X and Y axis direction Problems

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01 Jun 2013 22:24 - 01 Jun 2013 22:46 #35099 by gww250
Had some time this morning so I took my ngc file over to a friends house. He and I bought our mills at the same time and used the same live CD to install Linuxcnc. His computer is about 5 years older than mine and uses an AMD processor. The ngc program runs perfectly on his machine.
Here's the ini file I'm using:

# EMC controller parameters for generic controller. Make these what you need
# for your system.

# General note: Comments can either be preceded with a # or ; - either is
# acceptable, although # is in keeping with most linux config files.

# Settings with a + at the front of the comment are likely needed to get 
# changed by the user.
# Settings with a - at the front are highly unneeded to be changed
###############################################################################
# General section 
###############################################################################
[EMC]

#- Version of this INI file
VERSION =               $Revision$

#+ Name of machine, for use with display, etc.
MACHINE =               LinuxCNC-HAL-STEP-IN

#+ Debug level, 0 means no messages. See src/emc/nml_int/emcglb.h for others
DEBUG = 0
# DEBUG =               0x00000007
# DEBUG =               0x7FFFFFFF

###############################################################################
# Sections for display options 
###############################################################################
[DISPLAY]

#+ Name of display program, e.g., xemc
DISPLAY =              axis
# DISPLAY =              usrmot
# DISPLAY =              mini
# DISPLAY = 		tkemc
# Cycle time, in seconds, that display will sleep between polls
CYCLE_TIME =            0.200

#- Path to help file
HELP_FILE =             tklinucnc.txt

#- Initial display setting for position, RELATIVE or MACHINE
POSITION_OFFSET =       RELATIVE

#- Initial display setting for position, COMMANDED or ACTUAL
POSITION_FEEDBACK =     ACTUAL

#+ Highest value that will be allowed for feed override, 1.0 = 100%
MAX_FEED_OVERRIDE =     1.2

#- Prefix to be used
PROGRAM_PREFIX = /home/gary/linuxcnc/nc_files

#- Introductory graphic
INTRO_GRAPHIC =         linuxcnc.gif
INTRO_TIME =            5


###############################################################################
# Task controller section 
###############################################################################
[TASK]

# Name of task controller program, e.g., milltask
TASK =                  milltask

#- Cycle time, in seconds, that task controller will sleep between polls
CYCLE_TIME =            0.010

###############################################################################
# Part program interpreter section 
###############################################################################
[RS274NGC]

#- File containing interpreter variables
PARAMETER_FILE =        stepper.var

###############################################################################
# Motion control section 
###############################################################################
[EMCMOT]

#- Name of the motion controller to use (only one exists for nontrivkins)
EMCMOT =                motmod

#- Timeout for comm to emcmot, in seconds
COMM_TIMEOUT =          1.0

#- Interval between tries to emcmot, in seconds
COMM_WAIT =             0.010

#+ Base task period, in nanosecs - this is the fastest thread in the machine
BASE_PERIOD =           50000
#- Servo task period, in nanosecs - will be rounded to an int multiple of BASE_PERIOD
SERVO_PERIOD =          1000000

###############################################################################
# Hardware Abstraction Layer section
###############################################################################
[HAL]

# The run script first uses halcmd to execute any HALFILE
# files, and then to execute any individual HALCMD commands.
#

# list of hal config files to run through halcmd
#+ files are executed in the order in which they appear
HALFILE =               core_stepper.hal
#HALFILE =               xylotex_pinout.hal
HALFILE =               standard_pinout.hal

#- list of halcmd commands to execute
# commands are executed in the order in which they appear
#HALCMD =                save neta

###############################################################################
# Trajectory planner section
###############################################################################
[TRAJ]
#+ machine specific settings
AXES =                  3
# COORDINATES =         X Y Z A B C
COORDINATES =           X Y Z
HOME =                  0 0 0
LINEAR_UNITS =          inch
ANGULAR_UNITS =         degree
CYCLE_TIME =            0.010
DEFAULT_VELOCITY =      0.18
MAX_VELOCITY =          .36
DEFAULT_ACCELERATION =  2.0
MAX_ACCELERATION =      2.0

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

#+ First axis
[AXIS_0]

TYPE =                          LINEAR
HOME =                          0.000
MAX_VELOCITY =                  .36
# NOTE:  the step generator module applies its own limits to
# acceleration and velocity.  We have discovered that it needs
# to have a little "headroom" over the accel by the trajectory
# planner, otherwise it can fall slightly behind during accel
# and later overshoot as it catches up.  In the long term we
# hope to come up with a clean fix for this problem.  In the
# meantime, please set STEPGEN_MAXACCEL below to a few percent
# higher than the regular acceleration limit MAX_ACCELERATION
MAX_ACCELERATION =              2
STEPGEN_MAXACCEL =              2.2
BACKLASH =                      0.000
SCALE =                   16000
MIN_LIMIT =                    -10
MAX_LIMIT =                     10.0
FERROR =                        01.00
MIN_FERROR =                    0.01
HOME_OFFSET =                   0.0
HOME_SEARCH_VEL =               0.0
HOME_LATCH_VEL =                0.0
HOME_USE_INDEX =                NO
HOME_IGNORE_LIMITS =            NO

#+ Second axis
[AXIS_1]

TYPE =                          LINEAR
HOME =                          0.000
MAX_VELOCITY =                  .36
MAX_ACCELERATION =              2.0
STEPGEN_MAXACCEL =              2.20
BACKLASH = 0.000
SCALE =                   	-16000
MIN_LIMIT =                     -10.0
MAX_LIMIT =                     10.0
FERROR = 1
MIN_FERROR = .01
HOME_OFFSET =                    0.0
HOME_SEARCH_VEL =                0.0
HOME_LATCH_VEL =                 0.0
HOME_USE_INDEX =                 NO
HOME_IGNORE_LIMITS =             NO

#+ Third axis
[AXIS_2]

TYPE =                          LINEAR
HOME =                          0.0
MAX_VELOCITY =                  .36
MAX_ACCELERATION =              2
STEPGEN_MAXACCEL =              2.20
BACKLASH = 0.000
SCALE =                   -16000
MIN_LIMIT =                     -10.0
MAX_LIMIT =                     10.0
FERROR = 01.00
MIN_FERROR = 0.010
HOME_OFFSET =                    0.0
HOME_SEARCH_VEL =                0.0
HOME_LATCH_VEL =                 0.0
HOME_USE_INDEX =                 NO
HOME_IGNORE_LIMITS =             NO

###############################################################################
# section for main IO controller parameters 
###############################################################################
[EMCIO]

#- Name of IO controller program, e.g., io
EMCIO = 		io

#- cycle time, in seconds
CYCLE_TIME =            0.100

#- tool table file
TOOL_TABLE =            stepper.tbl
Last edit: 01 Jun 2013 22:46 by BigJohnT. Reason: add code tags

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02 Jun 2013 05:08 #35123 by Rick G
You might want to look at the voltage you are getting on the direction pins, 0 volts one direction 5 volts the other is perfect.
Some computers only have about 3.5 volts which can be a problem with some breakout boards.
As you probably saw it seems that the parallel port mode may also effect this voltage somewhat.

Rick G

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03 Jun 2013 04:20 #35156 by gww250
You're right as to voltage being the root of the problem. The port works best set to EPP. I did some more net research and it seems that many of the newer systems have 1.8 to 3.5 volts on the lpt port and the Sherline 8760 needs 3V minimum. The Sherline signal booster came in late yesterday but I haven't hooked it up yet.
I really appreciate the time people have taken to help me with this problem. As I mentioned before I 've been using EMC (Linuxcnc) on other machines for some time and I'm sold on it after using other packages for years.

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03 Jun 2013 04:30 #35158 by cncbasher
glad at least your now starting to pin down the problem ,

get back with your findings it realy does help , to document these problems .

you'll find most people to be helpful here , so don't worry and keep posting !

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20 Sep 2014 10:59 #51372 by amiranda
I had the same issue and I call sherline several times they send me two different controls boxes and no luck, the even ask me for the program I was running , no answer, they also send me new motors , and the X and Y axis were still moving in the wrong direction, I noted the when I ran the program the first time of the day it took a little longer to start acting up, so I took the cover of the controller off and placed a fan on it, ran the program several time after and did not fail again, so I installed a cooling fan over the box and is been working since, I don't have pics of the installation, but is very simple, I took power from the controller swith so every time I turn it on the fan come on, just be care full with voltage, the controller box I think is 12 V and most computer fans are 5V, I used a resistor to drop the voltage. take the cover off and cool it down while the program is running and if it work install a fan. I hope this work for you.

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