Homebrew PCBs

On Tue, 28 Jun 2005 00:17:05 +0200, David McNab <david@...>  
wrote:

>
> If you've got any constructive suggestions for evolving the mechanical
> design to something better, using only easily-available materials and
> non-specialised tools/techniques, I'm all ears.
>

Al on Al bearing will not last, and WD40 will not help 'cause the drilling  
dust will turn it into grinding paste. The electronics are just barely  
moving it, but you kow that already.
I hope the drill is steady enough on this mount not to break drills. I  
hope the X/Y is precise enough height-wise to mill.


>> Also, i didn't quite understand the pic/memory card (?) discussion here,
>> not knowing what on earth one would need that for on a CNC.
> Need and convenience are two different things.
> Makes sense to me for a CNC to have milling jobs stored on it, which can
> be selected via a keypad and LCD interface. That kind of stuff is way
> easier for me than the mech work.
>

If you are Software guys, then why on earth would you even suggest JPEG  
for storing a layout. One would assume you know better as software guys  
not to use a lossy compression meant for photos on line art/ B&W. The  
_only_ image format that would make sense is a lossless one where you can  
put in 2 color and get out 2 color with sharp edges, be it GIF or PNG or a  
non-compressing format like BPM.

Why would anyone want to use a picture as basis for the data when there  
are formats meant for that which the CNC coftware can output? Especially  
with the simplcity of drill files it seems pretty crazy to detect them  
holes from a picture.



>> It sounds all
>> kind of like Software guys gone CNC
> You noticed?
>

I really think you are going a very peculiar route with that CNC.  
Nonetheless i wish you only the best of luck. I just hope it doesn't turn  
out like those fancy, but not functional, webpages that are nowadays made  
by some software guys.

ST