Karlsson wrote:
Which version of Linuxcnc did you try it on?
Den 2023-06-28 kl. 19:52, skrev John Dammeyer:
So this morning I whipped up a small g-code program to test the
tapping. I
started a fresh LinuxCNC so that most of the parameters were default.
Did a HOME command and then moved to the logical home position with a
G0 X0
Y0 G0 Z0.
Then loaded this program.
G17 G20 G40 G90
G1 X0 Y0 F20
G1 Z0
S200 M3
G33.1 Z-0.7 K0.05 I3.0
g0 Z0.5
M5
M2
%
The program loaded without errors.
What's interesting is that this time although the knee went back down
at 3x
the speed after tapping the end result was a "Joint 2 following error"
Remove the I3.0 and the following error does not happen. Works with I1.5
but not I2.0.
I suspect it should throw a following error at I3 in any event. The docs
are quite concise:
"I - optional spindle speed multiplier for faster return move"
And your machine is not able to follow that great a speedup. It may
also be suffering from excessive backlash as that move also takes time
that throws following errors quite easily for backlash comps over a thou
in my experience here.
YMMV of course. Since that is z motion, and heads or knees are heavy,
there is effectively no backlash as long as the withdrawal speed is
below gravity's acceleration AND the spindle has the speed reserve to
keep up.
I'd try -I1.5 as a half the 3 compromise and gradually increase/decrease
it to see where the limit might be on your machine. Or not use the I
option. Don't forget that 3x the spindle speed may be beyond the
spindles capability. Even a slightly out of tune PID can affect how well
the -I option works. I haven't used it myself, but I'd assume a -I0.5,
would slow the return on a moving head machine. In case the weight of
the head is almost more that the motor can lift.
Some experimentation to find the limits of your machine is in order, but
I believe I'd tap air, its cheaper than broken taps. ;o)>
Not sure why that is. It worked the other day, even from the MDI
entry with
I3.0. And now it also generates the following error from the MDI.
I'm going to guess either the machine is cold and a bit stiff or there
were
some other parameters the other day set that prevented the fault.
In either case, I do not get a fault loading the program.
John
-----Original Message-----
From: Nicklas SB Karlsson [mailto:n...@nksb.eu]
Sent: June 28, 2023 6:30 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] G33.1 error then g-code file parsed
Have used the latest origin/master not more than a few weeks old but
have not checked against older version. Will do this sooner or later,
hopefully within a week.
Den 2023-06-26 kl. 07:29, skrev John Dammeyer:
OK.
I'll try that for you.
I'm wondering if perhaps spindle acceleration time or some other HAL
parameter gets flagged with an incorrect error message. I've done
power
tapping from .ngc files without issue but I've not used the 'I'
parameter.
John
-----Original Message-----
From: Nicklas SB Karlsson [mailto:n...@nksb.eu]
Sent: June 25, 2023 10:09 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] G33.1 error then g-code file parsed
Run from MDI then there is no error message for me either. Put the same
rows in a .ngc file adding M2 and bottom there is an interpreter error
message then loading the file and display not updated. Looking at bottom
the program is however actually loaded and seems to work OK.
Nicklas Karlsson
Den 2023-06-26 kl. 01:26, skrev John Dammeyer:
I ran the following commands from the MDI without issue from AXIS 2.8.1
with
MESA 7i92H controlling an AC Servo motor (step/dir) for the spindle.
G1 X0 Y0 F20
G1 Z0
S200 M3
G33.1 Z-0.7 K0.05 I3.0
M5
Interesting watching the spindle RPM indicator, and you can hear it too
of
course.
Goes down to tap the 0.05" pitch (20TPI thread) at 200RPM
Reverses and goes up at 600 RPM.
Without the I3.0 it goes up at 200 RPM.
John
-----Original Message-----
From: Nicklas SB Karlsson [mailto:n...@nksb.eu]
Sent: June 25, 2023 9:07 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] G33.1 error then g-code file parsed
There is positioning move XYZ in real program but happened to remove
them then I should make a small test case.
Adding positioning move to test case make no difference. Linuxcnc
report
a file interpretation error and do not update display but program seems
to work supposed to.
Nicklas Karlsson
Den 2023-06-23 kl. 16:20, skrev Chris Radek:
I would add positioning moves (positioning all of XYZ) before the
G33.1 because otherwise the tapped hole can be anywhere - the
program is indeterminate. This sure might mess up any attempt by
your GUI to check the program or generate a preview.
Chris
On Wed, Jun 14, 2023 at 09:14:20PM +0200, Nicklas SB Karlsson wrote:
I put the lines below into a file:
?? M3 S100
?? G33.1 Z-30.474 K0.8 I3.000
?? M5
?? M2
Then I read into Linuxcnc I get error message:
?? parse_file interp_error
Removing the line with G33.1 then no error message so it is something
with this row. Program do however execute as expected with G33.1 line
even though there is an error message so no real problem. Also
execute
without an error message if run manually in MDI mode. Use
origin/master
last commit Mon May 8 16:10:03 2023 +0200
404aa407f136ce91a3e6bf911c7bda54011a74e9 Anybody else had similar
problem?
Nicklas Karlsson
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