RE: [CAD_CAM_EDM_DRO] milling circuit boards

I milled a couple of boards, it just isn't as good or quick as the process I
use now.
The Kinsten pre sensitised board is cheap, I print my image onto
transparency using my inkjet printer
expose in a $5 rig, dev and etch. A single board takes about 10-15min,
including setup time. If I'm doing a batch I turn on the bubble etcher and
it's much faster.
Then there's the resolution, I use a few PQFP (0.5mm pin spacing) chips.
You're just never gonna do that with a home built router.
PK



_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Dennis Schmitz
Sent: Friday, 6 October 2006 9:38 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] milling circuit boards



Sorry, this isn't an answer, but another question. I think I've read
posts from 2 or 3 people milling circuit boards, or trying to. What's
the cost breakdown? Is it really and truly cheaper to make these
boards after you factor in your time and amortize your equipment?

You can get some pretty good prototype quantity boards from internet
outfits like PCB123 now for very cheap, and if you're running
production, there are plenty of board shops out there all undercutting
each other. Check out the back section of any of the EE mags for a
long list of them.

Even 10 years ago "breadboard" meant giving a hand-drawn circuit to a
tech to solder together with perfboard. Today it means doing a quickie
in Eagle and sending it out to an overnight proto house. It's cheaper
than paying the tech.

So where's the upside? Why bother building a machine for it? (serious
question, not sniping)

This is probably off topic, so feel free to email me directly.

TIP: you always pay for one panel, so lay-up several different ones in
the gerbers. If you have space, there are a bunch of free patterns for
proto-boards available to fill it in.

On 10/5/06, wdavis364 <wdavis@gcecisp. <mailto:wdavis%40gcecisp.com> com>
wrote:

> Shopping around for a router, Some router have 1/4 collets and some
> have 1/4 collets and 1/8 collets. Not knowing much about this, what
> size collet will I would most likely to be using in milling circuit
> boards. Will 1/4 collets handle the very small size drill bits(1/32)?
> Thanks for any advice on this.
> bill
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