Homebrew PCBs

Bill Blackburn wrote:
> Hi Guys
> 
> For the fellows who are mechanically machining their own PCB's, what is 
> the choice of Spindle Motors?  How do the RotorZip units work for this 
> application compared to using the Dermal units?  I was never very 
> impressed with the bearings in the Dermal Grinders.  They don't seem to 
> last and get loose rather quickly.  Interested in your thoughts on this 
> matter.  Thanks for the help.
> 
> Regards
> 
> Bill 


Dremal's are designed for engraving, grinding and other small low 
precision odd ball jobs. I would suggest you look at industrial "die 
grinders" or otherwise known as "straight grinders". These hand held 
tools are at least fitted with a hardened steel ground collet. For PCB 
work I use a -

http://bosch.cpotools.com/grinders_and_metalworking/die_grinders/1210.html

Although they are over sized for the job, they are relatively cheap (for 
a spindle motor with a true collet) and reliable.