building a prototype August 13, 2015 01:27PM |
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Re: building a prototype August 26, 2015 11:23AM |
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Re: building a prototype April 26, 2016 12:10PM |
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Re: building a prototype May 09, 2016 06:49PM |
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Re: building a prototype May 10, 2016 08:22AM |
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Re: building a prototype May 12, 2016 04:52AM |
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I have to agree. I've been keeping an eye on this project for about 4 years now and there's very little in the way of a physical prototype.Quote
wogglestick
Honestly though, I'd not expect this team or specific project to produce a working machine any time soon. I've been following them for 3 years now I think, perhaps even longer. I check in every few months at least. In that time they've updated the wiki once and finished the design of a power supply that hasn't been built or tested and is based on a patent from the late 70s.
Re: building a prototype May 12, 2016 05:32AM |
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Re: building a prototype May 12, 2016 11:10PM |
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Re: building a prototype May 13, 2016 02:36AM |
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Re: building a prototype May 16, 2016 05:23AM |
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Re: building a prototype May 16, 2016 09:23AM |
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Re: building a prototype May 16, 2016 05:51PM |
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Re: building a prototype May 17, 2016 03:33AM |
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Re: building a prototype May 17, 2016 06:30AM |
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Quote
VDX
... there are some powders with a metal core and a thin coating of plastic or glass.
The SLS process will only melt the coating, the parts will be later sintered/remelted in an oven with some shrinkage.
Other common metal fabbing methodes are SLS with wax- or plastic powder and then "lost-cast"-moulding with embedding the parts in sand and pouring molten metal into them ...
Re: building a prototype May 17, 2016 06:54AM |
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Re: building a prototype May 17, 2016 08:38AM |
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Re: building a prototype May 17, 2016 08:50AM |
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Quote
- Minimum feature size: 0.1 mm
- Typical tolerance: +/- 0.2 mm (can be improved through machining)"]
Re: building a prototype May 17, 2016 08:56AM |
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Re: building a prototype May 17, 2016 01:25PM |
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Quote
pyrotronics
I'm pretty sure that SLS patent has expired late last year.
Also remember that the E-beam is the cost of the vacuum chamber + pump + power supply. The laser cost would be 200W laser + optics + galvo's + power supply + inert gas chamber.
I would love to use a laser, if we found a dirt cheap way to make a 200 W fiber laser?
Quote
VDX
... another aspect is the overall resolution possible with the different methodes - the smallest spot with a 405nm@500mW-diode (what's more than enough for wax-SLS) is 0.03mm
My last experiments with NdYAG and fiber-lasers with common optical heads gave me a best resolution of 0.02 to 0.03mm ... the smallest spot with a NdYAG-disk-laser and a better optics for the fiber-laser was between 7 and 10 microns, what was good enough, to fuse/melt a 10 micron thick platinum wire to the surface in an additive-wire-melting setup ... but yes, this lasers will be more like 20k€
Now check, which resolutions were common with e-beam-melting -- AFAIK, most of the working (proffesssional) setups states a detail resolution of 2mm!! ... they mill/lathe the parts to the final form ...
Re: building a prototype May 17, 2016 06:02PM |
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Re: building a prototype May 17, 2016 10:40PM |
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Re: building a prototype May 18, 2016 03:36AM |
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Quote
What level of detail can be obtained with DMLS?
DMLS is available in several resolutions. At its highest resolution, the layer thickness is 0.0008” – 0.0012”
and the X/Y resolution is 0.012” – 0.016”.
The minimum hole diameter is 0.035” – 0.045”.
DMLS GENERAL TOLERANCES
Based on historical results (and application dependent) general tolerances for DMLS parts are ±0.005 inch for the first inch
and ±0.002 inch per inch hereafter (±0.2 percent). The finish of DMLS parts as built are 350 Ra – µinch.
Re: building a prototype May 18, 2016 05:10AM |
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Re: building a prototype May 18, 2016 05:47AM |
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Re: building a prototype May 18, 2016 06:05PM |
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Quote
Good to know, thanks! I don't get your second point.
Re: building a prototype May 20, 2016 12:55AM |
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Re: building a prototype May 20, 2016 03:09AM |
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Re: building a prototype May 20, 2016 04:22AM |
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Quote
FRC
Really awesome discussion. Pyrotronics do you think you could build or buy an electron gun system for less than the cost of building or buying a 200w laser? I know SEMs can easily run into the 100k plus range and simply assumed that an electron gun system would register a significant cost as well
Re: building a prototype May 20, 2016 05:23AM |
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Re: building a prototype May 20, 2016 02:10PM |
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