Homebrew PCBs

On Thu, 03 Nov 2005 21:02:13 +0100, Stefan Trethan <stefan_trethan@...>  
wrote:

>
> no, not at all. I chose this setup because there must be a certain
> arm-length to approximate straight movement with a pivoting action. Also,
> in order to minimize sideways play, the bearings must be apart some
> distance. So that more or less gives a minimum size. Also, the bottom
> plate and table was one piece initially, and i only needed one cut on it.
> There is now a neat space under the table for drills, and the hoover
> nozzle is fixed to the arm, as well as a small lamp. Not sure if i add  
> the
> projection mechanism one day.
> ST


Oh, and there's a counterweight at the back to balance the arm neutrally  
now, and a screw parallel to the drill as a stop. I found it helpful  
having the stop actually land on the PCB, it holds it down im just that  
critical moment when the drill breaks through.

I would do some things different now, mainly use a simple flat bottom  
plate, and a triangular pivoting plate, with a piano hinge at the back.  
This would be much stiffer than the open frame i have now.

ST