Homebrew PCBs

Baxter,
Not sure what RPM the motor is running but its fairly fast.  I control the speed by modulating the power button with my finger. Guess I need to figure out how to measure it. 

You want to get the aluminum disk centered as much as possible.  That issue came up when I went to attach the disk to the hub. How the devel am I going to get it centered? I couldn't see the hub and I had forgotten to drill a center hole in the disk while I was cutting it out on the lathe.  I mixed up the JB-Weld and coated the top of the fan hub centering the disk by eye. Then I fixed a pencil to the box with some tape as a guide with the point close to the edge of the disk. Rotating the disk and hub by hand I was able to get the disk centered quite well, it runs nice and smooth with only a hint of vibration at full speed.  The blank PCB is going to unbalance everything anyway. Did a lot of boards on my old spinner years back and almost never had a board fly off.  Its a good idea to spin it up before you put on the resist just to test your positioning.

--- In Homebrew_PCBs@yahoogroups.com, "bebx2000" <bebx2000@...> wrote:
>
> 
> 
> I second the comment: "nice job". I have a  couple of questions.
> 
> 	1. What is the rpm of the motor?
> 	2. Is the centering or balance of the aluminum disk critical?.
> 
> Baxter
> 
> 
> --- In Homebrew_PCBs@yahoogroups.com, "designer_craig" <cs6061@> wrote:
> >
> > 
> > I just finished up my new photo resist spinner.
> >
>