Unfortunately there are replies in this thread which are not in sync and
don't include other replies.
Now that I realise you are attempting rigid tapping on a mill, not
wanting to reverse direction for some inexplicable reason on a lathe, it
becomes clearer.
You need a quadrature encoder and use G33.1
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Rigid_Tapping
On 23/04/2017 18:00, Sag ich Dir nich wrote:
so you mean that it is not possible? If thats the case, then i have to
manually cut threads until it is possible :)
thats probably something that has to be changed in linuxcnc/machinekit
(that, in case of a stepgen velocity spindle config, the direction pin
only changes state after ramping down to 0 rpm and then changing state.)
Am Sonntag, 23. April 2017 14:20:46 UTC+2 schrieb Schooner:
On 23/04/17 12:35, Sag ich Dir nich wrote:
i noticed now, that when i command m4 and then m5, the dir pin
changes also, which it should not. It does not change when i
command m3 and then m5
That may be reverting to default state.
Mine has to latch the relay to engage M4, but M3 is its 'resting
state'.
Same for dir, there will be a default, exactly what depends upon
whether you are using the pin value or its inverted value, that
corresponds
to one dir or the other when it is powered off.
Am Sonntag, 23. April 2017 10:59:59 UTC+2 schrieb Schooner:
There was something very familiar about this config, I
realised it is adapted from a lathe config I have, using a
velocity stepgen, complete with the same comments :-)
I must have passed it on at some point.
On 22/04/17 19:47, Sag ich Dir nich wrote:
Hello,
i got the Step/Dir Spindle working with ramping and
everything except if i command M4 the Dir pin changes
immediately. It should change when the current rpm is 0.
What do you base the assertion that it should only change
when RPM is 0 upon?
This old thread discusses the issue and I don't think
anything has changed
https://en.industryarena.com/forum/reverse-lathe-turn-m3-m4--67203.html
<https://en.industryarena.com/forum/reverse-lathe-turn-m3-m4--67203.html>
You don't have any connections in your config that will
ensure this, no spindle brake, no monitor of spindle speed.
The dir pin is a simple bit pin, set to forward or reverse.
An easy way to do this is just program
M3 S100
...
M5
G4 P5 ;delay to ensure spindle stops
M4 S100
Alternately, if you have a spindle brake it needs tying to
M5, using detection of 0 RPM spindle etc.
The only reason you would reverse spindle direction on a
lathe normally, is switching from a conventional cutting
tool, to a threading tool or parting tool which
is held inverted to aid chip removal or something similar.
There is plenty of time to stop the spindle and restart it,
before or after the tool change.
regards
Here is my spindle config:
# ################
# B [4] SPINDEL
# ################
# Use a scale module for offset and scaling of the stepgen
# Offset and scale are determined by first calculating and
testing
#
loadrt scale count=1
addf scale.0 servo-thread
setp scale.0.in <http://scale.0.in> 0
setp scale.0.gain 1.00 # GIVES TRUE 600 RPM in M4
setp scale.0.offset 0
#
# Initialise the stepgen for the spindle
#
setp hpg.stepgen.04.position-scale 1
setp hpg.stepgen.04.maxvel 8000
setp hpg.stepgen.04.steplen 1000
setp hpg.stepgen.04.stepspace 1000
setp hpg.stepgen.04.dirhold 200
setp hpg.stepgen.04.dirsetup 200
setp hpg.stepgen.04.maxaccel 2000
setp hpg.stepgen.04.steppin 924
setp hpg.stepgen.04.dirpin 926
setp hpg.stepgen.04.control-type 1
# Enable it
net machineison halui.machine.is-on => hpg.stepgen.04.enable
# Connect spindle speed to scaler
net spindle-cmd motion.spindle-speed-out => scale.0.in
<http://scale.0.in>
# Connect scaler output to stepgen velocity
net spindle-freq <= scale.0.out => hpg.stepgen.04.velocity-cmd
# Connect output to the pin for the analog voltage of
spindle2 board
net spindle-out <= hpg.stepgen.04.steppin => #924
#bb_gpio.p9.out-24
# Some problems setting up logic to match the reversing
contactor
# This works, connecting CCW to stepgen DIR to Spindle2 DIR
net spindle-rev motion.spindle-reverse => bb_gpio.p9.out-26
i tried commenting out "net spindle-rev
motion.spindle-reverse => bb_gpio.p9.out-26" but then it
does not change the direction
basically what i need is the direction pin to change, when i
command the opposite direction, at 0 rpm, after the spindle
has ramped down for example
M3 S100
M4 S100 (spindle ramps down to 0 rpm then the Dir pin
changes state and the spindle ramps up again)
i appreciate any help
--
website: http://www.machinekit.io blog:
http://blog.machinekit.io github: https://github.com/machinekit
---
You received this message because you are subscribed to the
Google Groups "Machinekit" group.
To unsubscribe from this group and stop receiving emails
from it, send an email to [email protected].
Visit this group at
https://groups.google.com/group/machinekit
<https://groups.google.com/group/machinekit>.
For more options, visit https://groups.google.com/d/optout
<https://groups.google.com/d/optout>.
--
website: http://www.machinekit.io blog: http://blog.machinekit.io
github: https://github.com/machinekit
---
You received this message because you are subscribed to the
Google Groups "Machinekit" group.
To unsubscribe from this group and stop receiving emails from it,
send an email to [email protected] <javascript:>.
Visit this group at https://groups.google.com/group/machinekit
<https://groups.google.com/group/machinekit>.
For more options, visit https://groups.google.com/d/optout
<https://groups.google.com/d/optout>.
--
website: http://www.machinekit.io blog: http://blog.machinekit.io
github: https://github.com/machinekit
---
You received this message because you are subscribed to the Google
Groups "Machinekit" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to [email protected]
<mailto:[email protected]>.
Visit this group at https://groups.google.com/group/machinekit.
For more options, visit https://groups.google.com/d/optout.
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github:
https://github.com/machinekit
---
You received this message because you are subscribed to the Google Groups "Machinekit" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
Visit this group at https://groups.google.com/group/machinekit.
For more options, visit https://groups.google.com/d/optout.
