[Emc-users] OT: Waterjet cutter

[Roland Jollivet]

Hi All

I came across this video of a home-brew waterjet cutter. I don't know if
this guy is on this forum, or if this was posted before, but;

here is quite an interesting video

on a home made water-jet
cutter.
It's a pity he does not give more data on pressure/cutting speed for
various materials, including steel.

http://youtu.be/Lg__B6Ca3jc

Roland

[Danny Miller]

There was a kickstarter for the "Wazer", a home/low-end waterjet cutter.

Problem is, it is very slow and consumes a LOT of expensive abrasive
media per inch, relative to a full-size waterjet.

A waterjet's key component is the intensifier pump- it is FAR larger
than a pressure washer.

Now, granted, IMHO there IS a solid niche for a slower waterjet cutter
if the cost and facility requirements are much lower.

But the key is being efficient with the abrasive consumption, on a
per-inch basis. So far, "not good".

Though you might think "I'll just buy blasting sand and use that",
sorry, it's my understanding this won't work.

Unless someone DOES invent a low-end waterjet that just uses blasting
sand, in which case, "f'ing A, man!" Yes, that would be a game-changer,
but the market already moved away from sand as basically useless long
ago so you'd have to have some new, overlooked tech never thought of to
change that game.

http://www.thefabricator.com/article/waterjetcutting/selecting-the-right-waterjet-abrasive

Currently the standard media is almandine garnet particles. They have
the hardness, toughness, density, and consistent particle size to do the
job.

Danny

Post by Roland Jollivet
Hi All
I came across this video of a home-brew waterjet cutter. I don't know if
this guy is on this forum, or if this was posted before, but;
here is quite an interesting video
http://youtu.be/Lg__B6Ca3jc on a home made water-jet
cutter.
It's a pity he does not give more data on pressure/cutting speed for
various materials, including steel.
http://youtu.be/Lg__B6Ca3jc
Roland
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[hubert]

Just checking, It seems unusual not to have any posts in this long a
period. My last received post was 6/17/17, 12:27 PM

[Kurt Jacobson]

I was thinking the same thing. It's very unusual for this list to be so
quiet.

Kurt Jacobson
505-303-1933
Sent from Mobile

Post by hubert
Just checking, It seems unusual not to have any posts in this long a
period. My last received post was 6/17/17, 12:27 PM
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[Bertho Stultiens]

Post by hubert
Just checking, It seems unusual not to have any posts in this long a
period. My last received post was 6/17/17, 12:27 PM

Seems right... No news is good news ;-)

[David Berndt]

Everyone gave up and moved to machinekit...

Post by hubert
Just checking, It seems unusual not to have any posts in this long a
period. My last received post was 6/17/17, 12:27 PM
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[Erik Christiansen]

Just checking, It seems unusual not to have any posts in this long a period.
My last received post was 6/17/17, 12:27 PM

IIRC, there is usually a bit of a lull in the northern hemisphere
summer. My guess is that there's been a bit of sunny weather, and
everyone's out behind or on a mower. (That or down at the beach.)

Not so down under. I'm off to the farm for another load of firewood
tomorrow. The chainsaws are already sharpened. Will have to turf out the
27 year old wood heater, though. It doesn't heat as well since the
baffle plate rolled itself up after I ran it hard during a cold spell.

Incidentally, I've found that the Postscript printer language is sorta
almost like gcode on steroids. Fighting with a GUI drawing package
gives me chest pains, without producing useful output, so I've just
finished drawing floorplans, elevations, sections, and started the site
plan for a new build, with all text input. (800 lines for 8 engineering
drawings for submission to the local council.)

Erik

[Jon Elson]

Post by Erik Christiansen
Incidentally, I've found that the Postscript printer
language is sorta almost like gcode on steroids. Fighting
with a GUI drawing package gives me chest pains, without
producing useful output, so I've just finished drawing
floorplans, elevations, sections, and started the site
plan for a new build, with all text input. (800 lines for
8 engineering drawings for submission to the local council.)

Don Lancaster wrote a couple books on PostScript. One is "A
PostScript Cookbook". Maybe the other was actually a series
of magazine articles, "PostScript as a programming
language". Very useful stuff to know.

I do some mechanical drawings in my PC board design package.
Mostly, because I know it very well.

Jon

[Erik Christiansen]

Post by Erik Christiansen
Incidentally, I've found that the Postscript printer language is sorta
almost like gcode on steroids. Fighting with a GUI drawing package gives
me chest pains, without producing useful output, so I've just finished
drawing floorplans, elevations, sections, and started the site plan for
a new build, with all text input. (800 lines for 8 engineering drawings
for submission to the local council.)

Don Lancaster wrote a couple books on PostScript. One is "A PostScript
Cookbook". Maybe the other was actually a series of magazine articles,
"PostScript as a programming language". Very useful stuff to know.

The only dead-tree book I have is "Postscript Language reference, third
edition." Much good info came from BLUEBOOK.PDF, found on the
intertubes. This is my first foray into Postscript, so a steep learning
curve. Rewarding though, because each lesson learned amplifies the
horsepower applied to the next challenge. Making e.g. a simple double
glazed window function, taking length & wall thickness arguments, meant I
only ever had to think once how to draw a window. Adding a "flip"
allowed the dimension text, also taken from the arguments, to be always
the right way up.

I do some mechanical drawings in my PC board design package. Mostly, because
I know it very well.

I'm beginning to see why you would. I computed truss length as wall
length (computed from wall segments + window lengths) + eave + porch,
and used that in the corresponding cross-section. When I changed one of
the components in the floorplan, the truss niftily redrew itself to the
new dimensions, but left the veranda posts behind - because I'd not used
the variables to fix their position. Manual drawing would not have found
that error for me.

One thing I didn't find in the books was how to set a variable to a
computed value - all the examples were just setting it to a constant.
A little bit of experimentation revealed that an exch did the trick.
(I'm still not clear on precisely what that's doing inside Postscript.)

Erik

[andy pugh]

Post by Erik Christiansen
Incidentally, I've found that the Postscript printer language is sorta
almost like gcode on steroids. Fighting with a GUI drawing package
gives me chest pains, without producing useful output,

Have you seen OpenSCAD? 3D CAD at the command line.

An example usage:

[theman whosoldtheworld]

She looks a bit slow ... but she has many other qualities

bkt

Post by andy pugh

Post by Erik Christiansen
Incidentally, I've found that the Postscript printer language is sorta
almost like gcode on steroids. Fighting with a GUI drawing package
gives me chest pains, without producing useful output,

Have you seen OpenSCAD? 3D CAD at the command line.
An example usage: http://youtu.be/IPtF5c8o-10
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916
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[Erik Christiansen]

Sorry for the late reply - just back from a week on the farm. (Soil test
done, so foundation & slab design can now go ahead.)

Post by andy pugh

Post by Erik Christiansen
Incidentally, I've found that the Postscript printer language is sorta
almost like gcode on steroids. Fighting with a GUI drawing package
gives me chest pains, without producing useful output,

Have you seen OpenSCAD? 3D CAD at the command line.
An example usage: http://youtu.be/IPtF5c8o-10

Nooo, heard the name, but never seen it before. It is clearly much more
powerful, as it handles 3D - very nice. (Assuming the "Open" means it
runs on linux.) Fortunately, there's not a lot lost in this particular
use case, as floorplans, elevations, sections, and site plan are all 2D.
However, I have had to explicitly define variables, as described
upthread, to automate transfer of e.g. truss length from floorplan to
sectioned elevation. (So, yes, using Postscript is a hack.)

Postscript is quite efficient, though, as I've produced 8 drawings with
798 lines of text. And there's a lot of detail in the floorplan, and a
reasonable amount in the sections.

The drawings are all done, except for some details on the site plan, so
I've missed the boat for drawing it all in OpenSCAD. What I will do is
look at that for 3D design, once I've built and the mill & lathe are in
their new home. (Off-grid, solar powered, maybe with a 10 kWh
Zinc-Bromine flow battery for filling in during clouds, and for
evenings. Hopefully the price will diminish a little bit in the next 18
months. Down under, it's the northern roof plane which will carry the 6
to 7 kw PV array.)

Erik

[Ralph Stirling]

You would not want to do houseplans in Openscad. It has no provisions for making 2d views or projections, and no provision for dimension lines or text.

I use Openscad quite a bit for parts I will 3d print. Sometimes I create by basic part geometry in Openscad, the import it into Freecad (the only other tool that can use ,scad files) and apply fillets or other niceties that are difficult in Openscad. Freecad has python scripting, so you could "program" a part. It also has some capability for 2d views with dimensioning, although it is very much a work in progress.

-- Ralph

On Jun 27, 2017 11:54 PM, Erik Christiansen <***@internode.on.net> wrote:
Sorry for the late reply - just back from a week on the farm. (Soil test
done, so foundation & slab design can now go ahead.)

Post by andy pugh

Post by Erik Christiansen
Incidentally, I've found that the Postscript printer language is sorta
almost like gcode on steroids. Fighting with a GUI drawing package
gives me chest pains, without producing useful output,

Have you seen OpenSCAD? 3D CAD at the command line.
An example usage: http://youtu.be/IPtF5c8o-10

Nooo, heard the name, but never seen it before. It is clearly much more
powerful, as it handles 3D - very nice. (Assuming the "Open" means it
runs on linux.) Fortunately, there's not a lot lost in this particular
use case, as floorplans, elevations, sections, and site plan are all 2D.
However, I have had to explicitly define variables, as described
upthread, to automate transfer of e.g. truss length from floorplan to
sectioned elevation. (So, yes, using Postscript is a hack.)

Postscript is quite efficient, though, as I've produced 8 drawings with
798 lines of text. And there's a lot of detail in the floorplan, and a
reasonable amount in the sections.

The drawings are all done, except for some details on the site plan, so
I've missed the boat for drawing it all in OpenSCAD. What I will do is
look at that for 3D design, once I've built and the mill & lathe are in
their new home. (Off-grid, solar powered, maybe with a 10 kWh
Zinc-Bromine flow battery for filling in during clouds, and for
evenings. Hopefully the price will diminish a little bit in the next 18
months. Down under, it's the northern roof plane which will carry the 6
to 7 kw PV array.)

Erik

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