Another plasma component...

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15 May 2019 06:37 - 15 May 2019 06:38 #133820 by phillc54
I wondered why I couldn't see kerfcross-is-locked.
What is your height-per-volt setting?
Could you try kerfcross override at 200%.
It would also be nice to trigger from kerfcross-is-locked and see what is happening when it switches.

Cheers, Phill.
Last edit: 15 May 2019 06:38 by phillc54.

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17 May 2019 09:18 - 18 May 2019 06:15 #134038 by phillc54
I have pushed an update, it is a configurator that will (or should) create a complete plasmac configuration.
It doesn't affect plasmac so if you have a working config then there is no need to update.
I have attached a copy if you would like to try it without updating.

Before running this application you need to have:
1. a working machine config.
2. a local clone of the plasmac repo.

Double click on configurator.py in the configs/sim/gmoccapy/plasmac directory and follow the prompts.
The configurator.py MUST remain in the configs/sim/gmoccapy/plasmac directory so it knows where to copy the plasmac files from.
It creates a sub directory in ~/linuxcnc/configs named {machine_name} and writes a {machine_name}.ini and {machine_name}.hal file in that directory.
I makes a backup copy of the original HAL and INI files in the above folder.
It creates a {machine_name}_connections.hal file for the connections between plasmac and the original config. This moves the connections/comments from plasmac.hal to allow it to be overwritten by an upgrade.It copies all the plasmac application files to the new directory.
It also leaves the original HAL and INI files untouched so they could be changed and the configurator could be run to rebuild the config.
It shows only the relevant HAL connections for the selected mode.

It can also be used to upgrade an existing config, although it probably shouldn't be used to update a config that wasn't built by the configurator.

Cheers, Phill.

Mode0
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Last edit: 18 May 2019 06:15 by phillc54.
The following user(s) said Thank You: billykid, islander261, thefabricator03

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18 May 2019 07:07 #134107 by phillc54
I pushed another update, just some enhancements and code cleaning for the configurator.
To aid the configurator I have changed the layout of plasmac.hal. There are no code changes, just layout and comment changes plus additional comments in the ini files.

Cheers, Phill.
The following user(s) said Thank You: tommylight

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19 May 2019 10:36 - 19 May 2019 10:37 #134259 by rodw
Replied by rodw on topic Another plasma component...
Tommy laid down a challenge! Time for a bit of fun!

I know we discussed it on another thread but I managed to spreadsheet a mathematical model shared with me by Dewey Garret who wrote the external offsets branch we use that now calculates the maximum velocity and acceleration the Z axis needs to cut corrugated iron. So lets look at the specs first.

Aussie Corrugated iron measures 76mm peak to peak and is 17mm high from the lowest to the highest and its 0.48mm thick.

So lets look at the cut charts. The lowest they go is 1mm at 3266 mm/sec at 40 amps. At a guess, if I drop it to 30 amps, the cutting speed might be around 4000-4500 m/min

So what I'd like to understand is how much of the raw Z axis velocity and acceleration does plasmac allow us to use for torch height control? So looking at my ini file I settled on a max velocity of 60mm/sec and 700 mm/sec/sec max acceleration

So if I run it at 4300mm/min, Dewey's model says I need a max velocity of 50mm/sec (3000mm/min) and an acceleration of 430mm /sec/sec. The acceleration seems well within spec and hat gives us about 17% headroom on the velocity.

So Phill, can Plasmac achieve those speeds on my machine and how should we set the machine to manage it? If not, what is the maximum cut velocity should I use? This test is what really will put plasmac on the map.
Last edit: 19 May 2019 10:37 by rodw.
The following user(s) said Thank You: thefabricator03

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