Homebrew PCBs

Stefan Trethan wrote:

>On Tue, 20 Dec 2005 02:14:57 +0100, Alan King <alan@...> wrote:
>
>  
>
>>Alan
>>    
>>
>
>
>I will try your method with watching the tiny bit flex, i have plenty of  
>those to break.
>
>ST
>
>  
>

  Hey great, another critical eye on it.  First, loosen everything in 
the axis a little, and totally realign it as best you can with a 24 or 
30 range bit.  Get it so there's no visible vibration or wobble.   Then 
chuck the 80 and see what you think.  I'm curious if your estimate of 
the initial alignment is as bad as mine after seeing what the 80 size 
does right after..

  You could actually hit on near perfect, even with still bad error in 
the general alignment, just by chance.  Or get much closer with 
different tools.  But I've never been that lucky, and it's even hard to 
move one end of the drill in small enough motions to get it good for the 
80's.  Usually takes 8-10 tries before I get it tightened back up and 
keeping the alignment I wanted..  Need to make a better screw type fine 
adjuster, but even 10 tries or more is quick enough that I haven't 
bothered.  One of the things to look at though for rebuilding the CNC, 
would be nice to have one end of the drill have X and Y adjustments (or 
maybe one on each end for simplicity of the adjuster) and be able to do 
very precise adjustments.  Right now it is just oversize holes with 
screws and nuts, and tweak around and tighten and hope it stays right 
and check after..

Alan