New Project with Mesa 7I96 and THCAD-05
28 Jun 2021 14:51 #213146
by acourtjester
Replied by acourtjester on topic New Project with Mesa 7I96 and THCAD-05
Thanks Phillc see attached cartoon, I need to move to your side to understand things betterMy problems are due to no experience with linuxcnc, and conflicts between what I could do with Mach and UCCNC software. With Mach and UCCNC I had all the limit/home/floating head switches in series to one pin. The software looked at the operation and would respond to any switch trip (from that pin input) as connected to that operation. This was due to only 5 input pins so the combinations were needed to cover a varied input coverage. It is clear that Linuxcnc has a large group of input and output pins that can be used.It seems that some of the signals need to be addressed by different locations and names to be active. When testing the other day I could see the limit switch changing state in the Hal show, but when I moved the axis and tripped the switch, it did not respond to it. I will be testing more today with the table wired to the controller. Have funTom
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28 Jun 2021 23:35 #213197
by phillc54
Point taken...
Unfortunately I am not really the right person to discuss home/limit switches with. I have never used limit switches with LinuxCNC and the plasma table is the first time I have used home switches. Some here will say that home and limit switches are required, but I have not found that to be the case, although I must admit my lazy self likes the home switches.
I also have no experience with Mach or UCCNC so I cannot make any comparisons.
I would assume that having "all limits plus home" would require all N/C switches connected in series or all N/O switches connected in parallel and going on the fact that you see the state change in HalShow you must have the wiring correct.
Are you able to get the Power button to do the right thing yet? If so when you power up and press "Home All" do all axes move to their correct home position and the DROs all indicate by colour that they are homed?
Replied by phillc54 on topic New Project with Mesa 7I96 and THCAD-05
Unfortunately I am not really the right person to discuss home/limit switches with. I have never used limit switches with LinuxCNC and the plasma table is the first time I have used home switches. Some here will say that home and limit switches are required, but I have not found that to be the case, although I must admit my lazy self likes the home switches.
I also have no experience with Mach or UCCNC so I cannot make any comparisons.
I would assume that having "all limits plus home" would require all N/C switches connected in series or all N/O switches connected in parallel and going on the fact that you see the state change in HalShow you must have the wiring correct.
Are you able to get the Power button to do the right thing yet? If so when you power up and press "Home All" do all axes move to their correct home position and the DROs all indicate by colour that they are homed?
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29 Jun 2021 00:34 #213199
by rodw
Replied by rodw on topic New Project with Mesa 7I96 and THCAD-05
I'm in the other camp and just wired in everything. When I look at the docs
linuxcnc.org/docs/devel/html/config/ini-...#_home_ignore_limits
I think you are better off setting up your system without limit switches and just share the home signal
and use this on all joints in your ini file HOME_IGNORE_LIMITS = YESYou will need to home each joint one at a time in your home sequence.
Otherwise from the link above, you will have to do a fair bit of plumbing in HAL to disconnect the limit switch inputs for the axes that are not being homed. I don't think you are ready for that until you can look at a 6 and see 15
Its probably easier to rewire the home/min limit switch for each joint seperately and used HOME_IGNORE_LIMITS = YES. This lets you home multiple joints at once.
If you have max limit switches, they could be ignored or wired to seperate pins.
Also, life is pretty easier if you stop using PNCCONF at this point and edit your hal and ini files with a text editor by hand.
linuxcnc.org/docs/devel/html/config/ini-...#_home_ignore_limits
I think you are better off setting up your system without limit switches and just share the home signal
and use this on all joints in your ini file HOME_IGNORE_LIMITS = YESYou will need to home each joint one at a time in your home sequence.
Otherwise from the link above, you will have to do a fair bit of plumbing in HAL to disconnect the limit switch inputs for the axes that are not being homed. I don't think you are ready for that until you can look at a 6 and see 15
Its probably easier to rewire the home/min limit switch for each joint seperately and used HOME_IGNORE_LIMITS = YES. This lets you home multiple joints at once.
If you have max limit switches, they could be ignored or wired to seperate pins.
Also, life is pretty easier if you stop using PNCCONF at this point and edit your hal and ini files with a text editor by hand.
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29 Jun 2021 09:03 #213220
by rodw
Replied by rodw on topic New Project with Mesa 7I96 and THCAD-05
But if you have a limit switch at the minimum travel end, you also have a home switch.. More on that later
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29 Jun 2021 14:31 #213240
by acourtjester
Replied by acourtjester on topic New Project with Mesa 7I96 and THCAD-05
Short history of what I did and how it looked, this is the switch series I used in the past, not any more.
Here is the pins for the switches due to the lack of input pins.
the BOBs I used before only had 5 input pins, 3 used by the THC, one for home/limits and one for Ohmic sensor.
I need to conform to the pins use by Linuxcnc, and that is in the process at this time.
My setup now has a single switch for each axis, located on the moving parts, there is a switch trip at each end of travel for that axis. PhillC I Understand your position as to using the table I load the material and move the torch/router bit to a starting location and tell it that is X 0.0, Y0.0, and Z 0.0 and hit the go button. As I said the table with the UCCNC software it required you to home the table at the start. But then could be used by moving to the location of 0.0 and starting an operation. The main reason for the limits is safety.
Here is the pins for the switches due to the lack of input pins.
the BOBs I used before only had 5 input pins, 3 used by the THC, one for home/limits and one for Ohmic sensor.
I need to conform to the pins use by Linuxcnc, and that is in the process at this time.
My setup now has a single switch for each axis, located on the moving parts, there is a switch trip at each end of travel for that axis. PhillC I Understand your position as to using the table I load the material and move the torch/router bit to a starting location and tell it that is X 0.0, Y0.0, and Z 0.0 and hit the go button. As I said the table with the UCCNC software it required you to home the table at the start. But then could be used by moving to the location of 0.0 and starting an operation. The main reason for the limits is safety.
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