Linuxcnc Press brake - Open Source
28 Oct 2020 04:49 #187501
by aleksamc
Replied by aleksamc on topic Linuxcnc Press brake - Open Source
As example Autonics sensors
VF-M10 or easier to install VF-RM5 that work with reflector mirror.
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
I'll keep that in mind
Replied by pinder on topic Linuxcnc Press brake - Open Source
Thankyou.As example Autonics sensors
VF-M10 or easier to install VF-RM5 that work with reflector mirror.
I'll keep that in mind
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28 Oct 2020 13:31 - 28 Oct 2020 13:32 #187565
by andypugh
Replied by andypugh on topic Linuxcnc Press brake - Open Source
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.
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
Replied by pinder on topic Linuxcnc Press brake - Open Source
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28 Oct 2020 20:04 #187614
by rodw
Replied by rodw on topic Linuxcnc Press brake - Open Source
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
Replied by andypugh on topic Linuxcnc Press brake - Open Source
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
Replied by tommylight on topic Linuxcnc Press brake - Open Source
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
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.
Replied by pinder on topic Linuxcnc Press brake - Open Source
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
Replied by andypugh on topic Linuxcnc Press brake - Open Source
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
if we'd go that route, simple linear scales would be easier and readily available option.
Replied by pinder on topic Linuxcnc Press brake - Open Source
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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