Quick Tip: IF you have Home/Limit Switches, here is an example and description on setting them up
Posted: Wed Oct 11, 2017 10:25 am
IF YOU HAVE HOME/LIMIT SWITCHES:
Basic info first. This is a screen shot of my benchtop mill. It has ONE switch at Z+, X- and Y-. Since there is only one switch, it is configured in the Wizard as:
(PRIMARY SYSTEM CONFIGURATION TAB)
INPUT1 = FIRSTAXISHOMELIMIT
INPUT 2 = SECONDAXISHOMELIMIT
INPUT 3 = THIRDAXISHOMELIMIT
Alternatively and suggested method for wiring Home Switches from Centroid is to use "HomeAll" on Input 1 and wire all Home Switches into Input one.
INPUT1 = HomeAll
INPUT 2 =
INPUT 3 =
(AXIS CONFIGURATION TAB)
HOMING TYPE = Home to Switch (Because I have limit switch this tells the machine on power up to seek home switches when CYCLE START is pressed)
HOMING DIRECTION = Under the X column it is set to -(M91) (This tells the control to seek the X axis home/limit by moving in the NEGATIVE direction)
HOMING DIRECTION = Under the Y column it is set to -(M91) (This tells the control to seek the Y axis home/limit by moving in the NEGATIVE direction)
HOMING DIRECTION = Under the Z column it is set to +(M92) (This tells the control to seek the Z axhis home/limit by moving in the POSITIVE direction)
(Homing direction also creates your CNCM.HOM file, when you WRITE SETTINGS TO CNC CONTROL, this file is what the machine uses to seek home switches when you press CYCLE START on Power up)
Homing Sequence X=3, Y=2, Z=1 (The control will seek Z axis home switch first, then Y axis home switch, then X axis home switch)
Travel Limit(+) This tells the control how far in the POSITIVE direction there is in axis travel. This sets the soft limit. SO, if we have a home/limit switch at -X, then the machine in this example can travel 6.2" in the POSITIVE direction before it hits its soft limit.
For Y in this example, since we have a home/limit switch at -Y, then the machine in this example can travel 5" in the POSITIVE direction before it hits its soft limit.
For Z in this example, since we have a home/Limit switch at +Z, then the machine in this example can travel -4" in the NEGATIVE direction before it hits its soft limit.
PLEASE NOTE, if your machine moves in the -NEGATIVE direction, you must put the - in front of the distance traveled number, (-4 in this example)
If you don't setup home/limits correctly your machine will not move correctly.
Basic info first. This is a screen shot of my benchtop mill. It has ONE switch at Z+, X- and Y-. Since there is only one switch, it is configured in the Wizard as:
(PRIMARY SYSTEM CONFIGURATION TAB)
INPUT1 = FIRSTAXISHOMELIMIT
INPUT 2 = SECONDAXISHOMELIMIT
INPUT 3 = THIRDAXISHOMELIMIT
Alternatively and suggested method for wiring Home Switches from Centroid is to use "HomeAll" on Input 1 and wire all Home Switches into Input one.
INPUT1 = HomeAll
INPUT 2 =
INPUT 3 =
(AXIS CONFIGURATION TAB)
HOMING TYPE = Home to Switch (Because I have limit switch this tells the machine on power up to seek home switches when CYCLE START is pressed)
HOMING DIRECTION = Under the X column it is set to -(M91) (This tells the control to seek the X axis home/limit by moving in the NEGATIVE direction)
HOMING DIRECTION = Under the Y column it is set to -(M91) (This tells the control to seek the Y axis home/limit by moving in the NEGATIVE direction)
HOMING DIRECTION = Under the Z column it is set to +(M92) (This tells the control to seek the Z axhis home/limit by moving in the POSITIVE direction)
(Homing direction also creates your CNCM.HOM file, when you WRITE SETTINGS TO CNC CONTROL, this file is what the machine uses to seek home switches when you press CYCLE START on Power up)
Homing Sequence X=3, Y=2, Z=1 (The control will seek Z axis home switch first, then Y axis home switch, then X axis home switch)
Travel Limit(+) This tells the control how far in the POSITIVE direction there is in axis travel. This sets the soft limit. SO, if we have a home/limit switch at -X, then the machine in this example can travel 6.2" in the POSITIVE direction before it hits its soft limit.
For Y in this example, since we have a home/limit switch at -Y, then the machine in this example can travel 5" in the POSITIVE direction before it hits its soft limit.
For Z in this example, since we have a home/Limit switch at +Z, then the machine in this example can travel -4" in the NEGATIVE direction before it hits its soft limit.
PLEASE NOTE, if your machine moves in the -NEGATIVE direction, you must put the - in front of the distance traveled number, (-4 in this example)
If you don't setup home/limits correctly your machine will not move correctly.