Feed rates?

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02 Mar 2016 14:20 #70909 by andypugh
Replied by andypugh on topic Feed rates?

I have no idea what kinematics it is running.


it will be in the HAL file.

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02 Mar 2016 14:28 #70910 by tjamscad
Replied by tjamscad on topic Feed rates?
Kimatics is custom
Attachments:

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02 Mar 2016 14:44 #70911 by andypugh
Replied by andypugh on topic Feed rates?
Is this one of the ones at MPM?

Cincikins is a non-trivial kinematcs, which means that the [TRAJ]DEFAULT_ACCELERATION will be used for combined moves.
In your config that number seems lower than the individual axis values. You could try increasing it.

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02 Mar 2016 14:57 #70913 by tjamscad
Replied by tjamscad on topic Feed rates?
Yes it is the famous Blue machine. What if I just want to change the single positioning moves. It make great parts I am just trying to make it run better. (faster) The combined 5 axis moves I dont want to mess with.

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02 Mar 2016 15:24 #70916 by andypugh
Replied by andypugh on topic Feed rates?
When I saw the machine it was running quite an ancient version of LinuxCNC, is that still the case?

The machine probably could move faster with a trivial kinematics. With non-trivial kins the axes have to be set at speeds so that velocity limits are maintained in compound moves. This isn't very clever and I _think_ has been fixed in the Joints_Axes experimental branch.

Does the machine actually hit the X-Axis speed limit in a straight X move?

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02 Mar 2016 15:53 #70917 by Todd Zuercher
Replied by Todd Zuercher on topic Feed rates?
I don't know anything about your kinematics, but in your ini file you have the A and B axis set to MAX_VELOCITY = 1.2 deg/sec (or 72deg/min) and X and Y are 1.6 inches/sec (96 inches/min) Z is 1.1 (or 66ipm). If you want to go 140ipm and 160 deg/min these will need to be bumped up to 2.334 ips and 2.667dps. But that might not be every thing that needs changed because of your kinematics (but it might be a start).

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02 Mar 2016 17:06 #70923 by tjamscad
Replied by tjamscad on topic Feed rates?
Yes it would apear to be running 96ipm. Is there a way to check it. This is using the Axis UI.
Does the trajectory planner section mean anything?

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02 Mar 2016 21:15 - 02 Mar 2016 21:16 #70930 by Todd Zuercher
Replied by Todd Zuercher on topic Feed rates?
Yes the settings in the TRAJ section do mean something, They set the maximums for the interpolated velocities through the kinematics, and the limits and default settings for the jog sliders. A good example of when the MAX_VELOCITY = ? in the TRAJ section might come into play; command a G0 move from X0Y0 to X20Y20. If your max velocities for X and Y are 140ipm, the actual max the machine could achieve in that move would be about 198ipm. If you add a Z move to that with the same 140ipm now the velocity becomes 242ipm (isn't geometry fun, thank you Pythagoras). In reality other than for positioning moves this extra speed isn't of much use, cutting feeds should probably be limited to the max speed of the slowest axis used.
Last edit: 02 Mar 2016 21:16 by Todd Zuercher.

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02 Mar 2016 21:22 - 02 Mar 2016 21:30 #70932 by tjamscad
Replied by tjamscad on topic Feed rates?
So if my trajectory section is less ipm than the axis sections it will only go as fast as the trajectory section? The over rides are set to 2.0 that means 200%? So technically my base rapid speed could be 200% of my base feed speed? It seems like the Trajetory section doesn't make sense with my axis section?

###############################################################################
# Trajectory planner section
###############################################################################
[TRAJ]
#
AXES = 9
COORDINATES = X Y Z A B C U V W
HOME = 0 0 0 0 0 0 0 0 0
LINEAR_UNITS = inch
ANGULAR_UNITS = degree
CYCLE_TIME = 0.010
DEFAULT_VELOCITY = 1.67
MAX_VELOCITY = 4.0
MAX_ACCELERATION = 100.0
DEFAULT_ACCELERATION = 1.0
TLO_IS_ALONG_W = 1

###############################################################################
# Axes sections
###############################################################################

[AXIS_0]
TYPE = LINEAR
HOME = 0.000
#MAX_VELOCITY = 1.6
#Adjusted MAX_VELOCITY to 140ipm was 96ipm
MAX_VELOCITY = 2.334
MAX_ACCELERATION = 5.0
INPUT_SCALE = 20000
OUTPUT_SCALE = 1.000
MIN_LIMIT = -121.850
MAX_LIMIT = .70
COMP_FILE_TYPE = 1
COMP_FILE = Xaxis.cmp
FERROR = 10.0
MIN_FERROR = 10.0
HOME_OFFSET = 0.5
HOME_SEARCH_VEL = 0.3
HOME_LATCH_VEL = -0.01
HOME_USE_INDEX = yes
HOME_IGNORE_LIMITS = yes
HOME_SEQUENCE = 1
DEADBAND = 8e-05
PID_MAX_VEL = 0
P = 250
I = 0
D = 4
BIAS = 0
FF0 = 0
FF1 = 2.06
FF2 = 0.04

###############################################################################
Last edit: 02 Mar 2016 21:30 by tjamscad.

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03 Mar 2016 22:52 #70999 by tjamscad
Replied by tjamscad on topic Feed rates?
I do not understand the terminology used in LinuxCNC. If I want to adjust my axis feed rate what is that called? If I want to adjust my axis rapid feed rate what is that called?

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