The Gast rotary vane vac pump I have says "use no oil" on it.

The dental handpieces won't eject oil, I'm fairly sure of that.  That 
would annoy patients.  But, it might have a return line.  Actually... 
yeah, it has to have a return line because otherwise I would have 
remembered getting brushed by a high speed exhaust flow when getting 
worked on.  I recall the noise but not that.  Not unless they dissipated 
and redirected the flow really well.

Danny

Luis Moreira wrote:
> We recently did just that.
> I needed to do some measurements at 130KV potential and after looking at
> some solutions, we decided to use a die grinder attached to a 3 phase
> motor similar to the ones used for driving hard drives and such. We also
> tried a brushed DC motor but that was not so good.
> We manage to get around 14V DC (after rectification) @ 1A, and it worked
> very well. But like some pointed out lubrication is an issue, not only
> because it requires it but also this tools have no return pipe hence you
> can end up with everything covered in oil. The other issue we found was
> vibration. As this was a temporary setup for us, the motor to grinder
> coupling was made directly, After running it for 4 hours continuously
> the system stopped. At first we tough that the grinder seized but
> actually it was the motor that do to the vibration damaged one of the
> windings.
> Most of all what we found, specially when we first tried the system with
> the DC brushed motor, is that the choice and combination of air motor
> and motor( as a Generator) is very important. Specially the RPM
> required/supplied and torque. 
>
> Best Regards
> 		Luis
>
>      
>
>   

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