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Ah #16 Biz

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FreeThinker:
Hi Again! :D
Just aquick comment to Chris about pcb manufacture.Have you considered a small CNC router? These are normally controled by a stand alone pc (does not need to be very powerful) they take the standard gerber files and convert them to Gcode and can route a 50mm x 50mm (2"x2") in less than 1/2 hour.Check out http://www.machsupport.com/ for some VERY nice software and do a search for cnc routers and check out the specs.This can prove a very cost effective alternative for small quantity boards with a fast turn around requirement.I'm in the process of building one from scrap bits and pieces (ie slides from an old printer and scanner etc) but then I am environmentally friendly (cheap?) :D

ChrisGammell:
Oh heck yes! Those are awesome and we use one at work. But I was using 8 mil spacing parts on the board I was making. In retrospect, I was quite demanding (3 day turn as well).

EEVblog:

--- Quote from: ChrisGammell on November 12, 2010, 02:44:18 am ---Oh heck yes! Those are awesome and we use one at work. But I was using 8 mil spacing parts on the board I was making. In retrospect, I was quite demanding (3 day turn as well).

--- End quote ---

8mil? that's freaking huge.
I used to do 6/6mil at home with laser printed transparencies and positive resist boards.
Problem was your board was 4 layer, not do-able with the basic cnc mill routers.

Dave.

FreeThinker:

--- Quote from: EEVblog on November 12, 2010, 04:26:29 am ---
--- Quote from: ChrisGammell on November 12, 2010, 02:44:18 am ---Oh heck yes! Those are awesome and we use one at work. But I was using 8 mil spacing parts on the board I was making. In retrospect, I was quite demanding (3 day turn as well).

--- End quote ---

8mil? that's freaking huge.
I used to do 6/6mil at home with laser printed transparencies and positive resist boards.
Problem was your board was 4 layer, not do-able with the basic cnc mill routers.

Dave.

--- End quote ---
Hmmm Yes I remembered the 4 layer requirement after I posted and was at work :-\.Still you could try and stick them together and run them through the laminator  ;D.

scrat:
We had a complete high end prototyping line at work: CNC milling with calibration camera (0.1mm min. spacing), a press for multilayer, a reflow oven, stencil frame for solder paste, manual pick&place. It was a huge expense, but we ended using the milling machine only: the oven needed to be calibrated for each board, the stencil required expensive material and the press took a long time, while giving not so good results.
A good feature was the method for vias "metallization", which required some simple tools and a conductive polymer paste.

I think the CNC machine could be worth for a company which makes heavy prototyping, even if it costs a bit!

I'm surprised of the 6/6mils Dave could achieve!

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