Linuxcnc Press brake - Open Source

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28 Oct 2020 04:49 #187501 by aleksamc
As example Autonics sensors
VF-M10 or easier to install VF-RM5 that work with reflector mirror.
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28 Oct 2020 05:12 #187510 by pinder

As example Autonics sensors
VF-M10 or easier to install VF-RM5 that work with reflector mirror.

Thankyou.
I'll keep that in mind

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28 Oct 2020 13:31 - 28 Oct 2020 13:32 #187565 by andypugh
I nearly made a GUI for a bender once:
forum.linuxcnc.org/38-general-linuxcnc-q...ideas?start=10#82686
It was for tube, but the same idea would work for a press brake.
Basically, no G-code, just a bend table.

Also, this video shows a rather nicely made brake. Probably worth a watch for inspiration:



But for a CNC brake I would very much suggest dispensing with all fancy linkages and using two separate cylinders synchronised by software.
This does require proportional hydraulic control valves, but maybe something cheaper than a full-on Moog Valve is usable.
Though it is possible to achieve simultaneous movement by other means:



is a particularly fine example.
A master cylinder operates a stack of sub-masters which each operate one slave cylinder.
Last edit: 28 Oct 2020 13:32 by andypugh.
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28 Oct 2020 14:44 #187581 by pinder



A really neat design for a press.
Thankyou for sharing

Cheers,
Pinder

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28 Oct 2020 20:04 #187614 by rodw
If you roll up to the diagram I posted you will see that the distance travelled by the Y axis that does the folding is set by a simple limit switch. A servo and ballscrew carrying a limit switch engages with an angled striker plate. There is not really any need to control pressure. Don't over think it.
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28 Oct 2020 21:33 #187635 by andypugh
I wasn't talking in terms of controlling pressure, I was considering ways to make a mechanically very simple brake (two hydraulic cylinders, no mechanical linkage between the two) and synchronising them with software (because that is the sort of thing we do round here)

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28 Oct 2020 22:09 #187641 by tommylight
All of the big ones that i have seen and worked with use 2 big cylinders, one on each side.

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29 Oct 2020 04:33 #187650 by pinder

If you roll up to the diagram I posted you will see that the distance travelled by the Y axis that does the folding is set by a simple limit switch. A servo and ballscrew carrying a limit switch engages with an angled striker plate. There is not really any need to control pressure. Don't over think it.


That diagram was tricky to understand.

But I got the idea.

I think we should pursue with this.
Mounting servo mechanism vertically or horizontally, We'll see that in design.

So,
we set y distance by limit+ ballscrew combo, on both ends.

Two cylinders on both ends, controlled separately.

We push pedal and both cylinders push until limit is pressed.
example:-
Both cylinders start pushing.
if left side limit is pressed first, left cylinder stop pushing, and right cylinder also pushes till limit triggering.

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29 Oct 2020 11:59 #187675 by andypugh
I think that there is a good argument for position feedback at each cylinder location. Maybe draw-wire encoders?
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29 Oct 2020 15:59 #187695 by pinder

I think that there is a good argument for position feedback at each cylinder location. Maybe draw-wire encoders?


if we'd go that route, simple linear scales would be easier and readily available option.

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