Re: [CAD_CAM_EDM_DRO] Leadscrews, PCB router experiment

Hi, i have to agree, my dremmel has .015 looseness so any drill under .05
still makes a .05 hole, even the .013 drill did till it broke. single
bearing and plastic do not a good spindle make. cul brian f.

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, July 23, 2001 1:58 AM
Subject: Re: [CAD_CAM_EDM_DRO] Leadscrews, PCB router experiment


> Alan Marconett KM6VV wrote:
>
> > Hi Jon,
> >
> > I have a 3/8" slab of aluminum, that might have to do for my base. I
> > want to do more then drilling, I want to be able to mill traces as
> > well. I'm planing on using a dremel tool.
>
> We've gone around with this a few times. I don't think the standard
> Dremel moto-tool spindle is good enough for PC board drilling.
> The problem is that you have to hit the 'target' quite accurately, or the
> hole will cut through the side of the pad, rather than through the
> middle, leaving a complete ring of copper around the hole. I even
> have problems on my system, with the air bearing spindle motor,
> high precision ground ballscrews, encoders delivering resolution
> of .00005" (yes that's 50 uInches) and the physical stability of a
> Bridgeport. If you mill the board, then the holes should at least
> line up with the copper, but you still have to deal with alignment on
> the other side, if you do 2-sided boards.
>
> Jon
>
>
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