CNC?
October 07, 2008 07:08PM
Hey, assuming that I had access to a CNC mill, could I fab my parts from chunks of plastic with that? Thanks
Re: CNC?
October 07, 2008 08:36PM
Yeah, Nophead has done that and I'm doing pretty much the same thing these days.

Check out his blog at

[hydraraptor.blogspot.com]
Re: CNC?
October 07, 2008 08:43PM
Thanks, that's make it a lot easier for me to get the parts made.
Re: CNC?
October 08, 2008 02:42AM
Sorry to disagree, the answer is no, you can certainly make a 3 axis CNC positioning system as Forrest & Nophead have done but they are not Darwin repstraps, the Darwin design cannot as standard be made in a conventional machine shop the BfB design and the Ponoko design could both be cut in a mchine shop but would probably be cheaper laser cut unless you have cheap access to the machine shop.


Ian
[www.bitsfrombytes.com]
Re: CNC?
October 08, 2008 06:27AM
Ian Adkins Wrote:
-------------------------------------------------------
> Sorry to disagree, the answer is no, you can
> certainly make a 3 axis CNC positioning system as
> Forrest & Nophead have done but they are not
> Darwin repstraps, the Darwin design cannot as
> standard be made in a conventional machine shop
> the BfB design and the Ponoko design could both be
> cut in a mchine shop but would probably be cheaper
> laser cut unless you have cheap access to the
> machine shop.
>
I guess I don't understand the distinction that you're making, Ian. Nop is making Darwin parts on his Repstrap and I could, too, if I wanted to. It seems to me that there is no such thing as a "Darwin Repstrap", only Repstraps.
Re: CNC?
October 08, 2008 08:07AM
If you have a milling machine and a lathe you can make an extruder. You can then attach the extruder to the milling machine and make all the rest of the Darwin parts. That is what I have done.


[www.hydraraptor.blogspot.com]
Re: CNC?
October 08, 2008 03:10PM
The point i was making is you can make all the BfB parts on a machine once it has been made as in make a complete set of spares for it just as with a Darwin so rather than print out another design you can print a copy of the original laser design.


Ian
[www.bitsfrombytes.com]
Re: CNC?
October 08, 2008 03:21PM
I guess I still don't "get it". confused smiley
sid
Re: CNC?
October 08, 2008 07:27PM
As far as I understood Ian is talking about let's say the cornerblocks of the "official" darwin, due to their shape and inner holes they're not machinable with a standard mill, not even in full 3d.

What IS possible indeed is to MILL an extruder (well the parts for an extruder of xourse) and then use the cnc as a cartesian for EXTRUDING the rest of the machine (cornerblocks winking smiley)

Or am I wrong now?

'sid
Re: CNC?
October 08, 2008 07:32PM
The corner blocks are complex because they have captive nuts, but that is only because you can't put set screws into plastic. If you make them out of metal you can just tap holes. That makes then just blocks with lots of holes drilled though them, some of them tapped. I think there is even a pdf with drawings in the Darwin cartbot release on Sourceforge.


[www.hydraraptor.blogspot.com]
Re: CNC?
October 08, 2008 08:04PM
MY Son and I were able to make a machine by reading off of the STL drawings?

[repstrapping.blogspot.com]

granted there are some things I would have done differently.

We have been working on other parts of Reprap for the time being so we have not printed much lately ( we need to finish since we are about 1/2 way to a printed machine. )

I have some drawings of most of the parts just send me a personal email from the forum carpenma.

Oh and by the way, we used a scroll saw and a drill press to make all of the parts. My goal was to be able to make a Repstrap with common tools.


Bruce and Nick Wattendorf
Re: CNC?
October 08, 2008 09:37PM
Sounds neat. Ya, if you don't mind, those drawings would be a big help.
Re: CNC?
October 10, 2008 11:03AM
If you can upload the PDF files it would be a great help particularly the extruder parts.

Many thanks


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