3D printing press brakes

3D Printing
21

Just came across this in my email:

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I saw that too, but Anthony was faster :wink:
It looks like the author is using an aluminium block for the lower part.

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23

Yeah, dies are easier because fewer constraints on anvil width, I think. A vice wasn’t designed specifically to be a brake. :slight_smile:

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@mcdanlj
Have you seen this?

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I saw the headline and had it on my list to watch after work. :slight_smile:

His are probably a better design.

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Not much to add, just that this was really interesting to read.

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I will say, on reflection, that I think he makes two mistakes with the magnets:

  1. I don’t think that the magnets against the vice faces are actually necessary; so they just add complexity and cost and reduce strength without benefit
  2. The magnets on top look like they have a substantial amount of plastic between the magnet and the vice. Those inverse exponential terms really bite! This is why I experimented with the minimum amount of plastic I could leave under the magnet and still hold the parts to the vice. That substantially reduces the size of magnet needed. (What’s the equation for magnetic force between a permanent magnet and an induced magnet? I vaguely recall it having more terms in it than I naïvely expected, which isn’t saying much…)

Ultimately, it makes me think about modeling a gooseneck that isn’t a finger die. I’ll look at MRs in gitlab if anyone wants to experiment with me on this one.

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28

One thing I have found useful on these sort of prints is to model a tiny pinholes or slits near areas of stress concentration so it forces the slicer extra perimeters only in those areas for strength.

I’m up for playing around if you got some ideas of what you want to model.

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I printed mostly solid; I don’t remember how many perimeters, but I think I used 90⁰ rectilinear infill at 90-100%. I just pushed an update that adds a groove to wrap spectra around the anvil after printing. I haven’t tested this yet. It’s .75mm deep and 1.5mm wide. I am having trouble finding a reference for the strength of spectra line by cross-sectional area, so I don’t know what 1.125mm² of spectra will do; it was just a wild guess based on using probably less than that to sew hammock straps that have held up three people sitting in a single hammock. :roll_eyes:

Here’s the STL

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Via HAD:

31

Saw that. 5 tons is impressive.

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Interesting, wouldn’t have thought the lateral compression would have helped that much.

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Though, I guess it depends on how it was printed.