Homebrew PCBs

Okay, Now you are just talking stupid.  The reason you would bet the 
farm that you don't have to bet, is that you don't know what you are 
talking about. Manual mills may have upwards of .100" backlash.  

Industrial CNC machines (and most hobbiest CNC machines) that use ball 
screws have less than .002" backlash on the screws.  An even greater 
majority of precision metalworking machinery (industrial machine 
tools) have less than .0006" of backlash.  Most machine tools using 
ball screws go so far as to even put two nuts on with a tab between 
them to further eliminate backlash to near zero (usually .0002" or 
less).  When a machine tool get's excesive mechanical backlash, you 
would adjust the two ball nuts to remove it, the software compensation 
is only there to take care of .0003" or so.

Now drop this discussion and quit demonstrating your ignorance on the 
subject mater.






 
> I'm willing to bet the farm (if I had one) that more than 50% of all 
> industrial CNC setups have backlash > 10 thou. Either because 
greater 
> accuracy was never required or due to lack of maintenance. Whatever, 
> provided the end product isn't being impacted, nobody cares. Search