Homing new build cnc plasma table
13 Jan 2020 21:01 #154783
by PeteJM
Homing new build cnc plasma table was created by PeteJM
Hi all,
I have just built a cnc plasma table and am having issues with homing it correctly. I built a config using the 7i96 config tool. It would home all axis but once homing was completed, i could only move the axis between the limit switch and home offset position not the full width of the table. I managed to over come this by putting a - on the home_search_vel, which moved the home positions and the x + y axis now seem to work ok, but it doesn't work for the z axis as it needs to home at the max limit.
Before i altered the home_search_vel the machine would home to the right on the x axis and furthest away on the y axis, which seems incorrect compared to where 0,0,0 is on linuxcnc. When i jog all the axis they move the correct way compared to what linuxcnc thinks.
Why would it be homing in the opposite direction to what it should be on the x+y axis?
And how do i overcome the z axis not being able to move past the home offset position once homed?
This is what the unaltered ini file shows -
HOME = 0
HOME_OFFSET = 5
HOME_SEARCH_VEL = 5
HOME_LATCH_VEL = 1
I've changed the ini file to this for x+y axis - (it seems to work but i don't think its correct)
HOME = 5
HOME_OFFSET = 0
HOME_SEARCH_VEL = -5
HOME_LATCH_VEL = 1
Any ideas?
Thanks,
Pete
I have just built a cnc plasma table and am having issues with homing it correctly. I built a config using the 7i96 config tool. It would home all axis but once homing was completed, i could only move the axis between the limit switch and home offset position not the full width of the table. I managed to over come this by putting a - on the home_search_vel, which moved the home positions and the x + y axis now seem to work ok, but it doesn't work for the z axis as it needs to home at the max limit.
Before i altered the home_search_vel the machine would home to the right on the x axis and furthest away on the y axis, which seems incorrect compared to where 0,0,0 is on linuxcnc. When i jog all the axis they move the correct way compared to what linuxcnc thinks.
Why would it be homing in the opposite direction to what it should be on the x+y axis?
And how do i overcome the z axis not being able to move past the home offset position once homed?
This is what the unaltered ini file shows -
HOME = 0
HOME_OFFSET = 5
HOME_SEARCH_VEL = 5
HOME_LATCH_VEL = 1
I've changed the ini file to this for x+y axis - (it seems to work but i don't think its correct)
HOME = 5
HOME_OFFSET = 0
HOME_SEARCH_VEL = -5
HOME_LATCH_VEL = 1
Any ideas?
Thanks,
Pete
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- tommylight
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13 Jan 2020 21:19 #154784
by tommylight
Replied by tommylight on topic Homing new build cnc plasma table
Please attach the hal and ini file.
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13 Jan 2020 21:44 #154786
by PeteJM
Replied by PeteJM on topic Homing new build cnc plasma table
FIND ATTACHED
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- Todd Zuercher
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13 Jan 2020 22:05 - 13 Jan 2020 22:07 #154788
by Todd Zuercher
Replied by Todd Zuercher on topic Homing new build cnc plasma table
That all sounds normal, If your home/limit switch is at the negative end of travel (left side for X and front/closest for Y) your search velocity setting should be negative. For your Z axis since the home/limit switch is at the top/positive end it's search velocity should be positive.
Last edit: 13 Jan 2020 22:07 by Todd Zuercher.
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13 Jan 2020 22:23 #154789
by PeteJM
Replied by PeteJM on topic Homing new build cnc plasma table
Ok, once they are homed the z axis won’t lower. It will only move between the limit switch and home offset. Any ideas?
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13 Jan 2020 22:45 #154791
by Clive S
Re :-
[JOINT_3]
AXIS = Z
MIN_LIMIT = 0
MAX_LIMIT = 170 Try -170
It is more normal for the Z axis to be -ve going down.
Replied by Clive S on topic Homing new build cnc plasma table
Ok, once they are homed the z axis won’t lower. It will only move between the limit switch and home offset. Any ideas?
Re :-
[JOINT_3]
AXIS = Z
MIN_LIMIT = 0
MAX_LIMIT = 170 Try -170
It is more normal for the Z axis to be -ve going down.
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15 Jan 2020 09:19 #154897
by PeteJM
Replied by PeteJM on topic Homing new build cnc plasma table
Thanks changing to negative has solved that. Tested it and all was working well. but i have run the plasmaC config and now the homing and limit switches have stopped working. I have opened the hal meter and a signal is being received from the switches.
Anyone got a solution? i have attached the ini and hal files
Anyone got a solution? i have attached the ini and hal files
Attachments:
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15 Jan 2020 09:45 #154900
by Clive S
Replied by Clive S on topic Homing new build cnc plasma table
Homing sequence for dual motors in the ini file you need both to be the same number and -ve
ie HOME_SEQUENCE = 1 should be -1 for both. Also you need to use home-all and not use jog until they are homed
ie HOME_SEQUENCE = 1 should be -1 for both. Also you need to use home-all and not use jog until they are homed
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15 Jan 2020 10:30 #154905
by PeteJM
Replied by PeteJM on topic Homing new build cnc plasma table
Thanks will change that. When I press home all, the x axis drives to the home switch and doesn’t stop moving in that direction and hits the stops. it’s like the home switch is not working but it does send a signal in Hal meter. It’s the same in all axis. It worked perfectly before I loaded the plasmac config.
Any idea?
Any idea?
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15 Jan 2020 14:05 #154919
by andypugh
Replied by andypugh on topic Homing new build cnc plasma table
The INI references three HAL files, can you attach them all?
HALFILE = cnc_plasma.hal
# the plasmac component connections
HALFILE = plasmac.hal
# the plasmac machine connections
HALFILE = cnc_plasma_connections.hal
There are no home / limit connections at all in the HAL you attached previously.
HALFILE = cnc_plasma.hal
# the plasmac component connections
HALFILE = plasmac.hal
# the plasmac machine connections
HALFILE = cnc_plasma_connections.hal
There are no home / limit connections at all in the HAL you attached previously.
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