5Axis Kinetic from 2.8 on 2.7x

Aciera
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6 years 1 month ago - 6 years 1 month ago #181769 by Aciera

Replied by Aciera on topic 5Axis Kinetic from 2.8 on 2.7x

So I deactivated all the limes of each of the axes

Ok put those lines back in.

I don't know how much experience you have with 5axis cnc machines. Maybe you know what you are doing but
I really think you're wanting to much to quickly. 5axis simultaneous is really a lot more complex than 3axis.

So stop running this gcode for now and focus on getting to know the 5 axis kinematics.

You need to start with small stuff like following the point of a pencil stuck to the table or something.

What I suggested was to set the tilting and rotating tables at 0° then touch off at the center/top of your rotating table.

[edit]
This guy has it figured out look at 0:56 to 1:11 :

Then you move to say X20 Z5

Then you rotate the rotating table by say 45° and check if the tool moves with the table.

Maybe this thread is worth having a look at:
forum.linuxcnc.org/10-advanced-configura...kinematics-x?start=0

I don't have a 5axis machine so I might not be able to help you much farther. Just take a step back and get your brain wrapped around things.

Last edit: 6 years 1 month ago by Aciera.

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JackRay
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6 years 1 month ago #181787 by JackRay

Replied by JackRay on topic 5Axis Kinetic from 2.8 on 2.7x

I have a lot of experience in usiange, all types of machines. On the other hand, none on the configuration of driver software (such as linuxcnc).
the program I have attached to you is simply chamfers on a rectangular piece (milling while rolling) not much simpler.

to overcome the problems of limits, I programmed a very small pocket.

no more limit problem. on the other hand always problems of joinutres.

I have noticed that the accelerations of the axes are too fast. apparently the limits given in the .ini file are not respected as for a "trivkins" configuration.

Are there no other joint parameters to perform?

Thank you for all the advice, I'm studying all the docs you send me. I'm sure I'm not too far off the mark, but like you say, I still have a lot to learn.

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Aciera
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6 years 1 month ago - 6 years 1 month ago #181828 by Aciera

Replied by Aciera on topic 5Axis Kinetic from 2.8 on 2.7x

Erreur de suivi jointure, I guess is due to excessive acceleration as you say.

You might have to reduce acceleration quite considerably.

As this user writes forum.linuxcnc.org/10-advanced-configura...tics?start=40#108666

One thing I noticed, there was considerable amount of Jerk in movements.
I did set acceleration down to compensate that.
I'm running 1800 mm/s2, on my axis, for 5-axis work 700-900 max.

But really I'm out of my depth here.

[edit]
Please post any findings as, maybe, one day I might actually get into 5axis machining in earnest.

Last edit: 6 years 1 month ago by Aciera.

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JackRay
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6 years 1 month ago #181894 by JackRay

Replied by JackRay on topic 5Axis Kinetic from 2.8 on 2.7x

Hello
Hello,

I managed to move all my axes simply with a "mid" command on the G1 A 20 F50 axis. I considerably reduce the feed speeds. No more joining or limit problems. On the other hand, the axes do not follow the pivot point and go in all directions.

My configuration defined the "C" axis in 4th join.

If I understand correctly the linuxcnc doc the "C" axis would correspond to the 5th join ..

is it correct ?

I tried, it doesn't work, but, do I have to change something else in the configuration files ?

thank you

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JackRay
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6 years 1 month ago #181895 by JackRay

Replied by JackRay on topic 5Axis Kinetic from 2.8 on 2.7x

I forgot, the offset of "tool offset" is not taken into account. whether on the "Y" or "Z" axis the modification of values does not change anything either ...

Regards

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Aciera
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6 years 1 month ago #181897 by Aciera

Replied by Aciera on topic 5Axis Kinetic from 2.8 on 2.7x

Do you have G43 activated?

You need to keep the joint numbering in order. Maybe compare with the simulation config:

Warning: Spoiler!

[EMC]
VERSION = 1.1
MACHINE = sim-xyzac-trt
DEBUG = 0

[DISPLAY]
OPEN_FILE = ./examples/impeller-7bl-xyzac.ngc
JOG_AXES = XYZC
DISPLAY = axis
POSITION_OFFSET = RELATIVE
POSITION_FEEDBACK = ACTUAL
MAX_FEED_OVERRIDE = 2
PROGRAM_PREFIX = ../../nc_files
INTRO_GRAPHIC = emc2.gif
INTRO_TIME = 1
#EDITOR = gedit
TOOL_EDITOR = tooledit z diam

TKPKG = Ngcgui 1.0
NGCGUI_FONT = Helvetica -12 normal
NGCGUI_SUBFILE = test-xyzac.ngc

[RS274NGC]
SUBROUTINE_PATH = ./examples
PARAMETER_FILE = xyzac.var

[HAL]
HALUI = halui
HALFILE = LIB:basic_sim.tcl

# vismach xyzac-trt-gui items
HALCMD = loadusr -W xyzac-trt-gui
HALCMD = net :table-x joint.0.pos-fb xyzac-trt-gui.table-x
HALCMD = net :saddle-y joint.1.pos-fb xyzac-trt-gui.saddle-y
HALCMD = net :spindle-z joint.2.pos-fb xyzac-trt-gui.spindle-z
HALCMD = net :tilt-a joint.3.pos-fb xyzac-trt-gui.tilt-a
HALCMD = net :rotate-c joint.4.pos-fb xyzac-trt-gui.rotate-c
HALCMD = net :tool-offset motion.tooloffset.z
HALCMD = net :tool-offset xyzac-trt-kins.tool-offset xyzac-trt-gui.tool-offset
HALCMD = net :y-offset xyzac-trt-kins.y-offset xyzac-trt-gui.y-offset
HALCMD = net :z-offset xyzac-trt-kins.z-offset xyzac-trt-gui.z-offset
HALCMD = sets :y-offset 20
HALCMD = sets :z-offset 10

[KINS]
KINEMATICS = xyzac-trt-kins
JOINTS = 5

[TRAJ]
COORDINATES = XYZAC
LINEAR_UNITS = mm
ANGULAR_UNITS = deg
DEFAULT_LINEAR_VELOCITY = 20
MAX_LINEAR_VELOCITY = 35
MAX_LINEAR_ACCELERATION = 400
DEFAULT_LINEAR_ACCELERATION = 300

[EMCMOT]
EMCMOT = motmod
SERVO_PERIOD = 1000000
COMM_TIMEOUT = 1

[TASK]
TASK = milltask
CYCLE_TIME = 0.010

[EMCIO]
EMCIO = io
CYCLE_TIME = 0.100
TOOL_TABLE = xyzac-trt.tbl

[AXIS_X]
MIN_LIMIT = -200
MAX_LIMIT = 200
MAX_VELOCITY = 20
MAX_ACCELERATION = 300

[JOINT_0]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = 20
MAX_ACCELERATION = 300
MIN_LIMIT = -200
MAX_LIMIT = 200
HOME_SEARCH_VEL = 0
HOME_SEQUENCE = 0

[AXIS_Y]
MIN_LIMIT = -100
MAX_LIMIT = 100
MAX_VELOCITY = 20
MAX_ACCELERATION = 300

[JOINT_1]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = 20
MAX_ACCELERATION = 300
MIN_LIMIT = -100
MAX_LIMIT = 100
HOME_SEARCH_VEL = 0
HOME_SEQUENCE = 0

[AXIS_Z]
MIN_LIMIT = -120
MAX_LIMIT = 120
MAX_VELOCITY = 20
MAX_ACCELERATION = 300

[JOINT_2]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = 20
MAX_ACCELERATION = 300
MIN_LIMIT = -120
MAX_LIMIT = 120
HOME_SEARCH_VEL = 0
HOME_SEQUENCE = 0

[AXIS_A]
MIN_LIMIT = -100
MAX_LIMIT = 50
MAX_VELOCITY = 30
MAX_ACCELERATION = 300

[JOINT_3]
TYPE = ANGULAR
HOME = 0
MAX_VELOCITY = 30
MAX_ACCELERATION = 300
MIN_LIMIT = -100
MAX_LIMIT = 50
HOME_SEARCH_VEL = 0
HOME_SEQUENCE = 0

[JOINT_4]
TYPE = ANGULAR
HOME = 0
MAX_VELOCITY = 30
MAX_ACCELERATION = 300
MIN_LIMIT = -36000
MAX_LIMIT = 36000
HOME_SEARCH_VEL = 0
HOME_SEQUENCE = 0

[AXIS_C]
MIN_LIMIT = -36000
MAX_LIMIT = 36000
MAX_VELOCITY = 30
MAX_ACCELERATION = 300

[JOINT_5]
TYPE = ANGULAR
HOME = 0
MAX_VELOCITY = 30
MAX_ACCELERATION = 300
MIN_LIMIT = -36000
MAX_LIMIT = 36000
HOME_SEARCH_VEL = 0
HOME_SEQUENCE = 0

[JOINT_8]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = 200
MAX_ACCELERATION = 800
MIN_LIMIT = -500
MAX_LIMIT = 500
HOME_SEARCH_VEL = 0
HOME_SEQUENCE = 0

The following user(s) said Thank You: JackRay

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