Linuxcnc Press brake - Open Source

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

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

Thankyou.
I'll keep that in mind

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.

andypugh wrote:

A really neat design for a press.
Thankyou for sharing

Cheers,
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.

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)

All of the big ones that i have seen and worked with use 2 big cylinders, one on each side.

rodw wrote: 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.

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

andypugh wrote: 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.