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Author Topic: What software are poeple using to get form gearotic to print  (Read 7579 times)
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Gavin
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« on: January 20, 2013, 02:15:36 AM »

Hello,
I'm wanting to create gears in gearotic, modify hubs and shafts in some cad program, then export to stl to be slic3d up.
What I thought would be trivial is turning out to be very difficult

Can someone let me know how they do it.

Thanks.
Gavin.
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ArtF
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« Reply #1 on: January 20, 2013, 08:39:28 AM »

Gavin:

   The creation of the dxf's is easy. I too use CAD to modify my dxf's for the use I need of my gears. However, getting an STL from any cad program is
difficult, the DXF is basically a 2d of the gear ( though you can also put out the stl of the original gear but modifying them takes a solids package type
of cad and isnt easy to do), and youd have to extrude the gear back into a solid in order to get stl's with modified hubs and such. Shafts arent really
dealt with in GM at all, the shafts are simply holders so one can visualise how the gears fit and at what centers.
  I am working on ways to get better quality stl's out of the program directly, but the complexit y of that limits what I can do, each person wants something
different from hubs and spoke offsets in terms of a final 3d stl. The STL output from GM is curently pretty limited and can really only output what you see
on the project screen. All the 3d prints Ive seen so far are usually sjust the otput gears themselve s. Your limited to about 100 teeth or so on a gear in stl
in order to preserve the resolutio n without having too high a triangel count.

 Just ask if theres anything I can elaborate on, or if your having trouble with getting the dxf data you need, but the answer to your question about how its done
is actually a very complex one and depends on the solids package your using in attemptin g to modify the gears.

Thanks
Art
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danmauch
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« Reply #2 on: January 20, 2013, 11:52:31 AM »

 I been using Bobcad 24 to take 2d dxf files, modify them and then add  hubs etc to them and then export them as stl files to slic3r.
 But I'm sure there are other cheaper programs .
Dan Mauch

 
Hello,
I'm wanting to create gears in gearotic, modify hubs and shafts in some cad program, then export to stl to be slic3d up.
What I thought would be trivial is turning out to be very difficult

Can someone let me know how they do it.

Thanks.
Gavin.
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Gavin
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« Reply #3 on: January 20, 2013, 06:11:29 PM »

Thankyou both,
The issue I have is that I'm after bevel gears. It seems the stl and 3d dxf are not watertigh t mesh's so I can't easily modify them as solids without allot of work. Spur gears are fine.
I feel unless you develop a full featured solid cad editor for gearotic you would never satisfy everyone. For me my only interest is generatin g the bits of gears I can't understan d the maths for, create the rest in autocad or freecad, then print it out.
I'm hoping someone has done the hard work already.

For me Gearotic dxf/stl -> Autocad 2013 (can't convert to solid)
Gearotic dxf/stl -> Freecad (can't perform Boolean operation s)

I'm sure I'll have another crack at it today.
Thanks
Gavin
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Richard Cullin
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« Reply #4 on: January 21, 2013, 12:11:23 AM »

i have reasonabl e sucess with google sketchup 7 and 8 for 3d bevel/helical gears, i find that using the rubber eraser tool to remove the top and bottom of each gear allows you to create your own hubs easily enough,
the smoothing function also reduces the number or triangles if things get too slow , used judiciuou sly of course,
slicr3 has no trouble producing a 3d print,from the stl's so produced
netfabb studio can fix some other issues,use the simple repair option
for spur gears i just import the 2d dfx into sketchup.
another tip with sketchup is to import a mm scaled object (dfx,stl) as inch then scale it back to mm when you have finished modifing it
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Gavin
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« Reply #5 on: January 21, 2013, 03:16:16 AM »

Thanks, I may try sketchup however today I  found a solution. I create my gears with an oversized shaft, export from gearotic as stl (because 3d dxf is very slow to process),and open in freecad. I then create my own solid to fill in the hole. From there I am good as long as I don't need to edit gearotic mesh.
Printed a test today.
http://Http://users.tpg.com.au/gbung3/bev.jpg
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Gavin
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« Reply #6 on: January 31, 2013, 03:57:40 AM »

Just an update.
I currently rely on netfab cloud service to repair my gearotic stls. Hopefully their service remains free or I will be in trouble.
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ArtF
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« Reply #7 on: January 31, 2013, 11:04:17 AM »

Gavin:

  I suspect they will remain free. However, at the moment Im doing a great deal of research on
that very topic. Its a very complex world, but Im intereste d in just how much power I can add
to the 3d models. Once, the 3d models were really only for show. The ability to put out a 3d dxf or
STL was just a very unimporta nt sideline, BUT  the numbers of letters and comments on 3d underscor e
their importanc e in a world about to be hit with 3d printers on a massive scale.  I figure I have a year or
so till I must have a better and more accurate 3d modeling structure .
   I appreciat e everyones patience on that issue, GM wasnt meant to be a 3d modeling package, but
Im certainly not opposed to going there. So expect me to be slow on future features till my research is
complete on 3d triangula tion and simulatio n codeing. In the end I hope to be able to put out 3d gearing
and mechanism models second to none. At the moment we are pretty rough as gears are not easy to
do in 3d with present code. Ill post periodica lly on where my research is taking me, when its this deep
and Im losing weeks of sleep thinking about variosu issues, it usually leads to something pretty cool...
usually.. .lol

Thx

Art
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Gavin
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« Reply #8 on: February 01, 2013, 10:46:58 AM »

Output to an open cad standard would be great as I could edit it directly with software like freecad.
I feel I've gotten good value from the software already and will be happy whenever there is any updates. For me I was supprised I couldn't find another bit of software to allow easy creation of 3d cad gears. In fact I somehow read the website, trailed the software, and purchased it believing its primary function was as a 3d modeler.  I must read a bit more of this forum, I'm guessing you use this to output directly to some sort of milling machine.
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ArtF
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« Reply #9 on: February 01, 2013, 10:55:32 AM »

Gavin:

  Actually, I use it mainly for dxf output myself, and I postproce ss in programs like Vectric , though I often just use the Gcode output as well. Its the 3d models that arent as good as Id like, though many use them for 3d printing, the resolutio n suffers above a certain tooth count.

  But like all things in CAD, the problems come in when one program doesnt recognise another's format, and DXF is very well known as being troubleso me as are stl and any 3d model. Triangula tion standards vary between various software programs.  Hopefully, youll see better and better output as time rolls along.

Art
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ftkalcevic
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« Reply #10 on: March 25, 2013, 04:01:11 PM »

I just tried InStep, http://www.solveering.com/instep.html, which can convert stl to step.  The plan was to use it to import into alibre design, but alibre choked on it because it was a 30MB file.  I tried a smaller file (I used wings3d to slice out 1 tooth), and that worked fine. 

Alibre can export stl, which I then use in slic3r.
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Joseph Ellison
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« Reply #11 on: May 24, 2013, 04:27:32 AM »

I am using the latest betas, Gearotic and Moi3d Ver3 Beta. Moi3d Ver 2 does not have DXF export AFAIK.

I usually output from Gearotic as 2d dxf with the backplate, don't bother about spokes or worry too much about shaft size.

I either open or import into Moi3d, then join if needed, (highlight the gear and click on Join Icon as I find that the spur gears with more teeth require a join), draw spokes, and shafts, then extrude, and build the rest of the mechanism and output either as 2d dxf for cnc or as an STL for 3D printer.

More steps are required to output 2D dxf from Moi as I usually disassemb le the 3D model lay the parts down flat on the XY plane and align to a common base line before outputtin g the file.
Having done this for a while now, I don't regard it as a hassle as I can draw a rectangle the size of my spoil board and arrange the parts quite easier than doing it in VCarve pro.

In Vcarve I do have to remember to check for open sectors, and also convert to curves as VCarve may see the curves as straight line segments. Also when I go from GM straight to VCarve, just in case.

STL exported from Moi3d does not have to be repositio ned before export as the 3d printer software (Up Mini) can rotate the part easily to put the best side up for printing providing that the exported parts are aligned on the XYZ axes, on the odd occasion I have a funky angle it isn't too much hassle to align the part in either Moi3d or using the printer software.
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Gavin
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« Reply #12 on: July 05, 2013, 10:01:20 AM »

I'm still having trouble editing my bevil gears in autocad.
I notice on the main page of the gearotic website that it will do 3d solids for various CAD.

What CAD program do I need to use to work on a bevel gear created in gearotic.

Is it a feature of the latest dev version?
Currently if I export to 3d dxf I do not get a 3d solid but a mesh that can't be converted to solid for solid editing or exporting to stl.

At the moment I'm having to create my gears in gearotic, print them, then glue them to my model.
I'd prefer to create in gearotic, export to dxf solid, edit in autocad and export to stl from there.

Is this possible?
I'm stuck with DXF as long as I stick with AutoCAD Sad

Thanks,
Gavin.
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ArtF
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« Reply #13 on: July 05, 2013, 10:49:20 AM »

Gavin:

    GM always used surface modeling to do its 3d models. But the differenc es between surface models and solids are a
matter of process. Its what makes it so difficult . That having been said, GM's 3d models of bevels are bad, they are unclosed and
not appropria te to convert to a solid, GT's output of the same bevel IS closed and convertab le to a solid. ( I'm not aware of the best way to do that as I dont yet do much with solids, though that will likely change). So try to load your bevel into GT, then export the STL from there.
Since the stl will then be a closed manifold surface it should be the best model to work with and give you the best chance of success at whatever modificat ion your attemptin g.

   Some have requested other CAD output formats so the object could be put out as a solid directly. The problem Im having is the
standards to do that dont really exist other than to purchase an expensive file conversio n utility. So until I release the new software in
September/Oct timeframe, use GT to make STL's of the bevels, then see what your CAD will do with those, its the best shot you have.
 When the new software is released, it wont solve this issue, but I am willing at that point to put a great deal of resources towards further
output types for solids as well as many other features that have been requested . I must admit I never figured the 3d models would become important, GM was meant to make simple 3d models like gears,pulleys and such but it seems when I added Bevels, I opened a large doorway to incredibl e complexit y in dealing with true 3d models as opposed to 2.5D based 3d models that are much easier to deal with
in terms of CAD remodific ation.


Thx
Art
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Gavin
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« Reply #14 on: July 07, 2013, 12:09:43 PM »

I create a spur gear with no spokes, open it in GT and export it to STL.
This STL is not convertib le to a solid in AutoCAD 2013/SketchUpMake etc.
I must run this STL through netfab and then I can import it into SketchUpM ake  and use solid editing on it.
If I export this to DXF It is still not convertib le to a solid in autocad 2013

Just hoping someone here finds a solution at some point to go from gearotic to editable solid with a bit more ease.
I have found this far that is is possible with the following:
GM>STL>GT>STL>netfabb>SketchUpM ake(with stl plugin installed)

Thanks.
Gavin.
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