Pressbrake CNC Control Setup Questions

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16 Aug 2021 23:28 #217925 by andypugh
Can you check the pressure inputs (limit and actual) to the .comp with halmeter to check that they both move, and both have the same units?

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17 Aug 2021 12:05 #217974 by EW_CNC
I checked both pressure inputs with halmeter and they both change.
Max pressure changes with spinbutton change and pressure corresponds with physical pressure gauge on machine.
Pressure is scaled from the analog signal to match PSI reading on gauge.
# ---pressure transducer feedback signals/setup---
net    pressure-fb-raw    hm2_7i97.0.7i87.0.0.analogin0 scale.0.in
net    pressure-fb        scale.0.out pressgui.pressure-gauge press.pressure
net    pressure-max       pressgui.max_pressure-f  press.max-pressure
setp scale.0.gain  600
Down motion does not stop in both lowering and bending status. (When pressure exceeds max pressure).

 

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17 Aug 2021 21:54 - 17 Aug 2021 21:56 #218023 by andypugh
It sort-of works for me, with the system going in to the "Overload" state of the pressure limit is exceeded.

You need something like:
net limit pressgui.max_pressure-f press.max-pressure
net actual pressgui.pressure-gauge press.pressure
in the HAL.

But, also, the logic was a bit wrong. I think that this version is better, but once you have overloaded the system will only retract, it won't let you try again at the same position (unless you select the same bend again in the GUI, at least)
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Last edit: 17 Aug 2021 21:56 by andypugh.

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18 Aug 2021 14:44 #218075 by EW_CNC
Overload works!

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18 Aug 2021 14:54 #218076 by andypugh
Great.
I am still aware that homing needs further thought.

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06 Dec 2021 23:07 #228476 by EW_CNC
Here is an update on my CNC Pressbrake control.
The ram control is working good, I'm using it regularly for bending.
I'll attach my latest files. My pressbrake is set up for imperial units.
The backstop can be jogged, but the homing for the backstop still needs work.
This is a stand-alone setup made possible with the efforts of Andy Pugh's press.comp.
Thanks All!
Screenshot:
 

 

File Attachment:

File Name: Bender120621.tar.gz
File Size:30 KB

 
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The following user(s) said Thank You: tommylight, rodw

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04 Jan 2022 23:20 #230805 by andypugh
Is the backstop homing the same whether it starts on the home switch or off the home switch?

Is there any chance that you can get a Halscope recording of the backstop motion? (I realise that this might be tricky)

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05 Jan 2022 00:50 #230816 by EW_CNC
It's been awhile since I tried homing the backstop.
I'll see if I have time tomorrow to get some halscope readings and some more info on the backstop's motion while homing.

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05 Jan 2022 20:18 #230894 by EW_CNC
The backstop homes, but as it hits the index point it jerks rapidly before it goes to its home search velocity.

I start the control with the backstop close to the point where the home switch drops from high to low so that the encoder count starts close to 0. That way when homing applies the offset, it is minimal. The farther from the homing point, the longer the fast travel is.

I'll try and get a halscope screenshot starting off of the homeswitch.

Halscope screenshot, Starting on home switch:

 
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05 Jan 2022 21:26 #230902 by EW_CNC
Both starting on or off the home switch give the same rapid jerk.

Here is a halscope screenshot starting OFF of the home switch.

 
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